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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<aaabbb>
how can i tell if the short form of a filter option filter=foo:bar will remain equivalent to filter=param1=foo:param2=bar? and whether the defaults will remain the same?
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<aaabbb>
because i noticed that the mpdecimate filter had a new "keep" option added which broke "mpdeciate=0:1:1:1" being equivalent to "mpdecimate=max=0:hi=1:lo=1:frac=1", but other things like "scale=1280:720" is used frequently in the documentation so it seems like it's not necessary to explicitly use "scale=w=1280:h=720"
<aaabbb>
so that already broke my workload (my fault for not checking i guess) but then i wonder, is there a possibility that will happen to other filters like "volume=0.5" might one day not be the same as "volume=volume=0.5"?
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<blinux>
So, mpeg-4 doesn't have 10-bit encoding? Handbrake says it doesn't.
<blinux>
I saw bad banding on the Buck Bunny Demo video in the opening scene in the rabbit hole with mpeg-4 ffmpeg.
<blinux>
x264 didn't have this issue in handbrake.
<aaabbb>
nope, mpeg4 (at least the ffmpeg encoder) only supports yuv420p
<aaabbb>
x264 may not have that issue because it supports adaptive quantization. maybe handbrake turns on aq-mode=3 by default
<aaabbb>
aq-mode=3 lowers the qp around dark areas, allocating more bits to dark areas that are prone to banding in sdr material
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<aaabbb>
i'm guessing you mean mpeg4 part 2 btw not part 10 (which does have 10bit)
<aaabbb>
blinux: you could try the deband filter maybe?
<aaabbb>
and if the banding is coming from the source being 10bit then you could add dither
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<blinux>
aaabbb: I see "deblock filter" in Handbrake, is that it?
<aaabbb>
blinux: it probably uses the libavfilter deblock filter, so probably
<aaabbb>
it's codec agnostic so it'll also work with theora
<aaabbb>
fwiw i tested theora to see the banding you were talking about (on another video). i was able to get rid of it by injecting some grain
<blinux>
aaabbb: I tried that on the filter. It didn't seem to do anything. It looks like mpeg-4 is not very good solution for serious video. It can't even handle the Big Buck Bunny video well in the opening scene. It does most things well, but a few things stop it from being an mpeg-2 or AVC quality encoder.
<aaabbb>
blinux: then inject some grain
<aaabbb>
that's a classic solution especially with older codeccs
<blinux>
And I'm using it on the highest quality setting. OK, I'll check for grain setting.
<aaabbb>
it's not a setting, it's something you have to inject
<aaabbb>
the "noise" filter can also inject grain (and it'll be faster than geq)
<aaabbb>
"noise=alls=5" for example. play with the amount of noise, you want the minimum amount that removes banding. too little and you still have banding. too much and the film starts to look visibly grainy
<aaabbb>
dvds and blurays often inject grain especially for anime where banding is a serious problem. they can get away with it because optical media can get away with a super high bitrate (you need a high bitrate to keep grain)
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<blinux>
I tried the Theora codec and it had more problems thatn mpeg-4. The tree in the opening scene was jumping as the camera zoomed.
<aaabbb>
ah
<aaabbb>
i'm pretty surprised that that would happen even at super high bitrates
<blinux>
I was curious if a super-dvd could have been released with VP3 or MPEG-4 around 2002. Yes, bitrates don't seem to help, only using a newer codec.
<blinux>
I was thinking that a super-dvd with 1024x575 resolution and VP3/Theora or mpeg-4 would have been nice.
<aaabbb>
i'm sure a group releasing super-dvd would be able to tune the codec to support it
<blinux>
1024x576 EDTV
<blinux>
I could try other footage that is not animated/cgi
<blinux>
I think it has problems with dark areas though. Weird patterns and blocking.
<aaabbb>
well that's where grain injection comes in
<aaabbb>
it can protect from both banding and blocking
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<blinux>
Deblock very strong small 4x4 does nothing.
<aaabbb>
hmm blocking is not usual for high bitrate encodes. you're getting both banding *and* blocking?
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<blinux>
Well I see blocks with weird patters in them. I think i see bands too without blocks, but the blocks are more noticeable.
<aaabbb>
what are you getting for ssim?
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<aaabbb>
not cuz ssim is better than manual inspection but because i'm curious if something is going wrong
<blinux>
I haven't used that before. I'm using handbrake right now. I did some testing with mpeg-4 using just ffmpeg, though my ffmpeg seperate install doesn't have x264 working so I went back to handbrake.
<aaabbb>
on linux the static btbn builds are very good for latest ffmpeg. for windows the gyan builds are good
<blinux>
libopenh264 doesn't look very good.
<aaabbb>
yeah that doesn't surprise me. for h264, x264 is totally unrivaled
<blinux>
Ok, I'll try the btbn. I'm on linux.
<aaabbb>
the "gpl" build is the one that has the most features. the lgbl and the -shared builds have certain features removed to make it compatible with other licenses
<blinux>
great I can try with this one. I'll have to try tomorrow. Thanks.
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<noobaroo>
Does anyone know what package I need to install to build with vulkan on (K)Ubuntu?
<noobaroo>
vkcube works
<noobaroo>
I have vulkan-utility-libraries-dev vulkan-tools vkroots-headers libgulkan-0.15-0t64 libgulkan-dev libspirv-cross-c-shared0 libspirv-cross-c-shared-dev libvulkan-dev libvulkan-volk-dev libvulkan1 mesa-vulkan-drivers
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<JEEB>
noobaroo: any recent enough version requires pretty recent vulkan headers, you can see the exact checks failing in ffbuild/config.log
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<VoxellPaladyne>
hey
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<iconoclast_hero>
anyone know what is required for building ffmpeg w/vulkan support on ubuntu?
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<VoxellPaladyne>
i have a question with libplacebo
<VoxellPaladyne>
my friend suggested me to use the libplacebo filters to downscale my videos
<VoxellPaladyne>
i visited the docs and decided i'd use the mitchell downscaler
<VoxellPaladyne>
but i for the love of god can not find the syntax for how i can set the filter up so that it downscales from 1920x1080 to 1280x720 using the mitchell downscaler
<VoxellPaladyne>
i dont see how i could set the downscaler to mitchell
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<VoxellPaladyne>
if someone could write a really simple demonstration i'd be glad
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<another|>
there is lots of documentation and examples
<VoxellPaladyne>
alright i've tinkered around a bit but i'm still having an issue: `ffmpeg -i input.mkv -vf libplacebo=w=1920:h=1080:force_original_aspect_ratio=decrease:normalize_sar=true:upscaler=ewa_lanczos:downscaler=ewa_lanczos output.mp4` copied DIRECTLY from the examples result in instant completion of the command, no progress text shown, 0 byte output file
<VoxellPaladyne>
even `ffmpeg -i input.mkv -vf "libplacebo" output.mp4` results in the same thing
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<bray90820>
So I have a bunch of flac files thatare above 16 bit 1411 kbps how would I convert them to that
<bray90820>
Would I first have o know what the files currently are
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<YungBlood>
Hi, I have 2 challenges with ffmpeg, and so far I've been unable to figure them out. First, I have an IP camera that outputs jpeg images to a specified address, and I would like to transcode that into an hls livestream. The problem is I haven't found the option to make ffmpeg re-grab the image. the closest I've been able to do is have it create a loop of the first image.
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<BtbN>
while true; do cat image.jpeg; done | ffmpeg -i - ....
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<BtbN>
make sure to specify a framerate and maybe use -re, otherwise this will go _fast_
<VoxellPaladyne>
any help on my issue?
<YungBlood>
hrm. I'll give that a try. Thanks!! :)
<VoxellPaladyne>
`-vf "libplacebo"` and derivatives always output 0 byte output video
<YungBlood>
My other challenge is connecting to a NVR running this command to transcode from rtsp to hls: /usr/bin/ffmpeg -rtsp_transport tcp -i $address -c:v copy -an -hls_time 1 -hls_list_size 2 -hls_segment_filename $filebase-%03d.ts -hls_flags delete_segments -start_number 1 $filebase.m3u8
<BtbN>
I doubt there is any such example in the docs, cause libplacebo only operates on hardware frames, and that command isn't giving it those.
<YungBlood>
It works flawlessly for 15 cameras, but for number 16, I seem to get a corrupted output, and can't view the stream with hls.js
<YungBlood>
yet I can view the output stream from ffmpeg with vlc...
<VoxellPaladyne>
for instance using the second example `libplacebo=w=1920:h=1080:force_original_aspect_ratio=decrease:normalize_sar=true:upscaler=ewa_lanczos:downscaler=ewa_lanczos` gives the same output: report: https://voxell.s-ul.eu/Oke13vuO
<BtbN>
Again, libplacebo only operates on hardware frames
<BtbN>
of course it instantly fails with software frames
<another|>
bray90820: bitrate makes no sense for flac
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<VoxellPaladyne>
huh, what does that mean? can i mitigate this in any way?
<BtbN>
Use a hardware de and encoder, or manually hwupload+download around libplacebo. But the later likely negates all performance gains
<VoxellPaladyne>
oh, like hevc_nvenc and not libx264?
<BtbN>
The whole deal of libplacebo is do use the GPU
<VoxellPaladyne>
what are my alternatives for using the CPU to get a mitchell downscaling/upscaling?
<BtbN>
I have no idea what that is, so can't tell you
<VoxellPaladyne>
alright, thanks
<BtbN>
But if there is some algorithm that's only in libplacebo, you can always just hwupload before and download after
<bray90820>
I wanted to convert that and others to CD quality
<bray90820>
Preferablly in m4a format
<BtbN>
"CD quality"?
<BtbN>
CDs are lossless uncompressed PCM
<BtbN>
flacs are also lossless, so... CD quality I guess?
<bray90820>
BtbN: Ihere is deff files above CD quality
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<BtbN>
CDs are lossless
<BtbN>
zero compression
<VoxellPaladyne>
uuh is hwupload and download supposed to be convoluted?
<BtbN>
What do you mean?
<bray90820>
CD's are not compressed but are digitral so they do have a finite Quality
<VoxellPaladyne>
how does one convert the software frames into hardware frames on windows? all i see are `-vaapi_device /dev/dri/renderD128` and whatnow
<VoxellPaladyne>
whatnot*
<bray90820>
another|: another|: Did you see my example?
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<another|>
bray90820: what example? all I've seen is a screenshot of vlc
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<bray90820>
Yeah that's the quality the audio is cureently I wanted to convert it to CD quality
<bray90820>
another|:
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<YungBlood>
BtbN: I tried this command from your suggestion, yet I'm not getting any output files... while true; do wget 'http://192.168.0.105/cgi-bin/snapshot.cgi?channel=16'; -O - ; done | /usr/bin/ffmpeg -i - -c:v copy -an -hls_time 1 -hls_list_size 2 -hls_segment_filename /var/www/html/clock/cams/channel16-%03d.ts -hls_flags delete_segments -start_number 1 -r 0.5 /var/www/html/clock/cams/channel.m3u8
<YungBlood>
Am I missing something?
<BtbN>
I don't think you can put mjpeg into hls, can you?
<another|>
BtbN: seems hwupload is sometimes(?) inserted automatically
<YungBlood>
yes you can... but this is just a stream of jpegs...
<YungBlood>
so not quite mjpeg?
<BtbN>
that's pretty much exactly what mjpeg is
<YungBlood>
first time I ran the command, it said:
<YungBlood>
Format mjpeg detected only with low score of 25, misdetection possible!
<YungBlood>
[mjpeg @ 0x610ecf855000] Could not find codec parameters for stream 0 (Video: mj peg, none(bt470bg/unknown/unknown)): unspecified size
<YungBlood>
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (500 0000) options
<BtbN>
Yeah, you'll have to tell it what the input is
<BtbN>
-f image2pipe or something
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<another|>
bray90820: that screenshot is meaningless
<another|>
ffprobe
<YungBlood>
BtbN: Ok, this is closer... although I'm still concerned that I'm not getting ffmpeg output messages until I hit ^C...
<YungBlood>
[hls @ 0x556cb17f57c0] Opening '/var/www/html/clock/cams/house17-001.ts' for writing
<YungBlood>
[hls @ 0x556cb17f57c0] Opening '/var/www/html/clock/cams/house17.m3u8.tmp' for writing
<YungBlood>
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown