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• How to check if a .mp4 file is not corrupt and not missing movie frames or audio segments programmatically

  2 novembre 2019, par forgodsakehold

  With youtube-dl I was able to download quite a couple of .mp4 files. However, I have just discovered, after manually playing some of them, that they are missing movie frames in some parts while still playing audio (so a blank screen is shown), or missing audio while still playing movie frames.

  Hence,
  (1) Why doesn’t youtube-dl detect or warn against such a scenario ? It looks like the movie segments and audio track were merged and .mp4 produced without any warning. Is there a way to configure youtube-dl to detect such cases and redownload the movie ?
  (2) Otherwise, are there other ways to detect such cases programmatically ? (considering that one might have thousands of such .mp4 files and may not be able to manually go thru all of them ?) A solution with FFmpeg or php will be appreciated.

• FFMPEG : Add black frames at start and end of video

  7 novembre 2014, par user3729198

  Im trying to add 10 second of black frames to the beginning of my clip and 30 seconds of black frames at end of clip. This is what I got so far.

  ---

  ffmpeg -i XX.mp4 -vf "
  
  color=c=black:s=720x576:d=10 [pre] ;
  
  color=c=black:s=720x576:d=30 [post] ;
  
  [pre] [in] [post] concat=n=3" -an -vcodec mpeg2video -pix_fmt yuv422p -s 720v576 -aspect 16:9 -r 25 -minrate 30000k -maxrate 30000k -b 30000k output.mpg

  ---

  It works in some cases. But Only on specific material with right "SAR" values. But most of the time I get this error.

  ---

  Input link in1:v0 parameters (size 720x576, SAR 35:24) do not match the corresponding output link in0:v0 parameters (720x576, SAR 1:1)
  
  [Parsed_concat_2 @ 0x7f9853d048c0] Failed to configure output pad on Parsed_concat_2

  ---

  Is there a way to complement my code or another way to do this ?

• FFMPEG trim video resulting not moving videos and black video with audio

  13 juin 2023, par Rafliii

  I tried to trim my video based on start and end time with the following code :

  


  ffmpeg -ss 02:06:30.500 -to 02:06:32.417 -i movie.mp4 -c copy output.mp4

  


  The output video is not moving video and some of them are black videos with audio. What should I do ?

  


  enter image description here

  


  What should I do ?