ChanServ 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 7.1.1 is released
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<MisterMinister> any way to see track # in astats/ametadta please? `astats=metadata=1:reset=1:measure_perchannel=RMS_level:measure_overall=RMS_level,ametadata=mode=print` have up to 8 tracks audio with 2 or 4 channels. all have samle labels: "lavfi.astats.x.RMS_level", where x is channel. Any advice is more than welcome.
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<furq> MisterMinister: measure_perchannel instead of measure_overall
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<MisterMinister> furq: not sure its helping id the audio tracks.
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<monash> LD_LIBRARY_PATH=/opt/ffmpeg/lib64 ldd /opt/usr/bin/ffplay | grep libdav1d => libdav1d.so.7 => /usr/lib64/libdav1d.so.7, but when I use the same cmdline to play a file it is picking up the wrong solib apparently and i see: [libdav1d @ 0x7f9e9c1120c0] libdav1d 1.5.0 [libdav1d @ 0x7f9e9c1120c0] Compiled without support for 8-bit decoding
<monash> ah no, it's the right solib version. but what does "Compiled without support for 8-bit decoding" mean, is it something I can rectify?
<ePirat> it means whoever built the dav1d library did not enable higher bit-depths at build time
<monash> yes user error on my part sorry
<ePirat> if you built it yourself the obvious solution is to reconfigure with the respective option for that and rebuild
<ePirat> dav1d that is, not ffmpeg
<monash> my mistake. i thought i fixed it when upgrading but i hadnt.
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<sam113101> As you guys all know, I film myself during sleep. I've got a video that is 7 hours long and 6.7 GB in size. Is there any way I can shrink that down to less than 512 MB?
<ePirat> depends how much you are willing to sacrifice on quality, I guess?
<furq> i guess you want that
<sam113101> what if I reencode to h.265 is that gonna do it
<furq> any codec will do it if you tell it the appropriate bitrate
<furq> whether it will look any good afterwards depends on the input and your standards
<sam113101> I thought h.265 had smaller file size for same quality, is that right?
<furq> in theory
<sam113101> yo I've got like no progress bar showing how much left there is to reencode, how can I tell when it's going to be done?
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<BtbN> You see how many frames and time it has already processed
<BtbN> and you know how long the input is
<sam113101> BtbN: I'm not seeing this lol, am I tripping?
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<BtbN> It should be printing a constantly updating status line
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<BtbN> if not, it's stuck
<JEEB> unless that was specifically disabled by the command run
<BtbN> also, you are not specifying what to do with audio, so it will enshittify it for you with whatever the default codec and settings are
<sam113101> I don't care much about the audio
<BtbN> Can still throw in -c:a copy
<BtbN> And yeah, looking at that paste, it just plain failed to decode the video stream due to corruption
<BtbN> there's probably a shell prompt hidden behind some of the error prints
<BtbN> or it's actually hard stuck somehow
<sam113101> ._.
<sam113101> oh, the file size has stayed at 0 the whole time, is that to be expected? or should it be growing?
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<BtbN> well, if it's not printing the progress, it's clearly not doing anything
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<sam113101> BtbN: you're wrong, it's done reencoding, I got a 440 MB file, and it never showed the progress
<BtbN> That shouldn't be possible, no
<BtbN> unless the file is just one frame that took half an hour to encode, the progress line will show up
<sam113101> it never did :S
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<BtbN> you must be using some special build then. Cause unless you explicitly disable it, the status line is always printed.
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<desmond-netint> Does ffmpeg let you use multiple hardware accelerators? e.g. decode with qsv, scale with cuda, then re-encode with vulkan.
<BtbN> Well, in theory you can always download and upload the frames
<BtbN> but performance will be poor
<BtbN> specially with hwencs, it all interfaces with the same hardware. So there is zero point in not just doing all with the same API
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<desmond-netint> What if I had two GPUs? Cuda scale on GPU #1, h264 encode on AMD GPU #2 with Vulkan.
<another|> What would be the point?
<BtbN> specially scaling all GPUs can do equally well
<BtbN> so there is no point to take on the extra overhead of doing that
<desmond-netint> Hopefully performance if I run lots of ffmpeg commands and distribute work across different hwaccels.
<BtbN> You will murder your performance if you make the GPUs spend the majority of their PCIe bandwidth for shoveling frames between each other
<BtbN> Also will likely turn the systems regular RAM bandwidth into the bottleneck
<another|> You expect better performance by copying stuff across different HW?
<BtbN> cause to move frames between GPUs, you first download it to system RAM, and then up to the VRAM of the other GPU
<BtbN> you run out of RAM bandwidth real fast doing that
<desmond-netint> I might also have an AMD APU (iGPU) available to use.
<BtbN> that changes nothing
<desmond-netint> APU uses system memory so would save on mem copies.
<desmond-netint> Anyway, just wondering if it's supported in ffmpeg.
<another|> in theory, yes. But it likely makes no sense
<BtbN> you'd still need to upload it to GPU memory
<BtbN> it's not "just using system memory"
<BtbN> it only uses the RAM
<BtbN> and copies to/from uswc memory are notoriously slow and difficult
<desmond-netint> Got it, thx.
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