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• Rotate video without transcode - problems

  29 décembre 2023, par Tyrone Hirt

  I created an FFMpeg script to rotate -90 some videos, this makes these videos display correctly.

  


  the script is this :

  


  ffmpeg -i input.mp4 -c:v copy -metadata:s:v:0 rotate=-90 output.mp4


  


  The issue is that for some reason all the output files are having variations of 2 frames, which causes me problems when I use these files as Proxy videos in editing programs.

  


  For example, if the original file has a timecode of 00:00:32:12 the output file for some reason will have a timecode of 00:00:32:10.

  


  The problem seems to be occurring because I am working with files with 23,976 fps, because I did a test with a video file with 30 fps and there was no variation in the output file.

  


  How can I fix this problem ?

  


  I've already tried adding -r 23.976 to the code to force the frame rate, but that didn't help either.

  


  The crucial point here is to rotate the video without re-encoding the file, as re-encoding will cause a significant time penalty in my workflow.

  


• does movie filter in ffmpeg 4.3.1 support png format picture

  1er janvier 2021, par TONY

  I use ffmpeg's moive filter to add wartermark on my video.
The str is "const char *filter_descr = "movie=test.png:seek_point=3.2, scale=180 :-1, setpts=PTS-STARTPTS [over] ;[in] setpts=PTS-STARTPTS [main] ;[main][over] overlay=16:16 [out]" ;"
it shows that can't find codec, but if the wartermark picture is bmp ,then it's ok.
I found that the png code exists in ffmpeg, it should support png decoder.

  


• ffmpeg with zoom, combine video & audio

  30 août 2021, par P Jewellery

  I have 4 input,

  


  

  1. Main video (No audio in the video)

  


  2. logo.png (always stay on top right corner)

  


  3. image.jpg (Locate at the end of video, Have different ratio with main video)

  


  4. audio.mp3 (The only audio input)

  


  


  The below code helped me to edit the main video.

  


  for %%a in ("*.mp4") do c:\ffmpeg.exe -i "%%a"  
-filter_complex " 
[0:v]trim=0.13:2.5, setpts=PTS-STARTPTS [v0]; 
[0:v]trim=0.13:2.5, reverse,setpts=PTS-STARTPTS[v1]; 
[0:v]trim=28.5:31, reverse,setpts=PTS-STARTPTS [v2]; 
[0:v]trim=28.5:31,setpts=PTS-STARTPTS [v3]; 
[0:v]tpad=stop_mode=clone:stop_duration=2, trim=0.13:31,setpts=0.5*PTS-STARTPTS [v4];
[0:v]trim=30.95:31,tpad=stop_mode=clone:stop_duration=5,setpts=PTS-STARTPTS [v5]; 
[v0][v1][v2][v3][v4][v5]concat=n=6:v=1:a=0[out]" -map "[out]" "%%~dpnaf.mp4"


  


  However, I want to

  


  


  1. add a logo at top right of the video throughout the whole video.

     


  


  2. add an image.jpg at the end of my edited main video.

     


  


  3. add the audio.mp3 throughout the whole final output video. (duration depends on the video.)

     


  


  4. apply a continuous zoom in for [v0]&[v1] (Since v1 is reverse of v0, after the zooming, ending image of v1 is bigger than starting image of v0, so v0,v1 looks like a smooth zoom in video)

     


  


  


  "scale=2160x2160,zoompan=z='min(max(zoom,pzoom)+0.01,5.0)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=2160x2160",


  


  and a continuous zoom out for [v3] & [v4]

  


  All the about to be able to run through a single bat file.