[FFmpeg-user] converting to AAC audio duration changes

Lou lou at lrcd.com
Wed Sep 18 06:15:20 CEST 2013

On Mon, 16 Sep 2013 14:44:10 -0700 (PDT)
Jeanne Rich <jrich at laika.com> wrote:

> /local/prod/b3p/2.0/ffmpeg/HEAD/bin/ffmpeg '-i' '/laika/home/j/jrich/data/hbm_edit/0100_MON_2012_10_22_QT.mov' '-f' 'mov' '-preset' 'slow' '-profile:v' 'main' '-pix_fmt' 'yuv420p' '-crf' '1' '-bf' '0' '-movflags' 'faststart' '-r' '24.0' '-map_metadata' '-1:s' '-acodec' 'libfaac' '-aq' '1' '-ar' '48000' '-ac' '2' '-ab' '128k' '-y' '/laika/tmp/jrich/trans/outH264.mov' 

Unrelated to your question, but -aq and -ab are mutually exclusive.

> ffmpeg version 2.0-b7dd459 Copyright (c) 2000-2013 the FFmpeg developers 
> built on Sep 16 2013 12:06:10 with gcc 4.1.2 (GCC) 
> configuration: --prefix=/local/prod/b3p/2.0/ffmpeg/HEAD --enable-gpl --enable-nonfree --enable-pthreads --enable-static --enable-shared --enable-postproc --disable-debug --enable-avfilter --enable-zlib --enable-libvorbis --enable-libfaac --enable-libx264 --enable-libmp3lame --enable-libvpx --enable-filter=movie --enable-libfreetype ...

Also unrelated: "--enable-pthreads --enable-postproc --enable-avfilter
--enable-zlib --enable-filter=movie" should all be automatically
detected if I recall correctly.  Note that libfdk_aac is generally
considered to provide better quality than libfaac, so if you plan on
re-compiling anytime soon it may be worth considering. Also see:

> Below is the file I am using for the concat demuxer: Is this formatted
> correctly? 
> file /laika/tmp/jrich/trans/outVideoSegment1.mov 
> duration 1.000000 
> file /laika/tmp/jrich/trans/outVideoSegment2.mov 
> duration 1.000000 

Can you also show your concat command and resulting console output? (I
may have missed it.)

Tell George H. "Lou from AK says hi".


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