ChanServ changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.1.1 is released
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<avid>
Does ffmpeg support animated webp?
<avid>
I get errors of the sort "skipping unsupported chunk: ANIM 0B, XMP. Could not find codec parameters for stream 0 (Video: webp, none): unspecified size"
<avid>
that is when running ffplay on an animated webp
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<zelgomer>
is ffmpeg deterministic versus cpu power? e.g., if i use cpu affinity to restrict it to only a few cores, given all other parameters are the same, will it produce the same output as if it had been allowed to run on all cores?
<another|>
it depends™
<another|>
generally speaking, no
<zelgomer>
dang
<K900>
Do you really need your video encoding to be bit-by-bit reproducible?
<another|>
_Are you_ encoding video?
<zelgomer>
yes, i'm encoding video. no, i don't need it to be bit-by-bit reproducible but if it isn't bit-by-bit reproducible then i assume something is sacrificed, either compression or video quality
<K900>
That's not really how it works, no
<K900>
The output will likely be _very close_
<K900>
There just may be subtle differences in things like the exact ordering of blocks in the output or whatever
<K900>
It's extremely unlikely you'll see any practical difference
<zelgomer>
i see. thanks!
<JEEB>
the exact determinism of encoding depends on the components, for example I think x264's frame threading is supposed to be deterministic?
<JEEB>
slice threading on the other hand in x264 is not
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<luqtas>
i'm using Python to call ["arecord", "-r", "48000" etc.] for a camera i'm creating with a Pi Zero 2; do i gain anything performance wise if i use ffmpeg instead of arecord?
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<luqtas>
i'm calling the thing with subprocess.Popen(task, shell=False)
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<luqtas>
since we have a Python package for ffmpeg, i wondered about performance
<luqtas>
i'm running on batteries, by the way
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<BtbN>
I don't expect any notable performance differences for effectively just piping raw pcm to a file, no matter what tool you use
<luqtas>
great!
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<luqtas>
so, i'm using a INMP441 and the record volume is quite low, like i need to put my volume on 100% to hear a decent volume. alsamixer tells me the mic. is at 100% level... do these mics. vary much based on environment to the point always setting a gain when recording is a bad deal?
<luqtas>
i have no idea about audio, sorry if that sounds too un-answerable
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<luqtas>
i.e. augmenting the signal on a noisy environment will be different than a quieter one... i don't like to have a noisy record just because of laziness of post-editing but if you tell me there's a safe range, that probably cuts some man-hours?
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