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• Why the fps of concatenate video file change with old video file ?

  23 juin 2016, par Zuiche

  I have two wmv video file which 25fps.
  I concatenate these video file using ffmpeg command line like this :

  ffmpeg -r 25 -f concat -i 1.txt -c copy output.wmv

  1.txt :

  file 'g:\1.wmv'
  
  file 'g:\2.wmv' 

  It works. But the fps of output.wmv is 30.
  How can I maintain the fps of concatenate video file ?

  UPDATE
  ======Console Output========

  ffmpeg version N-73266-g4aa0de6 Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.9.2 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
  libavutil      54. 27.100 / 54. 27.100
  
  libavcodec     56. 45.101 / 56. 45.101
  
  libavformat    56. 40.100 / 56. 40.100
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 19.100 /  5. 19.100
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.100 /  1.  2.100
  
  libpostproc    53.  3.100 / 53.  3.100
  
  [wmv3 @ 04d452a0] Extra data: 8 bits left, value: 20
  
  [wmv3 @ 04d14d00] Extra data: 8 bits left, value: 20
  
  Input #0, concat, from '1.txt':
  
  Duration: N/A, start: 0.000000, bitrate: 4214 kb/s
  
  Stream #0:0: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 720x576, 4194 kb/s, SAR 16:15 DAR 4:3, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
  Stream #0:1: Audio: wmavoice ([10][0][0][0] / 0x000A), 22050 Hz, mono, flt, 20 kb/s
  
  [asf @ 04d12120] Codec for stream 0 does not use global headers but container format requires global headers
  
  [asf @ 04d12120] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, asf, to 'output.wmv':
  
  Metadata:
  
  WM/EncodingSettings: Lavf56.40.100
  
  Stream #0:0: Video: wmv3 (WMV3 / 0x33564D57), yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 4194 kb/s, 25 fps, 25 tbr, 1k tbn, 25 tbc
  
  Stream #0:1: Audio: wmavoice ([10][0][0][0] / 0x000A), 22050 Hz, mono, 20 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [wmv3 @ 04ce8880] Extra data: 8 bits left, value: 20
  
  frame=  538 fps=0.0 q=-1.0 Lsize=    5723kB time=00:00:21.52 bitrate=2178.5kbits/s  
  
  video:5593kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.206905%

  =========FFprobe Output=========

  ffprobe version N-60456-g4040b56-Sherpya Copyright (c) 2007-2014 the FFmpeg developers
  
  built on Feb  9 2014 06:50:33 with gcc 4.8 (GCC)
  
  [wmv3 @ 050684e0] Extra data: 8 bits left, value: 20
  
  Input #0, asf, from 'output.wmv':
  
  Metadata:
  
  encoder         : Lavf56.40.100
  
  Duration: 00:00:21.52, start: 0.000000, bitrate: 2178 kb/s
  
  Stream #0:0: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 720x576, SAR 16:15 DAR 4:3, 25 tbr, 1k tbn, 1k tbc
  
  Stream #0:1: Audio: wmavoice ([10][0][0][0] / 0x000A), 22050 Hz, mono, flt, 20 kb/s
  
  [wmv3 @ 050684e0] Extra data: 8 bits left, value: 20

• how to remove PTS gap within a file when transcoding with ffmpeg ?

  18 juillet 2017, par jsBaek

  i have a video which is from rtmp streaming.

  Since the broadcasting is on and off frequently,

  the archived file has PTS like below

  (assume that this is sec)

  0—10—20—30—40 120—130—140

  there’s discontinuity between 40 and 120 sec.

  duration of this file must be 60sec since there’s 80sec gap between 40 120.

  but when i transcoded this file, final duration became 140sec with 80sec of pausing parts.

  how can i transcode this file without "not existing" 80 sec so that output file became 60sec without redundant pausing 80 sec.

  i tried "+getpts" or "+igndts" options but they don’t work at all.

• ffprobe - getting file info from pipe

  10 septembre 2024, par Andrey Baryshnikov

  I've got an oog file (it was mixed by sox from two audiostreams recorded by pbx Asterisk) and I'm trying to get file information with ffprobe.
When I use something like

  



  cat %filename%.ogg | ffprobe -i - 


  



  I get invalid file info (Duration : N/A, wrong bitrate and etc.)
When I try

  



  ffprobe -i %filename%


  



  Everything works fine and I get file info.
What could be wrong ? File content ?