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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<znf> I'm transcoding some video with libx265 (from H264 video), 1080p, on an Intel 10700k, and I'm only getting.. 42 fps? shouldn't this be faster?
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<StephenLynx> if is not using hardware and is real time, I dunno.
<StephenLynx> i wouldn't expect much.
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<znf> nah, it's static content, I'd have expected at least 60 on CPU
<znf> I have a few hours of video to transcode and I'm not sure if I should bite the bullet and use the CPU (and wait forever, and have my fan running non-stop), or just... use my GPU and call it a day
<znf> ...or I could distribute across a few servers, but then I have to work out some network file system
<znf> ...decisions decisions
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<StephenLynx> ah yeah, indeed. when just transcoding it will give you a metric in fps too, forgot that.
<StephenLynx> yeah, transcoding is slow on CPU.
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<snoriman> wait what? ... is `btop` showing wrong values or is the h264 decoder in ffmpeg amazingly fast? I'm only seeinng 1.7-4% CPU usage for 4K video (?)
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<microchip_> snoriman: hardware acceleration (gpu)?
<snoriman> microchip_: If I recall correctly, I should have to specifically create a hw decoder when creating the AVCodecContext and friends, right?
<furq> ffmpeg -i foo.264 -f null -
<furq> will show you how many times faster than realtime it can decode
<snoriman> thanks, is that the "speed=" value that I need to check?
<furq> ayeah
<furq> 4% on a modern cpu sounds normal enough
<snoriman> it says 44x :)
<snoriman> oh.. wait the video is not 4K
<snoriman> it's 1080x1920, that explains something; but still pretty amazing
<snoriman> lol from the 100 videos I received, there is one -not- 4K and that's the one I use as a test
<furq> well h264 is 21 years old already
<snoriman> pfew wow
<furq> and i'd expect that's had more attention than any other decoder
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<vanfanel64> Could someone please tell me what I might be doing wrong here?
<vanfanel64> ffmpeg -i IMG_2518.MP4 -vf drawtext=fontfile='/usr/share/fonts/truetype/freefont/FreeSerif.ttf':fontsize=20:fontcolor=white:text='Fri, 2024-10-18 03:00:00 PM':y=1050:x=1850 tmp/IMG_2518.MP4
<vanfanel64> I get:
<vanfanel64> [AVFilterGraph @ 0x55f9d0928900] No such filter: '2024-10-18 03:00:00 PM:y'
<vanfanel64> I am just trying to add a little bit of text on the bottom of a video from a nature camera whose time got reset to 2018.
<BtbN> , separates filters, so after "Fri," it expects the next filter
<vanfanel64> (I am on Linux, Debian 12, if that matters.)
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<vanfanel64> BtbN, but that is text which is in quotes?
<vanfanel64> I am very confused
<BtbN> Your shell interprets those, so ffmpeg never sees any quotes.
<vanfanel64> Oh
<vanfanel64> I tried text='"Fri, 2024-10-18 03:00:00 PM"' but get the same error
<vanfanel64> What is the correct way to escape a comma and colon?
<BtbN> I think ffmpeg only cares about ''
<BtbN> so those quotes are the wrong way around
<vanfanel64> BtbN, I tried I tried text="'Fri, 2024-10-18 03:00:00 PM'" and I tried text=\''Fri, 2024-10-18 03:00:00 PM'\' and no joy
<vanfanel64> BtbN, thank you. text='Fri\\\, 2024-10-18 03\\\:00\\\:00 PM' did the trick
<BtbN> I'd honestly just put the text into a file :D
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<vanfanel64> How do you load from a file?
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<noobaroo> what alternative software can remux to new containers other than ffmpeg? i noticed mkvtoolnix and mp4box both produce smaller file sizes than ffmpeg
<kepstin> vanfanel64: "-filter_complex_script <filename>"; or if you're using a sufficiently new ffmpeg, "-/filter_complex <filename>" works too.
<kepstin> hmm, you're not using complex filters tho, so it would be "-filter_script:v <filename>" or "-/filter:v <filename>" for that.
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