88 lines
4.2 KiB
Plaintext
88 lines
4.2 KiB
Plaintext
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HLS
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===
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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.
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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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:doc:`live`; for content encryption, see :doc:`drm`.
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Synopsis
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--------
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::
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$ 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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See `HLS specific stream descriptor fields`_ for the available HLS specific
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stream descriptor fields.
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See `HLS options`_ for the available HLS related options.
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.. note::
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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.
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Examples
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---------
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The examples below uses the H264 streams created in :doc:`encoding`.
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* TS output::
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$ 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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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.
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* MP4 output is also supported::
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$ 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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* Single file MP4 output is also supported::
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$ 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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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.
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.. include:: /options/hls_stream_descriptors.rst
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.. include:: /options/hls_options.rst
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.. include:: /options/segment_template_formatting.rst
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