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• ffmpeg - Merge back frames to a video with the same encoding

  24 septembre 2019, par Vuwox

  I have a video encoded using H264 at 23.98 fps, for a duration of 00:00:06.42.

  I extracted the frames from that video, and then I processed those images one-by-one. Now I want to put them back together as a video, but I want to be the same as the source video (same duration, same audio, etc).

  Whatever I tried gives something different. The duration is always greater (around 00:00:06.59), the audio seems to be up to the end of the video (as expected), but the frame are not encoded properly, and they seems to freeze at the end and the audio continue.

  The one that look almost the same except the freeze at the end look like this :

  ffmpeg -i input.mov \
  
         -pattern_type glob -i 'result_*.tif' 
  
         -map 1 -map 0:a \
  
         -map_metadata 0 \
  
         -map_metadata:s:v 0:s:v \
  
         -map_metadata:s:a 0:s:a \
  
         output.mov

  Where I use the metadata and the audio from the input video, and use the frames from my second input.

  EDIT : As suggested here the details of the source video.

  ffmpeg version 2.8.15 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-28)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    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, mov,mp4,m4a,3gp,3g2,mj2, from 'Transparent.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2019-09-17 22:06:44
  
    Duration: 00:00:06.42, start: 0.000000, bitrate: 47798 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 113 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-09-17 22:06:44
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 47541 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 48k tbc (default)
  
      Metadata:
  
        creation_time   : 2019-09-17 22:06:44
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
        timecode        : 00:00:00:00
  
      Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-09-17 22:06:44
  
        handler_name    : Core Media Data Handler
  
        timecode        : 00:00:00:00
  
  At least one output file must be specified

• Revert "rtpenc_chain : Don’t copy the time_base back to the caller"

  29 mai 2014, par Martin Storsjö

  Revert "rtpenc_chain : Don’t copy the time_base back to the caller"
  While it strictly isn’t necessary to copy the time base (since
  
  any use of it is scaled in ff_write_chained), it still is better
  
  to signal the actual time base to the caller, avoiding one
  
  unnecessary rescaling. This also lets the caller know what the
  
  actual internal time base is, in case that is useful info
  
  for some caller.
  This reverts commit 397ffde115f4e0482a007b672f40457596cebfc4.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtpenc_chain.c

• Crop black padding and resize back to original 1920x1080

  1er juin 2020, par Satish Kumar

  I have video of resolution 1920x1080 (16:9 aspect ratio). When played its padded with black box on all sides. How to remove the black boxes to get the 1920x1080 video ?

  



  Screenshot of video

  



  Below the audio and video details :

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Maths Logic.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.19.102
  Duration: 00:43:11.24, start: 0.000000, bitrate: 1475 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1405 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
    Metadata:
      handler_name    : SoundHandler