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<mishehu>
Greets folks. I've been running some tests with ffmpeg 4.4.4 + libaom 3.8.1 on two of my machines. One is AMD Ryzen 7 7800X3D 8-Core, the other AMD EPYC 7302P 16-Core, both with amd's hyperthreading equivalent enabled. taking some vob's I have from dvd's I own, and converting them with `-c:v libaom-av1 -crf 25` for output takes around 800 minutes on either machine for a 22 minute episode of futurama,
<mishehu>
but with x264, with crf set to 22, it takes maybe 10 minutes tops. when doing mpeg2 -> av1, it's maybe getting 0.5 fps most of the time without really even pegging a single core. what options should I test with to improve transcoding w/o changing the actual quality of -crf 25 ?
<klaxa>
cryogenic freezing might be an option if you are dead set on using software av1 :^)
<aaabbb>
according to "ffmpeg -h encoder=mpeg1video" the supported framerates are "24000/1001 24/1 25/1 30000/1001 30/1 50/1 60000/1001 60/1 15/1 5/1 10/1 12/1 15/1". but when i do "ffmpeg -i in.mp4 -c:v mpeg1video -vf fps=15 out.mpg" the error it gives is "MPEG-1/2 does not support 15/1 fps". why is this?
<aaabbb>
i can get it to work with -strict -1 of course but it says explicitly that 15 is a supported framerate
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<furq>
framerates outside of that list aren't supported regardless of -strict
<furq>
15 is out of spec but presumably some devices support it
<furq>
what is weird is that -strict normal doesn't work but -strict unofficial does when the docs imply those are the same
<furq>
i guess that's not weird but the docs are confusingly laid out
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<aaabbb>
furq: it's only 15/1 and 24/1 and 25/1 that i need to support, just kinda weird that i have to -strict -1 to get a supposedly officially supported framerate to work
<aaabbb>
furq: strange thing, if i set -b_strategy 2 then it errors with 15/1 even with -strict -1, but not with -b_strategy 1 or -b_strategy 0
<furq>
it's not officially supported by the spec
<aaabbb>
furq: so -h encoder=mpeg1video lists framerates not supported by the spec?
<furq>
yes
<aaabbb>
why would -b_strategy matter? "ffmpeg -f lavfi -i color=r=15 -c:v mpeg1video -strict -1 -b_strategy X -f null -" works only if X=0 or X=1
<aaabbb>
and libmpeg3 also has 15/1. that explains why supported framerates listed 15/1 twice, i was wondering about that
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<mishehu>
klaxa: I don't know if I have any other option. the ryzen 7 machine has a [AMD/ATI] Navi 22 [Radeon RX 6700/6700 XT/6750 XT / 6800M/6850M XT] (rev c0) (specifically this is the 6850 XT). but I use amdgpu and don't want to touch proprietary drivers.
<mishehu>
and the epyc server has no gpu of any value in it.
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<evilscreww>
aaabbb: hey.
<aaabbb>
hi
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<HiccupJul>
I have some videos I want to seek through, in order to take lossless screenshots, but the format doesn't support seeking. So how can I convert it losslessly to AVI?
<galad>
what's the current format of the video?
<HiccupJul>
thp
<HiccupJul>
although it should be possible to convert any format to AVI losslessly, right? or to some lossless format
<HiccupJul>
because i could e.g. screenshot each frame of the original video, then combine that into an avi, and that would result in two videos with identical pixels
<galad>
well, yes
<HiccupJul>
just not sure what the parameter is. -crf 0 doesn't seem to be it
<HiccupJul>
for some reason `ffmpeg -i autodemoA.thp -crf 0 autodemoA.avi` produces a significantly degraded video
<HiccupJul>
so apparently "-crf 0" does not get you a lossless conversion, unlike what some web results say?
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<galad>
the default encoder is probably not h.264 for avi
<galad>
just use .mp4 or .mkv
<HiccupJul>
not sure what you mean
<HiccupJul>
mp4 is lossy, isn't it?
<galad>
mp4 and mkv are containers, they can contain almost everything
<galad>
you are probably trying to encode in h.264 by using x264 set to crf 0
<galad>
so mp4 and mkv and good choices
<HiccupJul>
so `ffmpeg -i autodemoA.thp -crf 0 autodemoA2.mp4` ?
<HiccupJul>
doing that, and capturing the same frame of each, results in two non-identical images
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<RhineDevil>
I'm using this command for adding an audio track: ffmpeg -i "$1" -i "$2" -map 0 -map 1 -c:v copy -c:a copy "$3", however this adds the audio track as last track
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<RhineDevil>
The original file has a video track, 2 audio track and 8 subtitles tracks
<RhineDevil>
For a total of 11 tracks (12 with this one)
<RhineDevil>
How could I add this track as id 0:3 ?
<another|>
-map 0:v -map 0:a -map 1:a -map 0:s
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<RhineDevil>
another|: instead of -map 0 -map 1?
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<another|>
yes
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<iqualms>
Is anyone able to encode NTSC mxf_d10?
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<bray90820>
Not sure if this is teh right place to ask this but does nayone have an MP4 file with AAC audio that I can use for testing