Recherche avancée

Sur d’autres sites (3747)

• avcodec/cinepakenc : drop coded_frame init

  7 mai 2014, par Michael Niedermayer

  avcodec/cinepakenc : drop coded_frame init
  Fixes const being lost warning
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/cinepakenc.c

• Merge video files using Concat filter in FFmpeg

  8 juillet 2013, par vijay

  I am using FFmpeg to concat video files of different codecs in my android application.
  I read the FFmpeg documentation and tried the following things.

  1. ffmpeg -i "concat:input1.mpg|input2.mpg" -c copy output.mp4 (works only for mpg files)

  2. ffmpeg -i 1.mp4 -c copy -bsf dump_extra 1.ts
  
     ffmpeg -i 2.mp4 -c copy -bsf dump_extra 2.ts
  
     ffmpeg -i "concat:1.ts|2.ts" -c copy output.mp4 (works for mp4 files)

  I tried both the methods for 3gp files but it throws an error in stream filters.The second method stores the .ts files in device that should not be done and also i lost the quality of the video.

  When i googled it out i found that FFmpeg provides a way to concat files with different codecs.So i tried the following command to this in a single step without storing files in device.

  fmpeg -i 1.mp4 -i 2.3gp -i 3.mpg -filter_complex '[0:0] [0:1] [1:0] [1:1]
  
   [2:0] [2:1] concat=n=3:v=1:a=1 [a] [v] ' -map '[a]' -map '[v]' -c copy output.mp4 

  It throws the following exception :

  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 25 2013 20:34:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: 
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  F.mp4: No such file or directory
  
  tsk@tsk:~/Android/Backups/android-ffmpeg-x264/Project/jni$ ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex '[0:1] [0:0] [1:1] [1:0] concat=n=2:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' output.mp4
  
  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 25 2013 20:34:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: 
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      creation_time   : 1970-01-01 00:00:00
  
    Duration: 00:00:04.04, start: 0.000000, bitrate: 1457 kb/s
  
      Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1454 kb/s, SAR 349:320 DAR 349:240, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      creation_time   : 1970-01-01 00:00:00
  
    Duration: 00:00:04.04, start: 0.000000, bitrate: 1498 kb/s
  
      Stream #1:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1495 kb/s, SAR 349:320 DAR 349:240, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
  Stream specifier ':1' in filtergraph description [0:1] [0:0] [1:1] [1:0] concat=n=2:v=1:a=1 [v] [a] matches no streams.

  I googled out but found no solution yet.

  Any help is appreciated.

• lavfi/delogo : avoid propagation of rounding errors in chroma planes

  2 juillet 2013, par Jean Delvare

  lavfi/delogo : avoid propagation of rounding errors in chroma planes
  When operating on subsampled chroma planes, some rounding is taking
  
  place. The left and top borders are rounded down while the width and
  
  height are rounded up, so all rounding is done outward to guarantee the
  
  logo area is fully covered.
  The problem is that the width and height are counted from the
  
  unrounded left and top borders, respectively. So if the left or top
  
  border position has indeed been rounded down, and the width or height
  
  needs no rounding (up), the position of the the right or bottom border
  
  will be effectively rounded down, i.e. inward.
  The issue can easily be seen with a yuv240p input and
  
    -vf delogo=45:45:60:40:show=1 -vframes 1 delogo-bug.png
  
  (or virtually any logo area with odd x and y and even width and
  
  height.) The right and bottom chroma borders (in green) are clearly
  
  off.
  In order to fix this, the width and height must be adjusted to include
  
  the bits lost in the rounding of the left and top border positions,
  
  respectively, prior to being themselves rounded up.
  Signed-off-by : Jean Delvare <khali@linux-fr.org>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavfilter/vf_delogo.c
  • [DH] tests/ref/fate/filter-delogo