85 lines
3.4 KiB
ReStructuredText
85 lines
3.4 KiB
ReStructuredText
DASH
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====
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Dynamic Adaptive Streaming over HTTP (DASH) is an adaptive bitrate streaming
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technique that enables high quality streaming of media content over HTTP.
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Shaka Packager supports DASH content packaging. This tutorial covers DASH
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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`; for full documentation,
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see :doc:`/documentation`.
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Synopsis
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--------
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::
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$ packager <stream_descriptor> ... \
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--mpd_output <manifest_output_path> \
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[Other DASH options] \
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[Other options, e.g. DRM options, HLS options]
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See `DASH options`_ for the available DASH 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`. It can be
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applied to VP9 in the same way.
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* on-demand::
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$ packager \
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in=h264_baseline_360p_600.mp4,stream=audio,output=audio.mp4 \
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in=input_text.vtt,stream=text,output=output_text.vtt \
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in=h264_baseline_360p_600.mp4,stream=video,output=h264_360p.mp4 \
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in=h264_main_480p_1000.mp4,stream=video,output=h264_480p.mp4 \
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in=h264_main_720p_3000.mp4,stream=video,output=h264_720p.mp4 \
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in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p.mp4 \
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--mpd_output h264.mpd
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The above packaging command creates five single track fragmented mp4 streams
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(4 video, 1 audio), a subtitle file and a manifest, which describes the streams.
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* on-demand with trick-play tracks::
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$ packager \
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in=h264_baseline_360p_600.mp4,stream=audio,output=audio.mp4 \
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in=input_text.vtt,stream=text,output=output_text.vtt \
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in=h264_baseline_360p_600.mp4,stream=video,output=h264_360p.mp4 \
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in=h264_main_480p_1000.mp4,stream=video,output=h264_480p.mp4 \
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in=h264_main_720p_3000.mp4,stream=video,output=h264_720p.mp4 \
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in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p.mp4 \
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in=h264_main_480p_1000.mp4,stream=video,output=h264_480p.mp4,trick_play_factor=1 \
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in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p.mp4,trick_play_factor=1 \
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--mpd_output h264.mpd
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The above packaging command creates two extra trick play tracks, besides the files
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genereated with the previous command.
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* static-live::
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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' \
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'in=input_text.vtt,stream=text,init_segment=text/init.mp4,segment_template=text/$Number$.m4s' \
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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_mpd --mpd_output h264.mpd
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The above packaging command creates five groups of segments (each with an init
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segment and a series of media segments) for the five streams and a manifest,
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which describes the streams.
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.. include:: /tutorials/dash_hls_example.rst
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.. include:: /options/dash_options.rst
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.. include:: /options/segment_template_formatting.rst
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