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• What transcoding services can people recommend ? [closed]

  3 mai 2013, par Adrian Lynch

  A client of mine needs to accept a bunch of different video files and convert them to FLV. My experience with FFMEG on a previous project has highlighted that there will be some troublesome files.

  Depending on the price my client will pay for a professional service.

  What are people using and how are you finding the service ?

  Thanks.

• Adding audio to video without re encoding [migrated]

  4 mars 2015, par user1503606

  I am looking to add audio to a video without having to re encode the two pieces.

  I have looked at a few questions on stack overflow followed the answers and i still cant seemed to get it to work, if anyone can spot what i am missing please help.

  I am running this code.

  ffmpeg -i DJ_Mes_Rescue-Some_Day-Guesthouse_Music.mp3 -i output.mp4 -map 0:0 -map 1:0 -acodec copy -vcodec copy -shortest edit2.mp4 

  Now from what i understand ffmpeg is mapping the stream over the top ffmpeg info for the audio track is.

  Input #0, mp3, from 'DJ_Mes_Rescue-Some_Day-Guesthouse_Music.mp3':
  
    Metadata:
  
      encoder         : LAME 64bits version 3.98.4 (http://www.mp3dev.org/)
  
      title           : Some Day
  
      artist          : DJ Mes, Rescue
  
      TLEN            : 378750
  
      genre           : House
  
      track           : 1/0
  
      date            : 2015
  
    Duration: 00:06:18.80, start: 0.025056, bitrate: 320 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Side data:
  
        replaygain: track gain - -10.100000, track peak - unknown, album gain - unknown, album peak - unknown, 
  
      Stream #0:1: Video: png, rgb24, 225x225, 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : 
  
        comment         : Other

  And for the video it is.

  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.15.102
  
    Duration: 00:00:49.46, start: 0.046440, bitrate: 566 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 568x320, 462 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        handler_name    : VideoHandler
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  So i am mapping the stream 0:0 from the audio file to 1:0 from the video file, but all i seem to get is a video with no audio.

  Can someone help ?

  UPDATE whole output added

  ffmpeg -i Saison-Please_Don%27t_Go-Guesthouse_Music.mp3 -i output.mp4 -c copy -map 0:0 -map 1:0 -shortest mixed.mp4
  
  ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 12 2015 10:15:06 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.5.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1_1/include/openjpeg-1.5 ' --enable-nonfree --enable-vda
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mp3, from 'Saison-Please_Don%27t_Go-Guesthouse_Music.mp3':
  
    Metadata:
  
      encoder         : LAME 64bits version 3.98.4 (http://www.mp3dev.org/)
  
      title           : Please Donât Go
  
      artist          : Saison
  
      TLEN            : 408492
  
      genre           : House
  
      track           : 1/0
  
      date            : 2015
  
    Duration: 00:06:48.53, start: 0.025056, bitrate: 320 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Side data:
  
        replaygain: track gain - -8.400000, track peak - unknown, album gain - unknown, album peak - unknown, 
  
      Stream #0:1: Video: png, rgb24, 225x225, 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : 
  
        comment         : Other
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.15.102
  
    Duration: 00:00:49.46, start: 0.046440, bitrate: 566 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 568x320, 462 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        handler_name    : VideoHandler
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to 'mixed.mp4':
  
    Metadata:
  
      date            : 2015
  
      title           : Please Donât Go
  
      artist          : Saison
  
      TLEN            : 408492
  
      genre           : House
  
      track           : 1/0
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Audio: mp3 (i[0][0][0] / 0x0069), 44100 Hz, stereo, 320 kb/s
  
      Metadata:
  
        encoder         : LAME3.98r
  
      Side data:
  
        replaygain: track gain - -8.400000, track peak - unknown, album gain - unknown, album peak - unknown, 
  
      Stream #0:1(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 568x320, q=2-31, 462 kb/s, 30 fps, 15360 tbn, 15360 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        handler_name    : VideoHandler
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 1481 fps=0.0 q=-1.0 Lsize=    4759kB time=00:00:49.34 bitrate= 790.0kbits/s    
  
  video:2785kB audio:1929kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.960839%

  ANOTHER UPDATE :

  So i have tried the following

   ffmpeg -i 3.mp4 -i Saison-Please_Don%27t_Go-Guesthouse_Music.mp3 -i Saison-Please_Don%27t_Go-Guesthouse_Music.mp3 -map 0:0 -map 0:1 -map 1:0 -map 2:0 -c:v copy -c:a copy 23.mp4

  and if i run.

   ffmpeg -i 23.mp4 

  You can see the streams/audio has been added but it is not playing ?

  Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.15.102
  
    Duration: 00:06:48.53, start: 0.025057, bitrate: 713 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 568x320, 462 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        handler_name    : VideoHandler
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 319 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:3(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, s16p, 319 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler

  ONE MORE UPDATE THIS SEEMS TO WORK :

  ffmpeg -i 3.mp4 -i Saison-Please_Don%27t_Go-Guesthouse_Music.mp3 -map 0:0 -map 0:1 -map 1:0  -c:v copy -c:a copy 234.mp4 && ffmpeg -i 234.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy new_file3.mp4

• ARM compiler update

  15 janvier 2010, par Mans — ARM, Compilers

  Since my last shootout, all the tested vendors have updated their compilers. Here is a quick update on each of them.

  Both the 4.3 and 4.4 branches of FSF GCC have had bugfix releases, bringing them to 4.3.4 and 4.4.2, respectively. Neither update contains anything particularly noteworthy.

  The CodeSourcery 2009q3 release sees an update to a GCC 4.4 base, a significant change from the 4.3 base used in 2009q1. The update is a mixed blessing. In fact, it is mostly a curse and hardly a blessing at all. On the bright side, the floating-point speed regressions in 2009q1 are gone, 2009q3 being a few per cent faster even than 2007q3. Unfortunately, this improvement is completely overshadowed by a major speed regression on integer code, a whopping 24% in one case. This ties in with the slowdown previously observed with FSF GCC 4.4 compared to 4.3.

  ARM RVCT 4.0 is now at Build 697. This update fixes some bugs and introduces others. Notably, it no longer builds FFmpeg correctly. The issue has been reported to ARM.

  Texas Instruments, finally, have made a formal release, v4.6.1, of their TMS470 compiler incorporating various fixes allowing it to build a moderately patched FFmpeg. The performance remains somewhere between GCC and RVCT on average.

  In light of the above, my recommendations remain unchanged :

  • For a free compiler, choose CodeSourcery 2009q1. It beats GCC 4.3.4 by 5-10% in most cases.
  • GNU purists are best served by GCC 4.3.4, which is up to 20% faster than 4.4.2 and rarely slower.
  • When price is not a concern, ARM RCVT is a good option, outperforming GCC by up to a factor 2.
  • In all cases, disable any auto-vectorisation features.

  Regardless of which compiler is chosen, I cannot overstress the importance of testing. All compilers are crawling with bugs, and even the most innocent-looking code change can trigger one of them. When using a compiler other than GCC, extra caution is advised considering a lot of code is developed using only GCC and may thus fall prey to bugs unique to said other compiler.