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• Get correct framerate from ffmpeg

  20 septembre 2015, par user3249421

  Good day,

  I have a problem. I need get correct framerate from ffmpeg libs..

  I tried use

  pFormatCtx->streams[videoStream]->avg_frame_rate.num

  return of avg_frame_rate is 2997. But when I dumped meta info, I got :

  Input #0, avi, from '/test.avi':
  
    Metadata:
  
      encoder         : MEncoder SVN-r33883(20110719-gcc4.5.2)
  
    Duration: 00:49:47.70, start: 0.000000, bitrate: 1294 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 856x480 [SAR 1:1 DAR 107:60], 1090 kb/s, SAR 491520:492521 DAR 8192:4603, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 192 kb/s
  
  2015-09-20 15:47:02.377 TV3[21607:769601] ready to start audio

  sample rate is : 23.98fps. What value is correct and why are they different ?

• 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%

• ffmpeg Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  24 septembre 2015, par and93hil

  So I am getting some errors wehn concerting with ffmpeg, here is the complete output, what have i specified wrongly ?

  command

  /usr/bin/ffmpeg -i /home/user/144310492683541.avi -vcodec flv -acodec libmp3lame -s 854x480 -preset medium -f mp4 -b:v 512000 -minrate 512000 -maxrate 512000 -b:a 128000 -minrate 128000 -maxrate 128000 -r 25 -ar 22050 /home/user/files/videos/2015/09/24/144310492683541.mp4

  ffmpeg output

  ffmpeg version N-74748-gbaeb8f5 Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
  libavutil 54. 31.100 / 54. 31.100
  
  libavcodec 56. 59.100 / 56. 59.100
  
  libavformat 56. 40.101 / 56. 40.101
  
  libavdevice 56. 4.100 / 56. 4.100
  
  libavfilter 5. 40.100 / 5. 40.100
  
  libavresample 2. 1. 0 / 2. 1. 0
  
  libswscale 3. 1.101 / 3. 1.101
  
  libswresample 1. 2.101 / 1. 2.101
  
  libpostproc 53. 3.100 / 53. 3.100
  
  Input #0, avi, from '/home/user/144310492683541.avi':
  
  Metadata:
  
  encoder : Lavf56.22.100
  
  Duration: 00:01:36.13, start: 0.000000, bitrate: 3447 kb/s
  
  Stream #0:0: Video: mpeg4 (Simple Profile) (DIVX / 0x58564944), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 3871 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, fltp, 11 kb/s
  
  Codec AVOption preset (Set the encoding preset (cf. x264 --fullhelp)) specified for output file #0 (/home/user/files/videos/2015/09/24/144310492683541.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  [flv @ 0x2d74100] Either both buffer size and max rate or neither must be specified
  
  Output #0, mp4, to '/home/user/files/videos/2015/09/24/144310492683541.mp4':
  
  Metadata:
  
  encoder : Lavf56.22.100
  
  Stream #0:0: Video: flv1, none, q=2-31, 128 kb/s, SAR 1280:1281 DAR 0:0, 25 fps
  
  Metadata:
  
  encoder : Lavc56.59.100 flv
  
  Stream #0:1: Audio: mp3, 0 channels, 128 kb/s
  
  Metadata:
  
  encoder : Lavc56.59.100 libmp3lame
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (mpeg4 (native) -> flv1 (flv))
  
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height