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• avcodec/idctdsp : Only try to initialize xvid idct if it is used

  20 mai, par Andreas Rheinhardt

  avcodec/idctdsp : Only try to initialize xvid idct if it is used
  This allows to remove checks from ff_xvid_idct_init()
  
  (and also the AVCodecContext* parameter).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/idctdsp.c
  • [DH] libavcodec/xvididct.c
  • [DH] libavcodec/xvididct.h

• avfilter/vf_overlay : Don't perform UB pointer arithmetic

  4 juin, par Andreas Rheinhardt

  avfilter/vf_overlay : Don't perform UB pointer arithmetic
  This happens when the pixel format of the output does not
  
  have an alpha channel. It leads to FATE failures with
  
  the ffmpeg-filter_colorkey, filter-overlay-dvdsub-2397
  
  filter-overlay,
  
  filter-overlay_gbrp_gbrap,nv12,nv21,yuv420,yuv420_yuva420,
  
  yuv420p10,yuv422_yuva422,yuv422p10,yuv444_yuva444,yuv444p10
  
  and sub2video tests when using Clang UBSan.
  Fix this by only performing the pointer arithmetic when
  
  it is going to be used. This can be checked via variables
  
  that compile-time constants due to inlining, so that the
  
  checks are free. Given that the pointer is potentially
  
  used as a function argument, the compiler could elide
  
  the calculation, but not it can. The size of .text decreased
  
  by 1632B with GCC 14 and by 1392B with Clang 19 (both -O3).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavfilter/vf_overlay.c

• Why am I getting an error for stream #0.1 ?

  30 juillet 2014, par Rob Avery IV

  I’m converting videos using ffmpeg-php. Here is my code :

      // Set our source file
  
      $srcFile = $uploadFilm.".".$film_type;
  
      $destFile = $uploadFilm;
  
      $ffmpegPath = "ffmpeg";
  
  
  
      // Create our FFMPEG-PHP class
  
      $ffmpegObj = new ffmpeg_movie($srcFile);
  
  
  
      // Save our needed variables
  
      $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth());
  
      $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight());
  
      $srcFPS = $ffmpegObj->getFrameRate();
  
      if($ffmpegObj->hasAudio()){
  
          $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);
  
          $srcAR = $ffmpegObj->getAudioSampleRate();
  
      }else{
  
          $srcAB = 0;
  
          $srcAR = 0;
  
      }
  
  
  
      // Call our convert using exec()
  
      //$command = $ffmpegPath . " -i " . $srcFile . " -ar " . $srcAR . " -ab " . $srcAB . "k -f flv -s " . $srcWidth . "x" . $srcHeight . " " . $destFile;
  
      //$command = "whoami";
  
      $command = $ffmpegPath . ' -i ' .'"'. $srcFile . '" -ar ' . $srcAR . ' -ab ' . $srcAB . 'k -f flv -s ' . $srcWidth . 'x' . $srcHeight . ' "' . $destFile . '" 2>&1';
  
      $outputCommand = array();
  
      $status = 1;
  
      exec($command, $outputCommand, $status);

  The output gives out this error at the end :

  Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

  I know that both $srcAB and $srcAR have values because this is the command this being ran :

  ffmpeg -i source -ar 48000 -ab 160k -f flv -s 1920x1080 destination

  Of course, after the command is executed, the "convert video" has a size 0, which means it didn’t convert it.

  What am I missing here ?

  EDIT : Here is my full output :

  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jul 18 2014 08:41:45 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3)
  
    configuration: --enable-libmp3lame --disable-mmx --enable-shared
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/path/to/file/bbb_sunflower_1080p_30fps_normal.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      creation_time   : 2013-12-16 17:44:39
  
      title           : Big Buck Bunny, Sunflower version
  
      artist          : Blender Foundation 2008, Janus Bager Kristensen 2013
  
      comment         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
  
      genre           : Animation
  
      composer        : Sacha Goedegebure
  
    Duration: 00:10:34.60, start: 0.000000, bitrate: 3481 kb/s
  
      Stream #0.0(und): Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 2998 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:39
  
      Stream #0.1(und): Audio: mp3, 48000 Hz, 2 channels, s16, 160 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:42
  
      Stream #0.2(und): Audio: ac3, 48000 Hz, 6 channels, s16, 320 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:42
  
  [buffer @ 0x2231e20] w:1920 h:1080 pixfmt:yuv420p
  
  Output #0, flv, to '/path/to/file/bbb_sunflower_1080p_30fps_normal.flv':
  
      Stream #0.0(und): Video: flv, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:39
  
      Stream #0.1(und): Audio: libmp3lame, 48000 Hz, 6 channels, s16, 160 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:42
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height