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Updated Live vpx transcoding plus packaging (markdown)

Kongqun Yang 2016-05-11 14:08:19 -07:00
parent d0a4b0d985
commit ac04eb57be
1 changed files with 6 additions and 2 deletions
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Live-vpx-transcoding-plus-packaging.md

@ -13,7 +13,8 @@ mkfifo pipe1
## Transcoding Command
```
ffmpeg -i udp://225.1.1.8:8001?localaddr=172.29.46.122 -g 90 -speed 4 -threads 8 -c:v libvpx -f webm pipe: > pipe1
ffmpeg -i udp://225.1.1.8:8001?localaddr=172.29.46.122 -g 90 -speed 4 -threads 8 -c:v libvpx \
-f webm pipe: > pipe1
```
Option `-speed 4` tells the encoder to encode really fast, sacrificing quality. This is needed otherwise ffmpeg is not fast enough to keep up with the live stream.
@ -21,7 +22,10 @@ Option `-speed 4` tells the encoder to encode really fast, sacrificing quality.
## Packaging Command
```
packager in=pipe1,stream=audio,init_segment=livehd-audio.webm,segment_template=livehd-audio-\$Number\$.webm in=pipe1,stream=video,init_segment=livehd-video.webm,template=livehd-video-\$Number\$.webm --mpd_output livehd.mpd --profile live --dump_stream_info --min_buffer_time=10 --time_shift_buffer_depth=300 --segment_duration=3 --io_block_size 65536
packager in=pipe1,stream=audio,init_segment=livehd-audio.webm,segment_template=livehd-audio-\$Number\$.webm \
in=pipe1,stream=video,init_segment=livehd-video.webm,template=livehd-video-\$Number\$.webm \
--mpd_output livehd.mpd --profile live --dump_stream_info --min_buffer_time=10 \
--time_shift_buffer_depth=300 --segment_duration=3 --io_block_size 65536
```
Option `-io_block_size 65536` tells packager to use an io_block_size of 65K for threaded io file. This is necessary as reading from pipe blocks until the specified number of bytes, which is specified in io_block_size for threaded io file, thus the value of io_block_size cannot be too large.