[Libav-user] Incorrect md5 for ogg files after ffmpeg version upgrade
Carl Eugen Hoyos
cehoyos at ag.or.at
Mon May 9 19:56:34 CEST 2016
Dmitry Bogdanov <dmitry.bogdanov at ...> writes:
> ffmpeg -i test.ogg -acodec copy -f md5 -
You are not the first one doing this, but I have to repeat:
No matter what you are trying to test, this is not guaranteed
to produce identical output for different versions of FFmpeg.
(Since this was the issue when discussing this last time:
It is not even guaranteed to produce identical output for
identical versions of FFmpeg if different compilation options
And (as you found out) the output has changed in the past for
legitimate changes (or bugfixes). Similar changes are possible
in the future.
Decoder output is often specified, ie there is a correct output
that can be compared with actual output. To the best of my
knowledge, this is not true for decoders, specific output is
not specified (and not guaranteed by FFmpeg).
> ffmpeg version 2.2 Copyright (c) 2000-2014 the FFmpeg developers
Unrelated: Note that only current FFmepg git head is supported
Feel free to explain what you are trying to test. Please
consider to add what kind of bugs you already found with your
test or what kind of bugs you would have found if you had
(already) used the test.
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