I'm using the concatenation technique of creating files.txt and adding one line per file beginning with "file ".

 ffmpeg -f concat -safe 0 -i files.txt -c copy result.mp4

However I find that if any of these files is one that I created previously using ffmpeg from a series of JPEGs, even if the resolution and frame rate are perfect, for some reason the result.mp4 will not contain this no-audio file.

What is the solution?


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