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• Strange "pause" in video after concatenation of two mp4 videos

  3 octobre 2016, par user606521

  I am concatenating two mp4 videos. The problem is that first video (intro.mp4) lasts 5 seconds, second video (output.mp4) lasts 2 seconds and video created by concatenating them lasts 9 seconds (and should last 5+2 = 7 seconds). In final.mp4 video the last frame from first video (intro.mp4) i shown for additional 2 seconds before second video (output.mp4) is played. It looks like a lag when watching video. What I am doing wrong ?

  list.txt :

  file 'data/intro.mp4'
  
  file 'output.mp4'

  command :

  ./bin/ffmpeg -f concat -i list.txt -c copy final.mp4

  output :

  ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f8a6a80e600] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'list.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 1296 kb/s
  
      Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x540, 1163 kb/s, 23.98 fps, 23.98 tbr, 11988 tbn, 47.95 tbc
  
      Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 133 kb/s
  
  [mp4 @ 0x7f8a6c006a00] Codec for stream 0 does not use global headers but container format requires global headers
  
  [mp4 @ 0x7f8a6c006a00] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, mp4, to 'final.mp4':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 960x540, q=2-31, 1163 kb/s, 23.98 fps, 23.98 tbr, 11988 tbn, 11988 tbc
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 133 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f8a6a80e600] Auto-inserting h264_mp4toannexb bitstream filter
  
  frame=  258 fps=0.0 q=-1.0 Lsize=     997kB time=00:00:09.84 bitrate= 829.5kbits/s    
  
  video:897kB audio:93kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.634306%

• Faster way of getting number of key frames than "show_frames" in ffprobe ?

  19 novembre 2016, par Will Tower

  I’m making a little in-house utility using ffmpg and ffprobe. Works fine and does what is needed : give a count of the number of key frames in a video file plus some other details.

  Alas, with the large video files this will be used on it can take many seconds for show_frames to return – and I then have to parse the JSON dump of frame data and keep a running count of the total key frames.

  Is there a faster way ? Perhaps it is listed in the "stream" or "format" data dumps and I am not recognizing what it is being called ? I’ve been through the ffmpg and ffprobe docs and didn’t find anything else.

• I have a file that purports to be "uncompressed mov" that I want to convert to raw using ffmpeg

  9 août 2015, par Lyman Hurd

  I am running Ubuntu. Here is what I receive and also cannot play the movie with vlc or totem, however the sender insists that these files play on a Mac using QuickTime. Thoughts as to what might be wrong ?

  ~/bin/ffmpeg -i movie.mov ffmpeg version N-50051-g8d0757e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug  8 2015 18:44:04 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libvpx --enable-libx264 --prefix=/home/lhurd --enable-gpl
  
    libavutil      52. 17.102 / 52. 17.102
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.100 / 54. 63.100
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 38.103 /  3. 38.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  movie.mov: Invalid data found when processing input

  Here’s an "od -c" of the head which at least shows that the file isn’t raw :

  0000000  \0 005 026  \a  \0 002  \0  \0   M   a   c       O   S           X
  
  0000020                                  \0 002  \0  \0  \0  \t  \0  \0
  
  0000040  \0   2  \0  \0  \0   F  \0  \0  \0 002  \0  \0  \0   x  \0  \0
  
  0000060  \0  \0   M   o   o   V   T   V   O   D  \0  \0  \0  \0  \0  \0
  
  0000100  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
  
  0000120  \0  \0  \0  \0   A   T   T   R  \0  \0  \0  \0  \0  \0  \0   x
  
  0000140  \0  \0  \0   x  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
  
  0000160  \0  \0  \0  \0  \0  \0  \0  \0
  
  0000170