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• FFMPEG crop video output is black screen, sound is good [on hold]

  11 janvier 2016, par Oum Alaa

  I cropped a video using ffmpeg command line, the output is black screen, the sound is clear and good :

  ffmpeg -i Original.mp4 -t 00:00:29 -vf "crop=634:300:0:60" Done.mp4

  ffmpeg version :

  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.1, Copyright (c) 2000-2014 the Libav developers

  built on Mar 16 2015 13:26:50 with gcc 4.6.3

  video information :

  mediainfo '--Inform=Video;%Width%x%Height%' Original.mp4
  
  634x360

  Thanks in advance

• ffmpeg - produces corrupted file

  1er mai 2015, par pomegranate

  I have a mp4 file that I need to convert to avi to run a matlab script on. This script strips the file of any audio, so then I have to merge it back with the audio and then reconvert the avi to mp4. I’m doing this in a number of steps, and am uncertain at which point I’m screwing the commands up... basically, the final mp4 file I create it corrupted and cannot be played in quicktime (though it does work in VLC).

  Here are the steps I am taking :

  1) ffmpeg -i original.mp4 -acodec copy -vcodec copy original.avi
  
     This converts mp4 to avi.
  
  2) ffmpeg -i original.mp4 -acodec copy original.aac
  
     This gets the audio from the mp4.
  
  3) Run matlab script, which produces new-no-sound.avi
  
  4) ffmpeg -i new-no-sound.avi -i original.aac -c:v copy -c:a aac -strict experimental new-with-sound.avi
  
     This merges the old audio with the new avi file
  
  5) ffmpeg -i new-no-sound.avi -c:v libx264 -crf 19 -preset slow -c:a libfaac -b:a 192k -ac 2 final-version.mp4
  
     This converts the new merged file to mp4.

  Here’s the ffmpeg -i from the original.mp4 :

    Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2mp41
  
  encoder         : Lavf54.29.104
  
  Duration: 00:00:01.77, start: 0.000000, bitrate: 9920 kb/s
  
  Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 9978 kb/s, 59.94 fps, 59.94 tbr, 2997 tbn, 2997 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 52 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler

  And here is it for new-no-sound.avi :

  Input #0, avi, from 'new-no-sound.avi':
  
  Duration: 00:00:02.12, start: 0.000000, bitrate: 1325789 kb/s
  
  Stream #0:0: Video: rawvideo, bgr24, 1280x720, 1336298 kb/s, 59.94 fps, 59.94 tbr, 59.94 tbn, 59.94 tbc

  Finally, here it is for final-version.mp4

  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf55.48.100
  
  Duration: 00:00:02.21, start: 0.023220, bitrate: 2117 kb/s
  
  Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 1280x720, 2108 kb/s, 59.94 fps, 59.94 tbr, 11988 tbn, 119.88 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 43 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler

  Any advice for where I might be going wrong ?

• Different brightness merging multiple BMP files into MP4 using ffmpeg

  14 février 2023, par jamana

  I want to edit a small video frame/image by image without losing quality (or without losing much of it). I have used ffmpeg to split into images using the following line :

  


  ffmpeg -i test.mp4 $filename%%03d.bmp

  


  This worked fine. I tried merging the images back using several lines including :

  


  ffmpeg -re -f image2 -framerate 30 -i $filename%%03d.bmp -c:v prores_aw -pix_fmt yuv422p10le test.mkv

  


  Though, this results in a difference between brightness/contast between original and merged videos. The merged file would be a bit darker (you have to look close) than original file. What can I do to fix this ?

  


  Thanks for your time.