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• ffmpeg - when merging an image and audio, audio gets shortened

  25 août 2014, par Gary

  I am trying to merge a png image with 11 seconds of audio and create an mp4 file. When I execute ffmpeg I end up with a total duration of 10 seconds for the mp4 file. The command I’m using is...

  ffmpeg -r 6 -loop 1 -i "image1.png" -i "audio1.wav" out.mp4

  UPDATE : Here is the log that is produced...

  FFmpeg version SVN-r15986, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
    configuration: --extra-cflags=-fno-common --enable-memalign-hack --enable-pthr
  
    eads --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libtheora
  
    --enable-libspeex --enable-libfaac --enable-libgsm --enable-libx264 --enable-lib
  
  schroedinger --enable-avisynth --enable-swscale --enable-gpl
  
        libavutil     49.12. 0 / 49.12. 0
  
        libavcodec    52. 6. 0 / 52. 6. 0
  
        libavformat   52.23. 1 / 52.23. 1
  
        libavdevice   52. 1. 0 / 52. 1. 0
  
        libswscale     0. 6. 1 /  0. 6. 1
  
        built on Dec  3 2008 01:59:37, gcc: 4.2.4
  
  Input #0, image2, from 'image1.png':
  
  Duration: 00:00:00.16, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Video: png, rgb32, 400x300,  6.00 tb(r)
  
  Input #1, wav, from 'audio1.wav':
  
    Duration: 00:00:11.07, bitrate: 88 kb/s
  
      Stream #1.0: Audio: pcm_u8, 11025 Hz, mono, s16, 88 kb/s
  
  File 'out.mp4' already exists. Overwrite ? [y/N] y
  
  Output #0, mp4, to 'out.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 400x300, q=2-31, 200 kb/s,  6.00 tb(c)
  
      Stream #0.1: Audio: libfaac, 11025 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #1.0 -> #0.1
  
  Press [q] to stop encoding
  
  frame=    1 fps=  0 q=4.1 Lsize=      42kB time=0.17 bitrate=2063.7kbits/s
  
  video:14kB audio:26kB global headers:0.kB muxing overhead 4.894235%

  I have also tried using

  ffmpeg -loop 1 -i "image1.png" -i "audio1.wav" -t 11 out.mp4

  This command does create an mp4 of 11 seconds but the audio is still cut off at 10 seconds.

  Why is the audio being cutoff at 10 seconds ?

  Thanks,
  Gary

• why type casting on non-pointer struct give syntax error

  31 mars 2016, par Sany Liew

  I am using Visual C++ express 2008 try to compile code similar to below :

  no problem

  {
  
    ...
  
    AVRational test = {1, 1000};
  
    ...
  
  }

  but has problem when it is as below :

  {
  
    ...
  
    AVRational test = (AVRational){1, 1000};
  
    ...
  
  }

  gave errors :

  1>..\..\..\projects\test\xyz.cpp(1139) : error C2059: syntax error : '{'
  
  1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing   ';' before '{'
  
  1>..\..\..\projects\test\xyz.cpp(1139) : error C2143: syntax error : missing ';' before '}'

  where AVRational (ffmpeg.org library) is defined as :

  typedef struct AVRational{
  
      int num; ///< numerator
  
      int den; ///< denominator
  
  } AVRational;

  FFmpeg come with some pre-define value such as

  #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}

  which is used as below

  av_rescale_q(seek_target, AV_TIME_BASE_Q, pFormatCtx->streams[stream_index]->time_base);

  will failed to compile on Visual C++ express 2008

  It seem like the same code will be compiled with no error/warning on gcc compiler. Why I get this error on VC++ ? Is it a C/C++ standard way to do casting on struct value ? Anyway I can avoid this error while still able to use the defined AV_TIME_BASE_Q ?

• FFMPEG and Mencoder building screenshot returns 0 size images

  12 avril 2014, par Genus

  I have a script and it used to work fine but suddenly it stopped working and giving me zero size images as screenshot after video convert.

  here is the command for video screenshot.

  $cmd = $GLOBALS["paths"]["ffmpeg"]." -y -i ".$file." -f mjpeg -r 1 -ss ".$time." -vframes 1 -an ".$tmpdir."/00000001.jpg 2>&1";
  
      exec($cmd,$results);

  Debug :

  -----------------------------------------------------
  
  
  
  ------------mencoder_and_fmpeg.php SCREENSHOT -------
  
  
  
  -----------------------------------------------------
  
  
  
    COMMAND: ffmpeg -y -i /home/TESTING/public_html/vid/6d/ad/29/6dad2946a2ba102.flv -f mjpeg -r 1 -ss 14.48 -vframes 1 -an /home/TESTING/public_html/scr/42/3a/92/00000001.jpg 2>&1
  
  
  
    FFmpeg version SVN-r16244, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
  
  
    configuration: --disable-mmx --enable-shared --enable-libvorbis --enable-gpl --enable-swscale --enable-pthreads --disable-static --disable-demuxer=v4l --disable-demuxer=v4l2 --enable-libtheora --enable-gpl --enable-libspeex --enable-libmp3lame --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libamr-nb --enable-libamr-wb --enable-nonfree --enable-libxvid
  
    libavutil     49.12. 0 / 49.12. 0
  
    libavcodec    52. 7. 0 / 52.108. 0
  
    libavformat   52.23. 1 / 52.92. 0
  
    libavdevice   52. 1. 0 / 52. 2. 3
  
    libswscale     0. 6. 1 /  0.12. 0
  
  
  
    built on Apr  9 2011 22:48:41, gcc: 4.1.2 20080704 (Red Hat 4.1.2-50)
  
    built by Admin-Ahead Server Technologies FFmpeg installer v5.0.6b
  
    Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 10.92 (131/12)
  
    Stream mapping:
  
    Stream #0.0 -> #0.0
  
  
  
    Press [q] to stop encoding
  
    ffmpeg: symbol lookup error: ffmpeg: undefined symbol: frame_hook_process