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• ffmpeg rotate, trim, and crop video

  1er novembre 2017, par 1234567

  ffmpeg rotate, trim, and crop video

  I am trying following command

  "-y", "-i", j, "-ss",15, "-t", 40
  
                      ,"-filter_complex", "transpose=1,crop=" +
  
                     40 + ":" + 20 + ":" + 100 + ":" + 100, "-c:a", "copy", "-preset", "ultrafast",out

  this command works but creates a black video

  If remove the transpose from command it works fine

  second part is I want to remove a part of video and rotate and crop that video

  for example in a video of 1 min 25 seconds and i want to remove a part from 40-50 sec I am trying this command

  "-y", "-i", j,
  
                        "-filter_complex", "transpose=1," +
  
                          "[0:v]trim=start=40:end=50,setpts=PTS-STARTPTS[b];" +
  
                          "[a][b]concat[c];[c][d]concat[out1]" +
  
                          "crop=" + 40 + ":" + 20 + ":" + 100 + ":" + 100,
  
                          "-c:a", "copy", "-preset", "ultrafast",out

  the error for this is

  too many input specified for the trim filter 

  I have referred this question for removing middle part of video
  https://superuser.com/questions/681885/how-can-i-remove-multiple-segments-from-a-video-using-ffmpeg

• FFmpeg - What does non monotonically increasing dts mean ?

  24 mars, par Mukund Manikarnike

  Observations - Part - I

  



  I saw a suggestion elsewhere to run the following command to see if there's something wrong with my .mp4.

  



  ffmpeg -v error  -i ~/Desktop/5_minute_sync_output_15mn.mp4 -f null - 2>error.log


  



  When I run the above command, I see a whole bunch of the logs on the lines of what's shown below.

  



  


  Application provided invalid, non monotonically increasing dts to
 muxer in stream 0 : 15635 >= 15635

  


  



  This, from searching and reading up quite a bit, I understand that the decoding timestamp isn't in sequential order.

  



  Observations - Part II

  



  But, inspecting the frames of the same mp4 using the following command and some post processing, I don't see pkt_dts within the frames_info json being out of order for either of the video or audio streams.

  



  ffprobe -loglevel panic -of json -show_frames ~/Desktop/5_minute_sync_output_15mn.mp4


  



  This makes me doubt my initial understanding in Observations - Part - I

  



  Are these 2 things not related ?
Any help on this will be greatly appreciated.

  


• Split filiename with ffmpeg and reverse order

  28 septembre 2020, par sobo

  I reverse video files in a batch using ffmpeg.

  


  What I would like to do now is :

  


  

  1. Reverse only the files with a "-" in the name.

  


  2. Rename these files by swapping the part before "-" with the part after it. Like "abc-def" becomes "def-abc".

  


  


  Any ideas ?

  


  Thanks !

  


  UPDATE :

  


  Sorry for the wrong title/topic. Am I supposed to create a new post ? Or edit the title ?

  


  I tried the following now to find the files. For some reason it always succeeds, no matter which name :

  


  for %%a in ("videos/*.mp4") do (
    echo %%a|find "-" >nul
    if %errorlevel%==0 (
        echo found
    )
)