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I am using kdenlive to create mp4 files.

How do I indicate which image (or which point on the timeline) that will appear as the mp4 file icon when I display the mp4 file in Microsoft File Explorer?

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This question has been answered in a previous post here.

The best way to do it is by using ffmpeg.

If you save the frame of video you want as the thumbnail in .png format, you can use the following command to apply the thumbnail to your file in ffmpeg:

ffmpeg -i INPUT.mp4 -i IMAGE.png -acodec copy -vcodec copy -map 0 -map 1:0 OUTPUT.mp4
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  • Sorry, did not work. After running the ffmpeg command, the video appears as a large traffic cone (this is because I am using VLC media player as my default video viewing app). Any other suggestions? – RobM Jul 7 '18 at 12:16
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Use

ffmpeg -i input.mp4 -i input.png -map 0 -map 1 -c copy -disposition:v:1 attached_pic output.mp4
  • -map 0 and -map 1 will map all streams from both input files (numbered as 0 and 1) into the output file,
  • -c copy will directly copy all streams into the output file (i.e. without transcoding),
  • -disposition:v:1 attached_pic will tag your picture (the videostream #1) as as the embedded cover / thumbnail.
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