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shaka-packager
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Add sample usage for trick play in README.md. 

Change-Id: I1c1f4af37b3573ffdbcc4368826417f1d07da437
This commit is contained in:
Haoming Chen 2017-05-17 15:53:32 -07:00
parent 18cdbd4121
commit 32b088c4bc
2 changed files with 13 additions and 0 deletions
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10
README.md
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@ -361,3 +361,13 @@ packager \
--hls_master_playlist_output="master_playlist.m3u8" \ --hls_master_playlist_output="master_playlist.m3u8" \
--hls_base_url="http://localhost:10000/" --hls_base_url="http://localhost:10000/"
``` ```
Create DASH trick play, a.k.a. trick mode, stream. The `trick_play_factor` in
the stream descriptor specifies the sampling rate among the key frames in the
video. For example, 1 means every key frame and 2 means every other key frame.
```Shell
packager \
'input=bear-1280x720.mp4,stream=video,output=bear-1280x720_video.mp4' \
'input=bear-1280x720.mp4,stream=video,output=bear-1280x720_video_trick_play.mp4,trick_play_factor=1' \
--mpd_output bear_trick_play.mpd
```

3
packager/app/packager_main.cc
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@ -100,6 +100,9 @@ const char kUsage[] =
" - output_format (format): Optional value which specifies the format\n" " - output_format (format): Optional value which specifies the format\n"
" of the output files (MP4 or WebM). If not specified, it will be\n" " of the output files (MP4 or WebM). If not specified, it will be\n"
" derived from the file extension of the output file.\n" " derived from the file extension of the output file.\n"
" - trick_play_factor (tpf): Optional value which specifies the trick\n"
" play, a.k.a. trick mode, stream sampling rate among key frames.\n"
" If specified, the output is a trick play stream.\n"
" - hls_name: Required for audio when outputting HLS.\n" " - hls_name: Required for audio when outputting HLS.\n"
" name of the output stream. This is not (necessarily) the same as\n" " name of the output stream. This is not (necessarily) the same as\n"
" output. This is used as the NAME attribute for EXT-X-MEDIA\n" " output. This is used as the NAME attribute for EXT-X-MEDIA\n"