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<li class="nav-item nav-item-this"><a href="">HLS</a></li>
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<section id="hls">
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<h1>HLS<a class="headerlink" href="#hls" title="Permalink to this headline">¶</a></h1>
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<p>HTTP Live Streaming (also known as HLS) is an HTTP-based media streaming
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communications protocol implemented by Apple Inc. as part of its QuickTime,
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Safari, OS X, and iOS software. It resembles MPEG-DASH in that it works by
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breaking the overall stream into a sequence of small HTTP-based file downloads,
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each download loading one short chunk of an overall potentially unbounded
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transport stream. As the stream is played, the client may select from a number
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of different alternate streams containing the same material encoded at a variety
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of data rates, allowing the streaming session to adapt to the available data
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rate. At the start of the streaming session, HLS downloads an extended M3U
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playlist containing the metadata for the various sub-streams which are
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available.</p>
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<p>Shaka Packager supports HLS content packaging. This tutorial covers HLS
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packaging of VOD content without encryption. For live content packaging, see
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<a class="reference internal" href="live.html"><span class="doc">Live</span></a>; for content encryption, see <a class="reference internal" href="drm.html"><span class="doc">DRM</span></a>; for full documentation,
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see <a class="reference internal" href="../documentation.html"><span class="doc">Packager Documentation</span></a>.</p>
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<section id="synopsis">
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<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ packager <stream_descriptor> ... \
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--hls_master_playlist_output <master_playlist_output_path> \
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[Other HLS options] \
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[Other options, e.g. DRM options, DASH options]
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</pre></div>
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</div>
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<p>See <a class="reference internal" href="#hls-specific-stream-descriptor-fields">HLS specific stream descriptor fields</a> for the available HLS specific
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stream descriptor fields.</p>
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<p>See <a class="reference internal" href="#hls-options">HLS options</a> for the available HLS related options.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>DASH and HLS options can both be specified to output DASH and HLS manifests
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at the same time. Note that it works only for MP4 outputs.</p>
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</div>
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</section>
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<section id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<p>The examples below uses the H264 streams created in <a class="reference internal" href="encoding.html"><span class="doc">Media Encoding</span></a>.</p>
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<ul>
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<li><p>TS output with elementary audio:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ packager \
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'in=h264_baseline_360p_600.mp4,stream=audio,segment_template=audio/$Number$.aac,playlist_name=audio/main.m3u8,hls_group_id=audio,hls_name=ENGLISH' \
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'in=input_text.vtt,stream=text,segment_template=text/$Number$.vtt,playlist_name=text/main.m3u8,hls_group_id=text,hls_name=ENGLISH' \
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'in=h264_baseline_360p_600.mp4,stream=video,segment_template=h264_360p/$Number$.ts,playlist_name=h264_360p/main.m3u8,iframe_playlist_name=h264_360p/iframe.m3u8' \
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'in=h264_main_480p_1000.mp4,stream=video,segment_template=h264_480p/$Number$.ts,playlist_name=h264_480p/main.m3u8,iframe_playlist_name=h264_480p/iframe.m3u8' \
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'in=h264_main_720p_3000.mp4,stream=video,segment_template=h264_720p/$Number$.ts,playlist_name=h264_720p/main.m3u8,iframe_playlist_name=h264_720p/iframe.m3u8' \
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'in=h264_high_1080p_6000.mp4,stream=video,segment_template=h264_1080p/$Number$.ts,playlist_name=h264_1080p/main.m3u8,iframe_playlist_name=h264_1080p/iframe.m3u8' \
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--hls_master_playlist_output h264_master.m3u8
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</pre></div>
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</div>
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</li>
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</ul>
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<p>The above packaging command creates five single track TS streams
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(4 video, 1 audio) and HLS playlists, which describe the streams.</p>
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<ul>
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<li><p>MP4 output is also supported:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ packager \
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'in=h264_baseline_360p_600.mp4,stream=audio,init_segment=audio/init.mp4,segment_template=audio/$Number$.m4s,playlist_name=audio/main.m3u8,hls_group_id=audio,hls_name=ENGLISH' \
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'in=input_text.vtt,stream=text,segment_template=text/$Number$.vtt,playlist_name=text/main.m3u8,hls_group_id=text,hls_name=ENGLISH' \
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'in=h264_baseline_360p_600.mp4,stream=video,init_segment=h264_360p/init.mp4,segment_template=h264_360p/$Number$.m4s,playlist_name=h264_360p/main.m3u8,iframe_playlist_name=h264_360p/iframe.m3u8' \
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'in=h264_main_480p_1000.mp4,stream=video,init_segment=h264_480p/init.mp4,segment_template=h264_480p/$Number$.m4s,playlist_name=h264_480p/main.m3u8,iframe_playlist_name=h264_480p/iframe.m3u8' \
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'in=h264_main_720p_3000.mp4,stream=video,init_segment=h264_720p/init.mp4,segment_template=h264_720p/$Number$.m4s,playlist_name=h264_720p/main.m3u8,iframe_playlist_name=h264_720p/iframe.m3u8' \
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'in=h264_high_1080p_6000.mp4,stream=video,init_segment=h264_1080p/init.mp4,segment_template=h264_1080p/$Number$.m4s,playlist_name=h264_1080p/main.m3u8,iframe_playlist_name=h264_1080p/iframe.m3u8' \
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--hls_master_playlist_output h264_master.m3u8
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</pre></div>
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</div>
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</li>
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</ul>
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<p>The above packaging command creates five groups of streams (each with an init
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segment and a series of media segments) and HLS playlists, which describe the
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streams.</p>
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<ul>
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<li><p>Single file MP4 output is also supported:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ packager \
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in=h264_baseline_360p_600.mp4,stream=audio,output=audio.mp4,playlist_name=audio.m3u8,hls_group_id=audio,hls_name=ENGLISH \
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in=h264_baseline_360p_600.mp4,stream=video,output=h264_360p.mp4,playlist_name=h264_360p.m3u8 \
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in=h264_main_480p_1000.mp4,stream=video,output=h264_480p.mp4,playlist_name=h264_480p.m3u8 \
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in=h264_main_720p_3000.mp4,stream=video,output=h264_720p.mp4,playlist_name=h264_720p.m3u8 \
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in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p.mp4,playlist_name=h264_1080p.m3u8 \
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--hls_master_playlist_output h264_master.m3u8
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</pre></div>
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</div>
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</li>
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</ul>
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<p>The above packaging command creates five single file MP4 streams and HLS
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playlists, which describe the streams.</p>
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<ul>
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<li><p>Single file MP4 output with DASH + HLS:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ packager \
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in=h264_baseline_360p_600.mp4,stream=audio,output=audio.mp4,playlist_name=audio.m3u8,hls_group_id=audio,hls_name=ENGLISH \
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in=h264_baseline_360p_600.mp4,stream=video,output=h264_360p.mp4,playlist_name=h264_360p.m3u8,iframe_playlist_name=h264_360p_iframe.m3u8 \
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in=h264_main_480p_1000.mp4,stream=video,output=h264_480p.mp4,playlist_name=h264_480p.m3u8,iframe_playlist_name=h264_480p_iframe.m3u8 \
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in=h264_main_720p_3000.mp4,stream=video,output=h264_720p.mp4,playlist_name=h264_720p.m3u8,iframe_playlist_name=h264_720p_iframe.m3u8 \
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in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p.mp4,playlist_name=h264_1080p.m3u8,iframe_playlist_name=h264_1080p_iframe.m3u8 \
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--hls_master_playlist_output h264_master.m3u8 \
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--mpd_output h264.mpd
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</pre></div>
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</div>
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</li>
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</ul>
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<p>The above packaging command creates five single file MP4 streams, and HLS
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playlists as well as DASH manifests.</p>
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<ul>
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<li><p>Output DASH + HLS with dash_only and hls_only options:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ packager \
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'in=h264_baseline_360p_600.mp4,stream=audio,init_segment=audio/init.mp4,segment_template=audio/$Number$.m4s' \
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'in=input_text.vtt,stream=text,init_segment=text/init.mp4,segment_template=text/$Number$.m4s,dash_only=1' \
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'in=input_text.vtt,stream=text,segment_template=text/$Number$.vtt,hls_only=1' \
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'in=h264_baseline_360p_600.mp4,stream=video,init_segment=h264_360p/init.mp4,segment_template=h264_360p/$Number$.m4s' \
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'in=h264_main_480p_1000.mp4,stream=video,init_segment=h264_480p/init.mp4,segment_template=h264_480p/$Number$.m4s' \
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'in=h264_main_720p_3000.mp4,stream=video,init_segment=h264_720p/init.mp4,segment_template=h264_720p/$Number$.m4s' \
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'in=h264_high_1080p_6000.mp4,stream=video,init_segment=h264_1080p/init.mp4,segment_template=h264_1080p/$Number$.m4s' \
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--generate_static_live_mpd --mpd_output h264.mpd \
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--hls_master_playlist_output h264_master.m3u8
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</pre></div>
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</div>
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</li>
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</ul>
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<p>The above packaging command creates HLS playlists and DASH manifest while using
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dash_only for creating segmented WebVTT in mp4 format and hls_only option for
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creating WebVTT in text format.</p>
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</section>
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<section id="configuration-options">
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<h2>Configuration options<a class="headerlink" href="#configuration-options" title="Permalink to this headline">¶</a></h2>
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<section id="hls-specific-stream-descriptor-fields">
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<h3>HLS specific stream descriptor fields<a class="headerlink" href="#hls-specific-stream-descriptor-fields" title="Permalink to this headline">¶</a></h3>
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<dl class="field-list simple">
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<dt class="field-odd">hls_name</dt>
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<dd class="field-odd"><p>Used for HLS audio to set the NAME attribute for EXT-X-MEDIA.
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Defaults to the base of the playlist name.</p>
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</dd>
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<dt class="field-even">hls_group_id</dt>
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<dd class="field-even"><p>Used for HLS audio to set the GROUP-ID attribute for EXT-X-MEDIA.
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Defaults to ‘audio’ if not specified.</p>
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</dd>
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<dt class="field-odd">playlist_name</dt>
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<dd class="field-odd"><p>The HLS playlist file to create. Usually ends with ‘.m3u8’, and is
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relative to hls_master_playlist_output (see below). If unspecified,
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defaults to something of the form ‘stream_0.m3u8’, ‘stream_1.m3u8’,
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‘stream_2.m3u8’, etc.</p>
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</dd>
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<dt class="field-even">iframe_playlist_name</dt>
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<dd class="field-even"><p>The optional HLS I-Frames only playlist file to create. Usually ends with
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‘.m3u8’, and is relative to hls_master_playlist_output (see below). Should
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only be set for video streams. If unspecified, no I-Frames only playlist is
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created.</p>
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</dd>
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<dt class="field-odd">hls_characteristics (charcs)</dt>
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<dd class="field-odd"><p>Optional colon or semi-colon separated list of values for the
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CHARACTERISTICS attribute for EXT-X-MEDIA. See CHARACTERISTICS attribute in
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<a class="reference external" href="http://bit.ly/2OOUkdB">http://bit.ly/2OOUkdB</a> for details.</p>
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</dd>
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</dl>
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</section>
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<section id="hls-options">
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<h3>HLS options<a class="headerlink" href="#hls-options" title="Permalink to this headline">¶</a></h3>
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<dl class="option-list">
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<dt><kbd><span class="option">--hls_master_playlist_output <var><file_path></var></span></kbd></dt>
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<dd><p>Output path for the master playlist for HLS. This flag must be used to
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output HLS.</p>
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</dd>
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<dt><kbd><span class="option">--hls_base_url <var><url></var></span></kbd></dt>
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<dd><p>The base URL for the Media Playlists and media files listed in the
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playlists. This is the prefix for the files.</p>
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</dd>
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<dt><kbd><span class="option">--hls_key_uri <var><uri></var></span></kbd></dt>
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<dd><p>The key uri for ‘identity’ and ‘com.apple.streamingkeydelivery’ (FairPlay)
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key formats. Ignored if the playlist is not encrypted or not using the above
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key formats.</p>
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</dd>
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<dt><kbd><span class="option">--hls_playlist_type <var><type></var></span></kbd></dt>
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<dd><p>VOD, EVENT, or LIVE. This defines the EXT-X-PLAYLIST-TYPE in the HLS
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specification. For hls_playlist_type of LIVE, EXT-X-PLAYLIST-TYPE tag is
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omitted.</p>
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</dd>
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<dt><kbd><span class="option">--time_shift_buffer_depth <var><seconds></var></span></kbd></dt>
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<dd><p>Guaranteed duration of the time shifting buffer for LIVE playlists, in
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seconds.</p>
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</dd>
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<dt><kbd><span class="option">--preserved_segments_outside_live_window <var><num_segments></var></span></kbd></dt>
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<dd><p>Segments outside the live window (defined by <cite>time_shift_buffer_depth</cite>
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above) are automatically removed except for the most recent X segments
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defined by this parameter. This is needed to accommodate latencies in
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various stages of content serving pipeline, so that the segments stay
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accessible as they may still be accessed by the player.</p>
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<p>The segments are not removed if the value is zero.</p>
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</dd>
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<dt><kbd><span class="option">--default_language <var><language></var></span></kbd></dt>
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<dd><p>The first audio/text rendition in a group tagged with this language will
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have ‘DEFAULT’ attribute set to ‘YES’. This allows the player to choose the
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correct default language for the content.</p>
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<p>This applies to both audio and text tracks. The default language for text
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tracks can be overriden by ‘default_text_language’.</p>
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</dd>
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<dt><kbd><span class="option">--default_text_language <var><text_language></var></span></kbd></dt>
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<dd><p>Same as above, but this applies to text tracks only, and overrides the
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default language for text tracks.</p>
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</dd>
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<dt><kbd><span class="option">--hls_media_sequence_number <var><unsigned_number></var></span></kbd></dt>
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<dd><p>HLS uses the EXT-X-MEDIA-SEQUENCE tag at the start of a live playlist in
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order to specify the first segment sequence number. This is because any
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live playlist have a limited number of segments, and they also keep
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updating with new segments while removing old ones. When a player refreshes
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the playlist, this information is important for keeping track of segments
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positions.</p>
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<p>When the packager starts, it naturally starts this count from zero. However,
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there are many situations where the packager may be restarted, without this
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meaning starting this value from zero (but continuing a previous sequence).
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The most common situations are problems in the encoder feeding the packager.</p>
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<p>With those cases in mind, this parameter allows to set the initial
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EXT-X-MEDIA-SEQUENCE value. This way, it’s possible to continue the sequence
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number from previous packager run.</p>
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<p>For more information about the reasoning of this, please see issue
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<a class="reference external" href="https://github.com/google/shaka-packager/issues/691">#691</a>.</p>
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<p>The EXT-X-MEDIA-SEQUENCE documentation can be read here:
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<a class="reference external" href="https://tools.ietf.org/html/rfc8216#section-4.3.3.2">https://tools.ietf.org/html/rfc8216#section-4.3.3.2</a>.</p>
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</dd>
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</dl>
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<p>–hls_only=0|1</p>
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<blockquote>
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<div><p>Optional. Defaults to 0 if not specified. If it is set to 1, indicates the
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stream is HLS only.</p>
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</div></blockquote>
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</section>
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<section id="segment-template-formatting">
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<h3>Segment template formatting<a class="headerlink" href="#segment-template-formatting" title="Permalink to this headline">¶</a></h3>
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<p>The implementation is based on <em>Template-based Segment URL construction</em>
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described in ISO/IEC 23009-1:2014.</p>
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<table class="styled-table docutils align-default" id="id2">
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<caption><span class="caption-text">Supported identifiers</span><a class="headerlink" href="#id2" title="Permalink to this table">¶</a></caption>
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<colgroup>
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<col style="width: 19%" />
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<col style="width: 41%" />
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<col style="width: 41%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="left-align head"><p>$<Identifier>$</p></th>
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<th class="left-align head"><p>Substitution parameter</p></th>
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<th class="left-align head"><p>Format</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td class="left-align"><p>$$</p></td>
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<td class="left-align"><p>is an escape sequence, i.e.
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“$$” is replaced with a single
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“$”.</p></td>
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<td class="left-align"><p>Not applicable.</p></td>
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</tr>
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<tr class="row-odd"><td class="left-align"><p>$Number$</p></td>
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<td class="left-align"><p>This identifier is substitued
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with the <em>number</em> of the
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corresponding Segment.</p></td>
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<td class="left-align"><p>The format tag may be present.</p>
|
||
<p>If no format tag is present, a
|
||
default format tag with
|
||
<em>width</em>=1 shall be used.</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="row-even"><td class="left-align"><p>$Time$</p></td>
|
||
<td class="left-align"><p>This identifier is substituted
|
||
with the value of the
|
||
<strong>SegmentTimeline@t</strong>
|
||
attribute for the Segment
|
||
being accessed. Either
|
||
$Number$ or $Time$ may be used
|
||
but not both at the same time.</p></td>
|
||
<td class="left-align"><p>The format tag may be present.</p>
|
||
<p>If no format tag is present, a
|
||
default format tag with
|
||
<em>width</em>=1 shall be used.</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>Identifiers $RepresentationID$ and $Bandwidth$ are not supported in this
|
||
version. Please file an <a class="reference external" href="https://github.com/google/shaka-packager/issues">issue</a> if you want it to be
|
||
supported.</p>
|
||
</div>
|
||
<p>In each URL, the identifiers shall be replaced by the substitution parameter
|
||
per the definition in the above table. Identifier matching is case-sensitive.</p>
|
||
<p>Each identifier may be suffixed, within the enclosing ‘$’ characters, with an
|
||
additional format tag aligned with the <em>printf</em> format tag as defined in IEEE
|
||
1003.1-2008 following this prototype:</p>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">%</span><span class="mi">0</span><span class="p">[</span><span class="n">width</span><span class="p">]</span><span class="n">d</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The <em>width</em> parameter is an unsigned integer that provides the minimum number
|
||
of characters to be printed. If the value to be printed is shorter than this
|
||
number, the result shall be padded with zeros. The value is not truncated even
|
||
if the result is larger.</p>
|
||
<p>Strings outside identifiers shall only contain characters that are permitted
|
||
within URLs according to RFC 3986.</p>
|
||
</section>
|
||
</section>
|
||
</section>
|
||
|
||
|
||
<div class="clearer"></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
|
||
<div class="sphinxsidebarwrapper">
|
||
<h3><a href="../index.html">Table of Contents</a></h3>
|
||
<ul>
|
||
<li><a class="reference internal" href="#">HLS</a><ul>
|
||
<li><a class="reference internal" href="#synopsis">Synopsis</a></li>
|
||
<li><a class="reference internal" href="#examples">Examples</a></li>
|
||
<li><a class="reference internal" href="#configuration-options">Configuration options</a><ul>
|
||
<li><a class="reference internal" href="#hls-specific-stream-descriptor-fields">HLS specific stream descriptor fields</a></li>
|
||
<li><a class="reference internal" href="#hls-options">HLS options</a></li>
|
||
<li><a class="reference internal" href="#segment-template-formatting">Segment template formatting</a></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
|
||
<h4>Previous topic</h4>
|
||
<p class="topless"><a href="dash.html"
|
||
title="previous chapter">DASH</a></p>
|
||
<h4>Next topic</h4>
|
||
<p class="topless"><a href="live.html"
|
||
title="next chapter">Live</a></p>
|
||
<div role="note" aria-label="source link">
|
||
<h3>This Page</h3>
|
||
<ul class="this-page-menu">
|
||
<li><a href="../_sources/tutorials/hls.rst.txt"
|
||
rel="nofollow">Show Source</a></li>
|
||
</ul>
|
||
</div>
|
||
<div id="searchbox" style="display: none" role="search">
|
||
<h3 id="searchlabel">Quick search</h3>
|
||
<div class="searchformwrapper">
|
||
<form class="search" action="../search.html" method="get">
|
||
<input type="text" name="q" aria-labelledby="searchlabel" />
|
||
<input type="submit" value="Go" />
|
||
</form>
|
||
</div>
|
||
</div>
|
||
<script>$('#searchbox').show(0);</script>
|
||
</div>
|
||
</div>
|
||
<div class="clearer"></div>
|
||
</div>
|
||
<div class="related" role="navigation" aria-label="related navigation">
|
||
<h3>Navigation</h3>
|
||
<ul>
|
||
<li class="right" style="margin-right: 10px">
|
||
<a href="../genindex.html" title="General Index"
|
||
>index</a></li>
|
||
<li class="right" >
|
||
<a href="live.html" title="Live"
|
||
>next</a> |</li>
|
||
<li class="right" >
|
||
<a href="dash.html" title="DASH"
|
||
>previous</a> |</li>
|
||
<li class="nav-item nav-item-0"><a href="../index.html">Shaka Packager documentation</a> »</li>
|
||
<li class="nav-item nav-item-1"><a href="tutorials.html" >Tutorials</a> »</li>
|
||
<li class="nav-item nav-item-this"><a href="">HLS</a></li>
|
||
</ul>
|
||
</div>
|
||
<div class="footer" role="contentinfo">
|
||
© Copyright 2017, Google.
|
||
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.0.2.
|
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|
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