Revert "Commit updated Javascript packages"
This reverts commit a88734348a.
This commit is contained in:
Gabe Kangas
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build/javascript/node_modules/@videojs/http-streaming/docs/creating-content.md
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build/javascript/node_modules/@videojs/http-streaming/docs/creating-content.md
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# Creating Content
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## Commands for creating tests streams
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### Streams with EXT-X-PROGRAM-DATE-TIME for testing seekToProgramTime and convertToProgramTime
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lavfi and testsrc are provided for creating a test stream in ffmpeg
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-g 300 sets the GOP size to 300 (keyframe interval, at 30fps, one keyframe every 10 seconds)
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-f hls sets the format to HLS (creates an m3u8 and TS segments)
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-hls\_time 10 sets the goal segment size to 10 seconds
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-hls\_list\_size 20 sets the number of segments in the m3u8 file to 20
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-program\_date\_time an hls flag for setting #EXT-X-PROGRAM-DATE-TIME on each segment
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```
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ffmpeg \
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-f lavfi \
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-i testsrc=duration=200:size=1280x720:rate=30 \
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-g 300 \
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-f hls \
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-hls_time 10 \
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-hls_list_size 20 \
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-hls_flags program_date_time \
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stream.m3u8
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```
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## Commands used for segments in `test/segments` dir
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### video.ts
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Copy only the first two video frames, leave out audio.
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```
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$ ffmpeg -i index0.ts -vframes 2 -an -vcodec copy video.ts
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```
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### audio.ts
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Copy only the first two audio frames, leave out video.
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```
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$ ffmpeg -i index0.ts -aframes 2 -vn -acodec copy audio.ts
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```
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### caption.ts
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Copy the first two frames of video out of a ts segment that already includes CEA-608 captions.
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`ffmpeg -i index0.ts -vframes 2 -an -vcodec copy caption.ts`
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### id3.ts
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Copy only the first five frames of video, leave out audio.
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`ffmpeg -i index0.ts -vframes 5 -an -vcodec copy smaller.ts`
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Create an ID3 tag using [id3taggenerator][apple_streaming_tools]:
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`id3taggenerator -text "{\"id\":1, \"data\": \"id3\"}" -o tag.id3`
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Create a file `macro.txt` with the following:
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`0 id3 tag.id3`
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Run [mediafilesegmenter][apple_streaming_tools] with the small video segment and macro file, to produce a new segment with ID3 tags inserted at the specified times.
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`mediafilesegmenter -start-segments-with-iframe --target-duration=1 --meta-macro-file=macro.txt -s -A smaller.ts`
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### mp4Video.mp4
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Copy only the first two video frames, leave out audio.
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movflags:
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* frag\_keyframe: "Start a new fragment at each video keyframe."
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* empty\_moov: "Write an initial moov atom directly at the start of the file, without describing any samples in it."
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* omit\_tfhd\_offset: "Do not write any absolute base\_data\_offset in tfhd atoms. This avoids tying fragments to absolute byte positions in the file/streams." (see also: https://www.w3.org/TR/mse-byte-stream-format-isobmff/#movie-fragment-relative-addressing)
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```
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$ ffmpeg -i file.mp4 -movflags frag_keyframe+empty_moov+omit_tfhd_offset -vframes 2 -an -vcodec copy mp4Video.mp4
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```
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### mp4Audio.mp4
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Copy only the first two audio frames, leave out video.
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movflags:
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* frag\_keyframe: "Start a new fragment at each video keyframe."
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* empty\_moov: "Write an initial moov atom directly at the start of the file, without describing any samples in it."
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* omit\_tfhd\_offset: "Do not write any absolute base\_data\_offset in tfhd atoms. This avoids tying fragments to absolute byte positions in the file/streams." (see also: https://www.w3.org/TR/mse-byte-stream-format-isobmff/#movie-fragment-relative-addressing)
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```
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$ ffmpeg -i file.mp4 -movflags frag_keyframe+empty_moov+omit_tfhd_offset -aframes 2 -vn -acodec copy mp4Audio.mp4
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```
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### mp4VideoInit.mp4 and mp4AudioInit.mp4
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Using DASH as the format type (-f) will lead to two init segments, one for video and one for audio. Using HLS will lead to one joined.
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Renamed from .m4s to .mp4
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```
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$ ffmpeg -i input.mp4 -f dash out.mpd
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```
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### webmVideoInit.webm and webmVideo.webm
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```
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$ cat mp4VideoInit.mp4 mp4Video.mp4 > video.mp4
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$ ffmpeg -i video.mp4 -dash_segment_type webm -c:v libvpx-vp9 -f dash output.mpd
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$ mv init-stream0.webm webmVideoInit.webm
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$ mv chunk-stream0-00001.webm webmVideo.webm
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```
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## Other useful commands
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### Joined (audio and video) initialization segment (for HLS)
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Using DASH as the format type (-f) will lead to two init segments, one for video and one for audio. Using HLS will lead to one joined.
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Note that -hls\_fmp4\_init\_filename defaults to init.mp4, but is here for readability.
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Without specifying fmp4 for hls\_segment\_type, ffmpeg defaults to ts.
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```
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$ ffmpeg -i input.mp4 -f hls -hls_fmp4_init_filename init.mp4 -hls_segment_type fmp4 out.m3u8
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```
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[apple_streaming_tools]: https://developer.apple.com/documentation/http_live_streaming/about_apple_s_http_live_streaming_tools
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