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• how to put a red frame before each video programmatically, when concatenating videos using ffmpeg

  7 février 2023, par Maifee Ul Asad

  To merge files with ffmpeg I'm creating a text file like this :

  


  file 'a.mkv'
file 'b.mkv'
file 'c.mkv'


  


  Then I'm running this command to concat these videos :

  


  ffmpeg -f concat -i file.txt -c copy merged.mkv


  


  But the thing is, I want to put red frame for three seconds in the middle of each video.

  


  Now I can get these videos' frame dimensions and create a video and modify the text file like this :

  


  file 'red.mkv'
file 'a.mkv'
file 'red.mkv'
file 'b.mkv'
file 'red.mkv'
file 'c.mkv'


  


  But this is not a programmatical approach, so is there any way I can concat videos and put red frames for three seconds (before every video) ?

  


  I want to generate that red frame video, on run time.

  


• http: restructure http_connect error handling path

  21 mars 2014, par wm4

  http: restructure http_connect error handling path
  The authstr memory allocations make it annoying to error in the middle
  
  of the header setup code, so apply the usual C error handling idiom to
  
  make it easier to error at any point.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/http.c

• FFMPEG - zoompan image in top left corner

  11 novembre 2020, par user3221592

  I can get zoompan to zoom in a dot in the middle of the frame with the standard :

  


  zoompan=z='min(zoom+0.24,10)':x='(iw/2-(iw/zoom/2))':y='ih/2-(ih/zoom/2)'

  


  but I need the dot to appear in the top left of the frame. I have tried any number of combinations of zooms and 'shifts' and the best I could come up with was :

  


  zoompan=z='min(zoom+0.14,10)':x='(iw/2-(iw/zoom/2))+(728/zoom)':y='ih/2-(ih/zoom/2)+(308/zoom)'

  


  BUT for the first 6 frames the dot 'travels' across the frame. No idea why this might be the case. Also the maths(iw/2-(iw/zoom/2)) just doesn't make sense to me to centre the image, I would have thought it would be (iw-(iw*zoom))/2 ?

  


  This works on any 1980x1080 video and I have attached the sample image that I am using along with the full code

  


  ffmpeg -y -i CHORUS_INTRO_VIDEO3.mov -loop 1 -i CentreDot.png -filter_complex "[1:v]zoompan=z='min(zoom+0.14,10)':x='(iw/2-(iw/zoom/2))+(728/zoom)':y='ih/2-(ih/zoom/2)+(308/zoom)':d=150:s=1920x1080[circleOverlay] ;[0:v][circleOverlay]overlay=0:0" -shortest output.mp4