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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<BullHorn>
any resolve users here? trying to figure how to equate resolve's AV1 Constant QP (QP I, QP P and QP B, 1-255 sliders) to ffmpeg's CQP 1-50
<BullHorn>
why are these things different between the apps idgi
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<noobaroo>
BullHorn what is resolve?
<noobaroo>
I have a question that is difficult to describe, but I hope someone has an answer for me
<noobaroo>
I feel like to a tech-savvy person this might have a very easy, obvious answer.
<noobaroo>
All of the anime I can get my hands on looks very washed out, I'm trying my best to describe here. It looks more dull at the same time as it looks artificially brightened or something.
<noobaroo>
It just doesn't look nearly as sharp and vivid and clear as western cartoons. I don't watch a lot of cartoons so really I have only have 2 western cartoons fresh in my mind, "Rick and Morty" and "Spongebob" But I have no doubt they are all more clear and vivid and sharp looking than anime
<noobaroo>
I saw 1 reddit post about anime upscaling software that was saying regardless of what resolution the product is, all anime is produced at 576p or something (might not be 576p exactly, but something low, less than 720p for sure)
<noobaroo>
s/all anime/almost all anime/
<noobaroo>
This really isn't a satisfying answer why anime looks so poor quality to me though. It's not just an issue of pixelation, but also of color. The colors just look faded. Faded, washed out, etc
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<frankplow>
noobaroo: Viewing HDR content on a non-HDR display can make colours washed out
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<BullHorn>
resolve is davinci resolve, the most popular video editing and post processing software on the market
<BullHorn>
i think it only started supporting constant QP recently but its different than cqp and i cant find documentation, was hoping someone here knows whats up
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<JEEB>
it's a closed source application that integrates *some* encoder and maps against *some* options in it. enjoy reverse engineering that, since otherwise you do not know what it does inside.
<Netham45>
I'm mixing some inputs, they're raw PCM fed by pipes. Is there a way to read from the pipes when they're sending data but not block mixing other inputs if one pipe isn't sending anything?
<furq>
does resolve even support software av1 encoding
<Netham45>
That works as long as both streams are sending but if one stream stops sending it blocks the other. I can remove the pipe for one stream to get it to not block anymore but then I don't have any way of getting it to reopen that pipe except for restarting ffmpeg.
<Netham45>
It's not acting a buffer underrun, it's acting like it's blocking on reading from an empty pipe.
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<luc4>
Hello! When concatenating more video files with ffmpeg, what is the difference between the concat filter and using the concat demuxer with re-encoding? I'm referring to this doc: https://trac.ffmpeg.org/wiki/Concatenate. Is using the demuxer concat with re-encoding (-vcodec h264 for instance) different from using filter_complex?
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<blueswan>
hello everyone, i need to extract the audio from a movie source which ive done by using "ffmpeg -i movie.avi -map 0:a -acodec audio -c copy output.mp3". i was wondering if this command will transcode/alter the audio in any way, as the original audio is mp3 and i would rather not have that re-transcoded to mp3 again
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<noobaroo>
You're good and you don't need -acodec audio
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<kepstin>
luc4: with the concat demuxer, all of the input videos have to have compatible codecs, because they're all run through the same decoder one after the other. with concat filter, each input video is decoded completely independently.
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<luc4>
kepstin: I see, thanks!
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<BtbN>
-acodec/-vcodec are also long deprecated, use -codec/-c
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<blueswan>
is there an easy way for me to stretch an audio file? i have a movie soundtrack which is 02:34:21:793 but would like to stretch it to 02:40:58:691 so it is on par with the movie
<blueswan>
i want to retain as much audio quality as possible, and would like to keep it as a seperate file (so not baked into the movie file)
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<blueswan>
currently i can achieve this exact thing in kdenlive. however some audio quality is lost due to rendering mp3 to mp3. i'm wondering if ffmpeg could come in handy in this case
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<alien_lappy>
So, i'm working on the RPI4 hw codecs and testing with h264_v4l2m2m ffmpeg driver, but if i want to play videos randomly, not all of them are gonna be h264 , but if i don't specify it, it won't take the v4l2m2m hw codecs; how can i fix that?
<JEEB>
how hardware decoding wrappers are usually done is by having a hwaccel. that would be then attempted to be poked in decoders. the normal decoder infra is being utilized for parsing and stuff, and then slice decoding would get pointed towards the functions poking at the hardware decoder
<JEEB>
that way you generally don't have to specify anything format-specific
<JEEB>
in ffmpeg cli it'd be something like `-hwaccel d3d11va -hwaccel_output_format d3d11` or so, as an example of existing hwaccel usage (or vaapi for linux with vaapi f.ex.)
<alien_lappy>
so, the v4l2m2m stuff don't have hwaccel set up?
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<JEEB>
if you look at libavcodec/v4l2_m2m_dec.c you'll see it just specifies N different decoders
<alien_lappy>
ok, so some development needs to be done to do this, but... are all v4l2m2m hw ? i don't believe so?
<JEEB>
it's a driver framework right? whatever is behind that interface then provides the functionality
<alien_lappy>
well, yeah, i'm working on upstreaming the RPI4 hw decoder (which uses the v4l m2m)
<JEEB>
kind of like videotoolbox where you then separately have an option to allow/disallow non-hardware implementations. but that only works if the interface that you are utilizing even provides that sorts of flags/options
<alien_lappy>
but i meant that how does ffmpeg v4l2m2m driver know if the underlying kernel driver has hw behind it (ie should be preferred or not?)
<JEEB>
that would be the job of the driver interface to provide either a flag or option at the end of the day
<JEEB>
since it goes through v4l2, if v4l2 does not tell then you don't know
<alien_lappy>
right
<JEEB>
but to be honest I don't think I've seen any software drivers so far, although for development I bet they exist
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<JEEB>
if you are doing swdec why would you do it in kernel space :P
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<alien_lappy>
fair, but iinm there is a software implementation, that may or may not be active on most kernels? i donno
<JEEB>
anyways, it being a separate "decoder" probably also means that a whole bunch of metadata that would othewise be parsed by the non-slice decoding bits of the included decoder
<JEEB>
I mean, if there was a swdec and it was available in most kernels I would have it, too. and I don't have any m2m drivers :P
<alien_lappy>
ok, so doing a hwaccel on the v4l2m2m would be safe
<alien_lappy>
is anyone working on that, you know?
<JEEB>
not that I know. consultants mostly work on their own forks anyways (as seen by none of the stateless decoders being upstreamed other than one patch being posted in either 2019 or 2020, which was before various codec interfaces were stabilized)
<alien_lappy>
yeah, I only really got involved as I had the "I can't believe it not there yet, I'll have to look into this myself" thing
<furq>
can you believe it yet
<alien_lappy>
yes
<alien_lappy>
converting the stuff that hw providers have and make it suitable for the linux kernel is not that easy
<alien_lappy>
well, the RPI4 one is stateful, but iinm, i hear the RPI5 one was gonna be stateless... we'll see
<JEEB>
I think the rpi4 h.264 one was stateful, but underlying implementation poked MMAL?
<JEEB>
for HEVC/H.265 they made something from scratch with the stateless interface
<JEEB>
(since they didn't have existing MMAL interfaces, I think?)
<alien_lappy>
i donno about RPI5, but the RPI4 one is indeed stateful and pokes mmal
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<another|>
afaik rpi5 doesn't have avc. only hevc
<JEEB>
yea, so mmal is native for H.264
<JEEB>
HEVC is then stateless v4l2
<alien_lappy>
JEEB: so, where would I ask around for this hwaccel thing?
<alien_lappy>
should i go to the -devel channel (if i have access) or trac or mailing list or ask around here?
<alien_lappy>
also it would be great if it wouldn't fail if there are no B frames support, instead of needing to specify B-frames but then empty list
<JEEB>
alien_lappy: for internal development, the -devel channel should be accessible just fine
<JEEB>
this channel is for external API usage and cli usage
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<alien_lappy>
thx
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