[FFmpeg-user] mp4 concatenation (muxer) problems -- invalid output?

John Hawkinson jhawk at MIT.EDU
Tue Feb 21 02:54:43 EET 2017

Thanks, Carl Eugen. It looks like -r ntsc is perhaps a more user-friendly
alias and produces the same output as -r 30000/1001 (same md5 checksum).

> The "video" was encoded by a hardware encoder, the "held frame" by
> x264, you cannot concatenate them.

When you say "cannot concatenate" do you mean with "-c copy" or not at all?
Then what are my options instead, specifically what's the least processor-
intensive option here?

I have the same problem using the -r ntsc "held frame" as I did before.
Also, if I convert the files to mpegts, I seem to get the
same problems, although I have not broken this out rigorously.
> (ffprobe output is completely irrelevant here, it does not show
> technical details.)

Is there a better diagnostic tool I should be using to ascertain
what should be concatenate-able [concatenable?]?


--jhawk at mit.edu
  John Hawkinson

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