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<jspr78>
Hey folks, I'm trying to encode externally created Vulkan images using nvenc. I used av_hwframe_transfer_data to do the Vulkan -> CUDA copy, but it's taking too long. Is there a zero-copy way to do this?
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<clime>
Hello, does anyone know if mp4 format contains PCR(-like) information?
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<galad>
in mp4 you either have a complete index with all the timing info at the begin or end, or a fragmented index with the timing info for a specific segmented in fragmented files
<JEEB>
PCR is separate from DTS/PTS (CTS)
<JEEB>
"global program time line", I guess?
<JEEB>
probably was more useful when you had to generate analog signal out of the input
<JEEB>
since you could follow PCR to make sure that you should have all required data and have an overall clock
<JEEB>
clime: what's the use case just to know?
<galad>
yup, but there isn't such thing in mp4 from what I know
<JEEB>
yea, I think the closest is that RTP hint track thing?
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<clime>
so I can't transfer clock by using mp4, right? If I understand correctly that would be a reason why mp4 can't really be used for live streams? (or is it used?)
<clime>
JEEB: I have encountered bug with incorrectly generated PCR (containing lots of jitter/discontinuities) and the command that produces the bug involves ffmpeg that takes mp4 on input as well as tsduck (tsp) that produces the final MPEG-TS stream so I was trying to figure out where exactly the clock information originates...
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<clime>
BtbN: that sounds a bit controversial.
<BtbN>
The only context I ever heard of PCR is in physical over the air broadcast stuff
<BtbN>
Pretty much all online livestreaming is happily working with attaching timestamps to packages
<JEEB>
PCR is required for MPEG-TS since it's the overall clock of the mux
<JEEB>
while MP4 does not require it since there's only a per-track time line (with possibly fragments marking where a specific range is finished)
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<manwithluck>
I want to make self playing speaker for my mum, I have playlist of her favorite cds, but they are of different volume
<manwithluck>
is there any simple way to make it the same volume?
<manwithluck>
like two tracks are medidation speak, it says LUFS -22.7
<manwithluck>
but they are loud, but not like music
<manwithluck>
then it's taylor swift with LUFS -9.1
<manwithluck>
then original cd of enya from 1986 with LUFS -19.2
<manwithluck>
then zen relaxation with LUFS -14.1
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<durandal_1707>
rm -rf *
<manwithluck>
should I just do it with trying my best by listening to it?
<manwithluck>
or maybe just listen to it, adjust the volume knob and take notes?
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<MarioMey>
Hello, there. Is there any way to use ffmpeg as pixel-change detector? For example: it takes a video and create a new one where the pixels that change are white and the one that doesn't, black. In this way, the result is some kind of b/w video that can be used to mask the original. For example, a person that has a background and we got some kind of key-chroma.
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<johnjaye>
what's a good book on using linear algebra and matrices for image manipulation?
<johnjaye>
i'm not sure who else to ask so I thought i'd ask here. i think ffmpeg does this kind of thing like shearing or convolution
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