From ac04eb57be152ce6421f7435b9012c997831fec7 Mon Sep 17 00:00:00 2001 From: Kongqun Yang Date: Wed, 11 May 2016 14:08:19 -0700 Subject: [PATCH] Updated Live vpx transcoding plus packaging (markdown) --- Live-vpx-transcoding-plus-packaging.md | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/Live-vpx-transcoding-plus-packaging.md b/Live-vpx-transcoding-plus-packaging.md index a9c9850..2c2b4c3 100644 --- a/Live-vpx-transcoding-plus-packaging.md +++ b/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.