Convert a video to MP4 H 264 AAC with ffmpeg

Question

If I don t make a mistake  Safari currently need MP4  H 264 AAC  video encoded for the HTML5  lt video gt  element   So I tried to convert a video to this format with ffmpeg  However when I enter the shell command ffmpeg -i video flv video mp4  the returned error is       Seems stream 0 codec frame rate   differs from container frame rate    2000 00  2000 1  -  29 92  359 12  Input  0  flv  from  video flv     Duration  00 05 01 20  start    0 000000  bitrate  66 kb s       Stream  0 0  Video  h264  yuv420p  320x240  PAR 1 1 DAR 4 3   66 kb s    29 92 tbr  1k tbn  2k tbc       Stream  0 1  Audio  aac  22050 Hz  stereo  s16 Output  0  mp4  to    video mp4         Stream  0 0  Video  mpeg4  yuv420p  320x240  PAR 1 1 DAR 4 3     q 2-31  200 kb s  90k tbn  29 92 tbc       Stream  0 1  Audio  0x0000  22050 Hz  stereo  s16  64 kb s Stream   mapping    Stream  0 0 -   0 0   Stream  0 1 -   0 1 Unsupported codec   for output stream  0 1   An AAC codec is required but I m quite newbie with ubuntu and I dont really now how to fix this problem  I m using Ubuntu 9 10 Karmik Koala  for amd64    Thank you very much

User · Answer

Software patents led Debian Ubuntu to disable the H 264 and AAC encoders in ffmpeg   See  usr share doc ffmpeg README Debian gz   So go install x264  mplayer mencoder  and Nero s AAC encoder    Or  if you want to use all Free software  and don t care so much about audio quality  then sudo aptitude install faac    I don t remember if the medibuntu package of mencoder includes x264 vid encoding  since I build my own from git x264 and svn mplayer sources    x264 is very actively developed  with significant quality and speed improvements frequently added   http   git videolan org  p x264 git a summary  x264 is also packaged  but you should check that it s up to date enough to include weightp with recent bugfixes  and even more recent speed improvements     Or if you re already willing to convert from  flv  instead of going from the high-quality source the flv was made from  then probably whatever recent version of x264 you can find will be fine

User · Answer

Try This one   Libav in Linux             Installation  run command                  sudo apt-get install libav-tools   Video conversion command  Go to folder contains the video and run in terminal                avconv -i oldvideo flv -ar 22050 convertedvideo mp4

User · Answer

You need to recompile ffmpeg  from source  so that it supports x264  If you follow the instructions in this page  then you will be able to peform any kind of conversion you want

User · Answer

You need to compile ffmpeg with an AAC encoder  You can find one at AudioCoding

User · Answer

You re trying to convert a  rather rare   flv file that  already  contains H 264 video and AAC audio   Formatting your console s output as FFmpeg brings out these details    Input  0  flv  from  video flv      Duration  00 05 01 20  start  0 000000  bitrate  66 kb s     Stream  0 0  Video  h264  yuv420p  320x240  PAR 1 1 DAR 4 3   66 kb s  29 92 tbr  1k tbn  2k tbc      Stream  0 1  Audio  aac  22050 Hz  stereo  s16   The original flv is converted to an  mp4 file with H 264 video and AAC audio  just like the original  flv    Output  0  mp4  to  video mp4        Stream  0 0  Video  mpeg4  yuv420p  320x240  PAR 1 1 DAR 4 3   q 2-31  200 kb s  90k tbn  29 92 tbc      Stream  0 1  Audio  0x0000  22050 Hz  stereo  s16  64 kb s   Because the audio and video data in the  flv are already in the format codecs you need for the  mp4  you can just copy everything to the new  mp4 container  This process will be massively faster than decoding and reencoding everything   ffmpeg -i video flv -vcodec copy -acodec copy video mp4   or more simply   ffmpeg -i video flv -codec copy video mp4   The real error you re getting is      Unsupported codec for output stream  0 1   Which means FFmpeg can t convert audio  stream  0 1  to AAC    You can skip the error by    copying the audio data since it s already AAC encoded  use the copy command above    or you can solve the error by    using a FFmpeg build with AAC decode encode support  FFmpeg currently supports 4 AAC libraries  see FFmpeg and AAC Encoding Guide     For more details you should also read Converting FLV to MP4 With FFmpeg The Ultimate Guide

User · Answer

You can also try adding the Motumedia PPA to your apt sources and update your ffmpeg packages

User · Answer

Had this problem recently with converting nasty WMV into Final Cut Pro X for editing   Flow player can do it but it leaves a water mark  so I fiddled a bit with ffmpeg till I got something going   First install ffmpeg - I used  brew install ffmpeg Obviously you need brew installed first  google that bit   Next I wrote a simple command line script with the following content - you can substitute the  1 for an input   output file or just create a shell script file    vi convert sh Paste   echo  Pass one  ffmpeg -y -i   1  -c v libx264 -preset medium -b v 1555k -pass 1 -c a libfaac -b a 256k -f mp4  dev null  amp  amp  echo  Pass two  ffmpeg -i   1  -c v libx264 -preset medium -b v 1555k -pass 2 -c a libfaac -b a 256k   1 mp4    Then to convert your video    sh convert sh myvideofile wmv If all went well you should see a new file called myvideofile wmv mp4   Hope that works for you

User · Answer

http   handbrake fr is a nice high level tool with a lot of useful presets for mp4 for iPod  PS3      with both GUI and CLI interfaces for Linux  Windows and Mac OS X   It comes with its own dependencies as a single statically linked fat binary so you have all the x264   aac codecs included       HandBrakeCLI -Z Universal -i myinputfile mov -o myoutputfile mp4   To list all the available presets       HandBrakeCLI -z

[linux] Convert a video to MP4 (H.264/AAC) with ffmpeg

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