[FFmpeg-user] Problem in concatenation

[Gabriele Greco]

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> This video was written with an old version of FFmpeg.
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> I suggest you test current FFmpeg git head and report back.
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Current git head works (but the one i had before do not), and release/3.4
works too, any older 3.x versions do not work (the second video is broken).

I'm trying to move my base to release/3.4, but I still do not know what
kind of problem it was! I hope not to introduce too many regressions,
thanks for the support!

--
Bye,
 Gabry