BtbN 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 7.0 is released
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<contrapunctus>
Hi, I'm trying to make a video slideshow from a series of images. ffmpeg v6.1.1-1 from Debian Testing - https://paste.rs/L81Hm
<contrapunctus>
First, I tried this - `ffmpeg -f image2 -pattern_type glob -framerate 1/2 -i '*.png' -c:v libvpx-vp9 -crf 20 -an output-0.5fps.webm` ...which worked, but the last image just briefly flashes on the screen before the video ends.
<contrapunctus>
I tried fixing that by holding the last frame - `ffmpeg -f image2 -pattern_type glob -framerate 1/2 -i '*.png' -f lavfi -i anullsrc -af apad -t 9 -c:v libvpx-vp9 -crf 20 output-0.5fps.webm` ...but it's the _first_ frame that ends up being held instead 🤔️
<contrapunctus>
I've also tried this, but with the same results as the last invocation. `ffmpeg -f image2 -pattern_type glob -framerate 1/2 -i '*.png' -f lavfi -i anullsrc -af "apad=pad_dur=1" -shortest -c:v libvpx-vp9 -crf 20 output-0.5fps.webm`
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<contrapunctus>
I also tried the suggestion on the wiki for framerate issues, but that results in the video ignoring the first two input images and just alternating between the third and fourth images four times (there are four images that match the glob)...wtf? 😶️ https://trac.ffmpeg.org/wiki/Slideshow#Ifyourvideodoesnotshowtheframescorrectly
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<mandigal>
Hi there, for some reason forwarding/rewinding inside audio tracks seems to fail after converting FLAC (with variable bitrate) to OGG files and timestamps get lost. Tracks play fine other than that, but song is missing. Anyone know of a fix? Output log: https://pastebin.com/dUypTaRD
<mandigal>
song info*
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<mandigal>
but the issue is, the track will start again from the beginning
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<contrapunctus>
Re: the slideshow video problems, I made a symlink to the last image and used my original invocation. It's ugly, but I haven't found a better alternative.
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<makidoll>
hello! i'm wondering if av1 support will be added to rtp any time soon. i tried looking for it on trac.ffmpeg.org but couldnt find anything
<JEEB>
but basically, if there's no patch posted, it means that nobody (yet) cared enough, so if you care about it I would recommend looking at whether you can implement it
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<makidoll>
aah thank you for the patchwork page. i tried looking into implementing it myself earlier today but havent made much progress. i was looking at the rtp code for vp9 and also reading the specs and got a bit confused. ill have to take another look some other time and perhaps look at the av1 rpc payload code for gstreamer
<BtbN>
Doesn't rtp just shovel around mpeg-ts?
<BtbN>
And av1 in ts is not supported yet
<JEEB>
no, there is a mode with MPEG-TS over RTP, but RTP itself is separate
<CounterPillow>
makidoll: I've started working on hacking it in on Saturday but I'm way out of my depth and haven't found the energy to continue so far, but now have a clearer understanding of what needs to be done
<makidoll>
oh! that's awesome! im more than happy to try to help
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<makidoll>
obs uses temporal unit for packetization
<CounterPillow>
yes the standard says you can't have two OBUs of different temporal ids in the same packet
<makidoll>
ah yeah, alright
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<Ingvix>
is there some way I could try to automatically normalise the brightness changes caused by the automatic light sensitivity changes of the camera?
<Ingvix>
so the background would look more or less the same even if foreground changes
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<kasper93>
Is anyone here on Windows with AMD GPU? I get very slow hardware decoding after updating to 24.4.1.
<kasper93>
anyone seen similar issue?
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<jkqxz>
What hardware, and what does "very slow" mean?
* JEEB
only has AMD laptops under linux
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<kasper93>
jkqxz: 5700xt and very slow means it doesn't keep up decoding. I get 15fps on 4k hevc now
<kasper93>
before it was multiple times faster
<kasper93>
don't recal exact number, but 8k decoding had 43 fps, because this I explicity benchmarked some time ago
<JEEB>
so something like `ffmpeg -v verbose -hwaccel d3d11va -hwaccel_output_format d3d11 -i blah.mp4 -f null pipe:` gets that slow?
<jkqxz>
In what context? That sounds like something is completely wrong with the decode path, like pointlessly copying things to CPU memory and back or something.
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<kasper93>
JEEB: yes
<JEEB>
ouch
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<jkqxz>
Hmm. Does task manager show that it is saturating the engine, or is it that there are large gaps between frames?
<kasper93>
video codec 0 is constantly at 100%
<jkqxz>
That makes it sound like some sort of clocking issue. There is only the decode in the command JEEB said, so there isn't much opportunity for anything else to slow it down.
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<noobaroo>
I have a 2160p video that is not very clear, I think it is a 1080p that was poorly upscaled or something, it has a 20mbps bitrate and I want to convert it back to 1080p preferably HEVC
<noobaroo>
I've tried a few different things and the colors are off each and everytime
<noobaroo>
The internet says I need to manually set the color primaries, but doesn't really elaborate on how
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