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<h3><a href="../index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">HLS</a><ul>
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<li><a class="reference internal" href="#synopsis">Synopsis</a></li>
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<li><a class="reference internal" href="#examples">Examples</a><ul>
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<li><a class="reference internal" href="#hls-specific-stream-descriptor-fields">HLS specific stream descriptor fields</a></li>
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<li><a class="reference internal" href="#hls-options">HLS options</a></li>
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<li><a class="reference internal" href="#segment-template-formatting">Segment template formatting</a></li>
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</ul>
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<p class="topless"><a href="dash.html"
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title="previous chapter">DASH</a></p>
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<div class="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>.</p>
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<div class="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"><div class="highlight"><pre><span></span>$ packager {stream_descriptor with HLS specific descriptors} \
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[stream_descriptor with HLS specific descriptors] ... \
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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="first admonition-title">Note</p>
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<p class="last">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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</div>
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<div class="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 class="first">TS output:</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$ packager \
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'in=h264_baseline_360p_600.mp4,stream=audio,output=audio_$Number$.ts,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_$Number$.ts,playlist_name=h264_360p.m3u8' \
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'in=h264_main_480p_1000.mp4,stream=video,output=h264_480p_$Number$.ts,playlist_name=h264_480p.m3u8' \
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'in=h264_main_720p_3000.mp4,stream=video,output=h264_720p_$Number$.ts,playlist_name=h264_720p.m3u8' \
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'in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p_$Number$.ts,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 track TS streams
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(4 video, 1 audio) and a manifest, which describes the streams.</p>
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<ul>
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<li><p class="first">MP4 output is also supported:</p>
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<div class="highlight-default"><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.m3u8,hls_group_id=audio,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.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.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.m3u8' \
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'in=h264_main_1080p_6000.mp4,stream=video,init_segment=h264_1080p_init.mp4,segment_template=h264_1080p_$Number$.m4s,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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<li><p class="first">Single file MP4 output is also supported:</p>
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<div class="highlight-default"><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 groups of streams (each with an init
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segment and a series of media segments) and a manifest, which describes the
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streams.</p>
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<div class="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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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">hls_name:</th><td class="field-body">Required for audio when outputting HLS. name of the output stream. This is
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not (necessarily) the same as output. This is used as the NAME attribute for
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EXT-X-MEDIA.</td>
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</tr>
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<tr class="field-even field"><th class="field-name">hls_group_id:</th><td class="field-body">Required for audio when outputting HLS. The group ID for the output stream.
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This is used as the GROUP-ID attribute for EXT-X-MEDIA.</td>
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</tr>
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<tr class="field-odd field"><th class="field-name">playlist_name:</th><td class="field-body">Required for HLS output. Name of the playlist for the stream. Usually ends
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with ‘.m3u8’.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="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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<table class="docutils option-list" frame="void" rules="none">
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<col class="option" />
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<col class="description" />
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<tbody valign="top">
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<tr><td class="option-group" colspan="2">
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<kbd><span class="option">--hls_master_playlist_output <var><file_path></var></span></kbd></td>
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</tr>
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<tr><td> </td><td>Output path for the master playlist for HLS. This flag must be used to
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output HLS.</td></tr>
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<tr><td class="option-group" colspan="2">
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<kbd><span class="option">--hls_base_url <var><url></var></span></kbd></td>
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</tr>
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<tr><td> </td><td>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.</td></tr>
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<tr><td class="option-group" colspan="2">
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<kbd><span class="option">--hls_playlist_type <var><type></var></span></kbd></td>
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</tr>
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<tr><td> </td><td>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.</td></tr>
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</tbody>
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</table>
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</div>
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<div class="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 border="1" class="styled-table docutils" id="id1">
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<caption><span class="caption-text">Supported identifiers</span><a class="headerlink" href="#id1" title="Permalink to this table">¶</a></caption>
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<colgroup>
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<col width="19%" />
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<col width="41%" />
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<col width="41%" />
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</colgroup>
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<thead valign="bottom">
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<tr class="row-odd"><th class="left-align head">$<Identifier>$</th>
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<th class="left-align head">Substitution parameter</th>
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<th class="left-align head">Format</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr class="row-even"><td class="left-align">$$</td>
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<td class="left-align">is an escape sequence, i.e.
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“$$” is replaced with a single
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“$”.</td>
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<td class="left-align">Not applicable.</td>
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</tr>
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<tr class="row-odd"><td class="left-align">$Number$</td>
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<td class="left-align">This identifier is substitued
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with the <em>number</em> of the
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corresponding Segment.</td>
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<td class="left-align"><p class="first">The format tag may be present.</p>
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<p class="last">If no format tag is present, a
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default format tag with
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<em>width</em>=1 shall be used.</p>
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</td>
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</tr>
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<tr class="row-even"><td class="left-align">$Time$</td>
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<td class="left-align">This identifier is substituted
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with the value of the
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<strong>SegmentTimeline@t</strong>
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attribute for the Segment
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being accessed. Either
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$Number$ or $Time$ may be used
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but not both at the same time.</td>
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<td class="left-align"><p class="first">The format tag may be present.</p>
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<p class="last">If no format tag is present, a
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default format tag with
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<em>width</em>=1 shall be used.</p>
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</td>
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</tr>
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</tbody>
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</table>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Identifiers $RepresentationID$ and $Bandwidth$ are not supported in this
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version. Please file an <a class="reference external" href="https://github.com/google/shaka-packager/issues">issue</a> if you want it to be
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supported.</p>
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</div>
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<p>In each URL, the identifiers shall be replaced by the substitution parameter
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per the definition in the above table. Identifier matching is case-sensitive.</p>
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<p>Each identifier may be suffixed, within the enclosing ‘$’ characters, with an
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additional format tag aligned with the <em>printf</em> format tag as defined in IEEE
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1003.1-2008 following this prototype:</p>
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<div class="highlight-default"><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>
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</pre></div>
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</div>
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<p>The <em>width</em> parameter is an unsigned integer that provides the minimum number
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of characters to be printed. If the value to be printed is shorter than this
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number, the result shall be padded with zeros. The value is not truncated even
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if the result is larger.</p>
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<p>Strings outside identifiers shall only contain characters that are permitted
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within URLs according to RFC 3986.</p>
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</div>
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</div>
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</div>
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