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• Concatenating videos using concat demuxer in FFMPEG is finished but video is lost in second video ?

  3 octobre 2019, par Gopinathan B

  Used concat demuxer in FFMPEG code to concat videos :-

  cmd = arrayOf("-y", "-f", "concat", "-safe", "0", "-i", textFile!!.path, "-c:v", "libx264", "-crf", "23", "-preset", "ultrafast", "-c:a", "copy", outputFile.path)

  After concatenate finished, the video one played correctly has both audio & video but video two - video is missing has only audio. Output file has size & time duration including two videos.

  The textFile contains :-

  file '/path/to/file1'
  
  file '/path/to/file2'

  Used absolutePath for two mp4 video files.

  Tryed this FFMPEG concat video finished but the video missing. But no solution to my problem.

  Anything I am missing in the command.

• How to resize video but do not stretch/modify original video using ffmpeg [migrated]

  8 mars 2023, par Kujo Ludin

  Im pretty bad at video editing/property terms. Sorry in advance.

  


  Green = Input video
Red = Output video

  


  Sorry if this doesnt make sense. But can this be possibly achieved ?

  


  I tried searching for solutions in google, alas i need help in SO

  


• Converting Raw video data to a good quality compressed video using ffmpeg [closed]

  12 janvier 2013, par Deepak Bhatia

  I have a raw video data of size 10 MBytes but when I convert the same to MPEG4 Video, its size becomes 20 MBytes. I am using ffmpeg 1.1.

  Why the size is increasing on using MPEG4 Encoder for compressing the raw video ?

  Thanks in advance.

  Deepak Bhatia