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• how do I apply watermark on multiple videos in the current directory with ffmpeg

  22 octobre 2017, par Ariane Martins Gomes Do Rego

  Linux + ffmpeg

  I have a folder with 300 videos. I need to apply the same watermark on all these videos, so in the folder I have 300 video files + 1 png file which is my watermark, how do I do this without the system asking to overwrite the files ? how to generate a different name for each output file ? that is at least video1.mp4 video2.mp4 etc...

   ffmpeg -i video.mp4 -i watermark.png -filter_complex 'overlay=10:10' output.mp4

  I found something like that.

  It works without errors, but asks if I want to replace the previous video with the next video to be tagged :

  #!/bin/bash
  
  for f in *.mp4; do ffmpeg -i "$f" -i watermark.png -filter_complex 'overlay=10:10' -strict -2 "$~nf-360p.mp4"; done

  How do I generate a command that has the flag that in each mp4 file processed to apply the watermark of the current directory, gets a different name so that the output files were not overwritten ?

  Thanks.

• ffmpeg -ss then apply filter then concat producing timestamp errors

  6 août 2020, par Bob Ramsey

  Using ffmpeg, I have split a file into multiple parts using -ss. Then I apply a filter to some of the files, then concat the files back together. When I do that, I get : Non-monotonous DTS in output stream 0:0 ; previous : 341334, current : 340526 ; changing to 341335. This may result in incorrect timestamps in the output file. The output file plays, but there are noticeable skips where the files are joined.

  


  Here's how I am splitting the file :

  


  ffmpeg -i full_source.mp4 -ss 0 -to 14.264250 -c copy  01-plain.mp4
ffmpeg -i full_source.mp4 -ss 14.264250 -to 18.435083 -c copy  01-filtered.mp4

ffmpeg -i full_source.mp4 -ss 18.435083 -to 29.988292 -c copy  02-plain.mp4
ffmpeg -i full_source.mp4 -ss 29.988292 -to 31.865167 -c copy  02-filtered.mp4
...
ffmpeg -i full_source.mp4 -ss 0 -to 14.264250 -c copy  10-plain.mp4
ffmpeg -i full_source.mp4 -ss 234.484203 -to 300.000 -c copy  10-filtered.mp4


  


  Then I apply a different drawtext filter on each of the 10 filtered files and save them with a new name, like :

  


  ffmpeg -hide_banner -loglevel warning -y -i 01-filtered.mp4 -filter_complex "drawtext=fontfile=calibri.ttf:fontsize=24:fontcolor=white:x=300:y=500:text='hello world'" -crf 15 01-filtered-complete.mp4


  


  Finally, I join all of the plain and complete files back together like this :

  


  ffmpeg  -f concat -safe 0 -i mylist.txt -c:a copy -c:v copy  outfile.mp4


  


  And that's where the timing error comes in. I've tried adding -vsync drop in the concat command, but that didn't really work either. Same version of ffmpeg does the split, the filter, and the concat. I've tried different versions, everything from 20170519 to one from May 2020 with the same result. Always making sure that all three steps are done by the same version of ffmpeg.

  


  The only thing I can see is that ffprobe shows a duration of 14.27 for 01-plain.mp4 when it should be 14.264250. All of the other files show a similar rounding difference. The files are 23.98 fps. If I do all of my filters in really long command without splitting the file, I can use the more precise numbers with no problem. It just takes 10 times as long. This is all scripted, it happens a couple of hundred times a day and time is money, so I can't take 10 times as long to do each file.

  


  Any ideas ? Thanks in advance !

  


• Révision 17809 : du core introduit des entrees factices dans repertoire dans le tableau...

  3 mai 2011, par cedric -

  On detecte l’absence de repertoire comme une erreur, et on renvoie false.