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• Is there a way to mux a telemetry track into a mp4 video with ffmpeg ?

  23 décembre 2019, par Emanuele Spatola

  I’m trying to write a tool that read the telemetry track from a gopro video file, process it and write it back in the input file.

  I can extract the telemetry track with this command :

  ffmpeg -y -i GOPR0001.MP4 -codec copy -map 0:m:handler_name:" GoPro MET" -f rawvideo GOPR0001.bin

  But I don’t know if it’s possible to mux the bin file back in the original file.

  Are there other tools other than ffmpeg that allows to do it ?

  Any suggestion would be greatly appreciated :)

• How to properly specify font file for ffmpeg as it's always defaulting to Arial ? [closed]

  21 avril 2024, par Jim Jans

  When calling ffmpeg it keeps defaulting to Arial-MT / Arial-BoldMT even when specifying a font. How do you correctly specify the fontfile ?

  


  When specifying any font it will always default back :

  


  [Parsed_subtitles_0 @ 000001915a83f800] fontselect: (DosisBold, 400, 0) -> ArialMT, 0, ArialMT

  


  I am calling ffmpeg with the following command :

  


  ffmpeg -i input.mp4 -vf subtitles='subtitle.srt':force_style='FontName=DosisBold,Alignment=10,Fontsize=24' output.mp4 -loglevel debug

  


  I have a file called "DosisBold.ttf" in the same folder as ffmpeg. I have already tried FontName=DosisBold.ttf and it also doesn't work. All files are in the same folder as the ffmpeg.exe.

  


  I have converted the .srt file to .ass and specified the font file but it still defaults back to ArialMT.

  


  Format: Name, Fontname, Fontsize {...}
Style: SubStyle,DosisBold,24 {...}


  


  I am using "ffmpeg-n7.0-latest-win64-gpl-7.0", I have tried different versions of ffmpeg (e.g. "ffmpeg-master-latest-win64-gpl") and still no change. Also tried different fonts / font files and it always defaults back to Arial.

  


• FFMPEG Multiple Alpha Overlays

  16 septembre 2018, par AK47

  I have a few videos with alpha channels that I will like to overlay on top of each other. It’s possible to get working with the following command

  ffmpeg -i back.mov -i front.mov -filter_complex overlay -c:v png output.mov

  However if I add another video to this it no longer works

  ffmpeg -i back.mov -i front.mov -i front2.mov -filter_complex overlay -c:v png output.mov

  Does anyone know a way of getting this to work ? or would I have to output the first 2 layers and then run the code again with a new layer ?

  I will have more than 3 layers so looking for the most efficient way.