Transcode and segment with ffmpeg

ffmpeghttp-live-streaming

It appears that ffmpeg now has a segmenter in it, or at least there is a command line option

-f segment

in the documentation.

Does this mean I can use ffmpeg to realtime-transcode a video into h.264 and deliver segmented IOS compatible .m3u8 streams using ffmpeg alone? if so, what would a command to transcode an arbitrary video file to a segmented h.264 aac 640 x 480 stream ios compatible stream?

Best Answer

Absolutely - you can use -f segment to chop video into pieces and serve it to iOS devices. ffmpeg will create segment files .ts and you can serve those with any web server.

Working example (with disabled sound) - ffmpeg version N-39494-g41a097a:

./ffmpeg -v 9 -loglevel 99 -re -i sourcefile.avi -an \
-c:v libx264 -b:v 128k -vpre ipod320 \ 
-flags -global_header -map 0 -f segment -segment_time 4 \
-segment_list test.m3u8 -segment_format mpegts stream%05d.ts

Tips:

make sure you compile ffmpeg from most recent git repository
compile with libx264 codec
-map 0 is needed

How I compiled FFMPEG - with extra rtmp support to get feeds from flash-media-server

export PKG_CONFIG_PATH="/usr/lib/pkgconfig/:../rtmpdump-2.3/librtmp"    

./configure --enable-librtmp --enable-libx264 \
--libdir='../x264/:/usr/local/lib:../rtmpdump-2.3' \
--enable-gpl --enable-pthreads --enable-libvpx \
--disable-ffplay --disable-ffserver --disable-shared --enable-debug

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Rotate 90 clockwise:

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For the transpose parameter you can pass:

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Use -vf "transpose=2,transpose=2" for 180 degrees.

Make sure you use a recent ffmpeg version from here (a static build will work fine).

Note that this will re-encode the audio and video parts. You can usually copy the audio without touching it, by using -c:a copy. To change the video quality, set the bitrate (for example with -b:v 1M) or have a look at the H.264 encoding guide if you want VBR options.

A solution is also to use this convenience script.

Javascript – In Node.js Express/Connect, is there a way to set the session to infinity

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cookie Session cookie settings, defaulting to { path: '/', httpOnly: true, maxAge: 14400000 }

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Best Answer

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