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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<le_patenteux> oh for the love of god! how do I get the chromakey filter to work with the VAAPI encoder output? I tried many approach without success
<le_patenteux> ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -i P1000097.MP4 -ss 00:00:0.0 -t 10 -vf "format=nv12|vaapi,chromakey=0x369239:0.08:0.00" -c:v h264_vaapi -c:a copy P1000097_alpha.mp4
<le_patenteux> i always get:
<le_patenteux> Impossible to convert between the formats supported by the filter 'Parsed_format_0' and the filter 'auto_scale_0'
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<another|> I don't think you run soft filters on hw frames
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<aaabbb> i'm using the audio filter, silenceremove with stop_duration=5. i am using this as vad (voice activity detection) and using amix to mix in silence when silenceremove stops outputting due to detecting silence. however even with stop_duration=5 it seems to be that it will stop outputting immediately when silence is detected
<aaabbb> specifically i am using: silenceremove=stop_periods=-1:stop_duration=10:stop_threshold=-50dB
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<aaabbb> it's even happening when i use apad (which didn't seem to be emitting silence)
<evilscreww> aaabbb, sup.
<aaabbb> hi
<le_patenteux> hi
<aaabbb> "silenceremove=stop_periods=-1:stop_duration=2:stop_threshold=-30dB,apad" doesn't work for vad either, it just stops outputting the stream immediately when sound drops below -30dB
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<aaabbb> instead of outputting sound unchanged for 2 seconds and then pure silence
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<le_patenteux> i read conflicting informations online about Vp8 encoding... some say it was in ffmpeg as far back as 2017 and other say it does not exist...
<le_patenteux> (I mean hardware encoding)
<le_patenteux> I tried on AMD, with VAAPI, nothing there... I am investigating Intel as it is supposet to be included in VAAPI, but it does not seem to be built in ffmpeg...
<le_patenteux> This post suggests building from source to add vp9_vaapi https://stackoverflow.com/questions/26000606/how-do-you-get-ffmpeg-to-encode-with-vaapi
<le_patenteux> but if the feature exists, why is it not simply built into ffmpeg?
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<JEEB> le_patenteux: never believe until you see it in someone's actual vainfo output :P
<JEEB> also FFmpeg contains stuff that people cared enough to add, it's not like code magically appears
<le_patenteux> I have been on this till midnight yesterday... I have an Intel Laptop that should be able through QuickSync according to tha blog post and some further reading... It just bogles my mind that it is not simply built with ffmpeg if it truly works
<le_patenteux> And I think you are wrong... I did not write any code, and yet, code exists.. If it is not magic, I can't tell what it is!
<jkqxz> What sort of Intel? Older ones have VP8 encode and decode, but encode got removed in the more recent generations.
<le_patenteux> What? Why??? That is bonkers!
<jkqxz> Everything in the last few years has VP9 both encode and decode.
<jkqxz> Because noone cares about VP8 any more, and it costs chip area?
<le_patenteux> It is a i5-10210U
<le_patenteux> VP8 I get it... but VP9 ?
<jkqxz> That has hardware for VP8 and VP9, both encode and decode.
<le_patenteux> (I know my previous message was about Vp8, but I meant Vp8/Vp9... the webm codecs)
<le_patenteux> so... do you know how to make it work?
<le_patenteux> What spells do I need to invoke in the terminal to make this work?
<le_patenteux> because vainfo just lists decoding, not encoding
<jkqxz> Hmm. You have the iHD driver, presumably?
<le_patenteux> I am on Linux, with Mesa
<le_patenteux> (Pop!_OS)
<jkqxz> When they switched to that Intel did not bring forward the VP8 and VP9 encoding for the older platforms.
<le_patenteux> also, what is your source for VP8 VP9 capabilities on hardware? I searched a lot yesterday and found conflicting information there too
<jkqxz> It is there, but making it work is probably a big pain. You would want to get the old driver (<https://github.com/intel/intel-vaapi-driver>) which does have the encode support, but I'm not sure it will know about the newer gen9 platforms.
<le_patenteux> okay, but is it the same for Linux and Windows? Just so I dont fall in too deep of a rabit hole!
<BtbN> They abandoned the feature as far as I'm aware
<BtbN> Best to just consider vpX hwencoding to be nonexistent
<jkqxz> VP9 encode works on newer things.
<BtbN> I don't think it was particularily good either, so might as well just use avc
<le_patenteux> That is crazy... I really don't understand why they would abandon code that enables a feature that would push them in front of Apple Hardware!
<BtbN> Because it's work to maintain it
<BtbN> Specially if better alternatives exist
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<le_patenteux> because the hardware is capable, it is just a matter of driver support!
<le_patenteux> can you tell me more about better alternatives please?
<BtbN> AV1 exists now
<BtbN> And drivers don't write themselves
<le_patenteux> My needs are video (any format!) with alpha channel capabilities and hardware acceleration.... that's it!
<le_patenteux> Does AV1 have alpha channel?
<BtbN> yesn't
<BtbN> I think it's done the exact same hacky way there, i.e. separate stream
<BtbN> but software support is spotty at best
<BtbN> Like, I tested hevc_nvenc alpha channel encoding again. It works, but absolutely nothing I tested can reproduce it. Including ffmpeg itself.
<le_patenteux> Man... I can't believe that... VPx is the only format that accepts alpha, but it is the least supported video format on the planet!
<jkqxz> AV1 has no alpha support at all.
<le_patenteux> (I know technically apple's implementation oh HEVC does support it, but I don't own I stuff)
<JEEB> well, looking at AVIF alpha, it's the same as VPx alpha, just defined in HEIF context :P https://aomediacodec.github.io/av1-avif/v1.1.0.html#auxiliary-images
<jkqxz> There are proposals to standardise the apple-style alpha in AV1, though, so it might be around at some point in the not-too-distant future.
<JEEB> so it's a separate coded image because nobody apparently wants to define a single image with four planes
<BtbN> I'm unsure wether I should push the nvenc alpha channel patch
<JEEB> I think testing it with the reference decoder might work
<BtbN> the output is practically useless and I'm not even super confident it's correct, cause I can't test it
<JEEB> and/or with Apple
<le_patenteux> ok, if nvenc can encode with alpha on hevc, would a video editing software be able to pick it up?
<JEEB> most likelye not
<JEEB> but yea, support for the VPS extensions in the multi-layer extensions annex F is lulz
<JEEB> I only know of Apple poking at that. they might have caused some vendors to implement it
<le_patenteux> I have been running in circles for 2 days :(
<BtbN> like I said, _nothing_ i tested supports the reproduction of the alpha channel in hevc
<BtbN> it's just like it's not there
<BtbN> In the real world, it's best to just consider video with an alpha channel as nonexistent, and work with that.
<JEEB> le_patenteux: just encode with fast settings in software, why are you so fixated on hw encoding?
<BtbN> I guess cause libvpx sucks
<le_patenteux> VP8 fast so far was 2-3 fps
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<le_patenteux> I don't call that fast!
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<JEEB> umm, I was doing 2160p at faster than that with my 5900X with libvpx-vp9 and `-cpu-used 1 -deadline good`
<le_patenteux> I know vp9 scales poorly on multiple CPUs, so my 40cores server is useless for that task! :D
<JEEB> wat
<jkqxz> Older Intel with VP8 and VP9 (only 8-bit) hardware encode: <https://0x0.st/X8FQ.txt>.
<JEEB> I mean yes, threading is most likely crappier in libvpx than in something like SVT-AV1
<JEEB> but still, I was mostly pointing out that that speed was hilariously slow
<JEEB> with VP8, to boot
<jkqxz> Yours is the same generation of graphics as that, so I expect it would work with a suitably-hacked old driver.
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<JEEB> also do note that you cannot expect the hw encoder to support alpha
<jkqxz> Though it won't do anything special with alpha. That would require a lot more work.
<JEEB> yea, you need to do the same as the libvpx wrapper - initialize another encoder separately
<le_patenteux> the hardware encoder supports alpha without issue... except encoding time is super slow for me... I will try your options
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<jkqxz> Dealing with the plane splitting wouldn't really work in VAAPI, but with a bit of help (from Vulkan?) it could be implemented.
<le_patenteux> i meant software encoder*
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<BtbN> If you insist on using video with an alpha channel, libvpx is your only viable option really
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<le_patenteux> so hw encoding does not play nice with alpha?
<BtbN> Cause nobody implemented support for the hack that is alpha in vpX
<le_patenteux> I will try to optimize the libvpx options then
<le_patenteux> with -cpu-used 1 -deadline good I still get 2-3 fps
<le_patenteux> this is my command
<le_patenteux> ffmpeg -i P1000097.MP4 -vf chromakey=0x369239:0.06:0.06 -pix_fmt yuva420p -cpu-used 1 -deadline good P1000097_alpha.webm
<JEEB> the options are different between the libvpx VP8 and VP9 things :P
<JEEB> also I recommend not skipping defining the encoder
<JEEB> -c:v THING
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<le_patenteux> oh... yes, I tried that too
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<JEEB> also skipping rate control is something else I don't recommend :P
<JEEB> with libvpx VP9 at least I used CRF since I don't care about exact bit rate but just overall quality level
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<jkqxz> The Intel driver "upgrade": <http://0x0.st/X8FL.txt> -> <http://0x0.st/X8F9.txt>.
<jkqxz> It lost the H.264 MVC support as well as VP9, but people probably don't care much about that one...
<le_patenteux> I can't make a working command with -vcodec libvpx
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<le_patenteux> nevermind, it was a typo
<le_patenteux> this command:
<le_patenteux> ffmpeg -i P1000097.MP4 -vf chromakey=0x369239:0.06:0.06 -pix_fmt yuva420p -vcodec libvpx-vp9 -crf 24 -cpu-used 1 -deadline good P1000097_alpha.webm
<le_patenteux> works, but at 1.1fps
<JEEB> yea, then those two options you can look at the docs from libvpx's side and adjust to get it faster most likely
<le_patenteux> the fastest I got was with that comand, but still, 2 to 4 fps
<le_patenteux> I can't paste it...
<le_patenteux> ffmpeg -f lavfi -i color=c=0x00ff0000:s=3840x2160,format=yuva420p -i P1000097.MP4 -filter_complex "[1:0]chromakey=0x369239:0.06:0.06[ckout];[0:v][ckout]overlay[out]" -map "[out]" -map 1:a -pix_fmt yuva420p -threads 16 -cpu-used 8 -tile-columns 6 -row-mt 1 -frame-parallel 0 P1000097_alpha.webm
<le_patenteux> there
<le_patenteux> my other trail was to use h264 or hevc with hardware encoding and replacing the background with a solid color for easier keeing in software, but I could not get the chromakey filter to work wit an hardware encoded output
<le_patenteux> if someone knows how to use a cpu filter than pass it to the gpu for final encoding, I am all ears!
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<jokoon> hello: is ffmpeg+cuda mature enough? isn't it widespread?
<jokoon> I mean I would imagine this would make encoding much faster?
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<BtbN> CUDA is not utilized for encoding and is not in any way helpful for it
<BtbN> nvenc is, but it's nost just a magic "make encoding fast" switch either, it's a dedicated hardware encoder
<jokoon> do you mean it doesn't really plug itself very well with how ffmpeg work?
<BtbN> I don't understand the question
<BtbN> CUDA is just not useful for video encoding of the common codecs
<BtbN> GPUs in general aren't
<BtbN> I think you are confusing CUDA with hardware encoders? All modern GPUs bring one, but they don't use the GPU for encoding. It's a dedicated hwenc
<BtbN> With all its drawbacks and advantages.
<jokoon> I admit I don't know enough about video algorithm... I thought video compression encoding would be something that can be parallelized easily
<BtbN> no, video encoding is something that parallelizes very poorly
<jokoon> oh really
<BtbN> and parallelizing it hurts the quality
<jokoon> so the only real way to make encoding faster, is SSE things, or CPU things dedicated to video encoding?
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<BtbN> Well, hardware encoders exist
<BtbN> they go bloody fast, but are worse in all other aspects
<jokoon> are those HW encoder featured in general desktop/laptop CPUs? does that mean hardware encoders might get better in the future?
<BtbN> Like I said, every half modern GPU brings one
<jokoon> I would imagine those HW encoder are present in smartphone, and explain the bad compression
<BtbN> And no, hwencs by principle won't beat software encoding for quality
<BtbN> they are far less shit than in the past for sure, but a good software encoder will always be able to beat the best hwenc at pure quality per bitrate
<another|> <BtbN> they go bloody fast, but are worse in all other aspects
<jokoon> I wish I could learn how those algo work to understand why it's not parallelizable... I understand a bit about image compression, vector things, keyframe and so on. I lack a high level computer science education haha
<another|> not all aspects. power consumption is also quite good
<BtbN> That depends on the hardware in question
<BtbN> Having something like a 4080 or 4090 up its clock... vs sw encoding on a Laptop CPU... I'm not sure what wins
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<BtbN> If you want to build an encoding server, and the focus is power efficiency and you don't care about quality, putting hwencs in there is better for sure though
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<another|> But does it have to up it's clock?
<BtbN> The nvenc asic shares its clock with the GPU, yeah
<another|> hm.. bummer
<BtbN> So it'll very much have to go out of any low power state it may have, and if you want max performance, will have to go all the way up
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<jokoon> how important is SSE for video encoding? maybe my previous question came as ignorant, and I don't really know what would the latest SSE things improve.
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<jokoon> I also saw AMD had SSE5, I thought it stopped at SSE4
<galad> the newest x86_64 simd extensions are called avx
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<furq> the sse5 stuff got renamed years ago and then mostly dropped also years ago
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<furq> simd stuff in general is pretty important for video
<furq> but more or less any amd64 cpu ever made will have most of the big performance gains
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<iconoclast_hero> i have `ffmpeg -i "$1" 2> ".tmp$stamp"` in a script and it's worked fine to get me a list of chapters...
<iconoclast_hero> this particular file is giving me some errors:
<iconoclast_hero> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x63cf2ede7580] stream 0, timescale not set
<iconoclast_hero> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x63cf2ede7580] Attached picture on stream 1 has invalid size, ignoring
<iconoclast_hero> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x63cf2ede7580] Could not find codec parameters for stream 1 (Video: png (png / 0x20676E70), none, 225x225): unspecified pixel format
<iconoclast_hero> it's m4b with about 1/2 a dozen chapters and this error might be preventing ffmpeg from dispalying the chapters.
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<tomb^> hi, i'm trying to figure out how to overlay 2 images on top of video, I tried "-i video.mp4 -i image1.png -i image2.png -filter_complex"[1][0]scale2ref=oh*mdar:ih*0.13[logo][video];[2][0]scale2ref=oh*mdar:i*0.13[watermark][video];video][logo]overlay=(main_w-overlay_w):0;[video][watermark]overlay=(main_w-overlay_w):0", doesn't work.. what am i doing wrong?
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