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• Is there a way to hide text or an image behind a video with ffmpeg ?

  27 juillet 2021, par Jesse Hix

  The following command puts an image in the upper left hand corner that flashes every 2 or so seconds.
ffmpeg -i input.mp4 -loop 1 -i test.jpeg -filter_complex "[0][1]overlay=enable='if(gt(n,0),not(mod(n,20)),0)':shortest=1[v]" -map "[v]" -map 0:a ? -c:a copy output.mp4

  


  The following command puts text in the center of a video and depending on the @.05 make it invisible or visible.
ffmpeg -i input.mp4 -vf "drawtext=fontfile=/path/to/font.ttf:text='Stack Overflow':fontcolor=white@.05:fontsize=24:x=(w-text_w)/2:y=(h-text_h)/2" -codec:a copy output.mp4

  


  My question is can I overlay the image with the video and if so how do I "see" that the picture is there ? Or how can I "see" the invisible text on the video ?

  


• FFMpeg + iOS - Memory Leak

  4 octobre 2019, par Daneo

  I’ve managed to set up RTSP streaming through the use of FFMpeg.
  However, I’m plagued by some memory leaks, some of which I’ve managed to solve, but the profiler keeps reporting some other.

  I’ve posted the related class on Github, and would be very grateful if you could provide a hand in this because I don’t know where to look anymore.

  The profile reports the leak when closing the screen, so this means it is leaking something during the deallocation phase.

  Leaks :
  

• FFMPEG - 60fps to 30fps with burn in in one line

  23 juillet 2021, par OliC

  Ive been trying to get this work for a little while now and I think im just lacking some knowledge in something.

  


  I am basically trying to convert a 60fps video down to 30fps and burn in timecode all at the same time.

  


  So far I have

  


  ffmpeg -y -r 60  -i IN.mov -pix_fmt yuv420p -timecode 10:03:13:27 -filter:v fps=30 -vf "[in]drawtext=fontfile='C\:/Windows/Fonts/arial.ttf': timecode='10\:03\:13\:27':timecode_rate=30:x=((w-text_w)/2)/3:y=((h-text_h)-h)+text_h:fontsize=24:fontcolor=white:box=1:boxcolor=black:boxborderw=5[out]"  -r 30 OUT.mov


  


  I convert the 60 fps tc to 30 by hand for some of the values (eventually move this into python)

  


  It all seems to work fine until you take a look at the burn in which seems to be counting at 30 but counting up in 2's. I can tell its something to do with the 60/30 conversion as obviously we are halving the frames. Im really trying to avoid multiple calls and 'temp' files.

  


  If anyone could talk me through what im doing wrong and educate me a little that would be awesome

  


  Thanks in advance guys