#ffmpeg on 2025-06-17 — irc logs at libera.catirclogs.org

2025-03-03 01:06 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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07:16 <YUiNA> i like the new "elapsed=" time on the stat line

07:16 <YUiNA> any plans to add a "remaining=" time?

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07:48 <microchip_> YUiNA: unlikely, too convoluted and the line will get too long for many terminals

07:50 <furq> well also because it's not always possible to know

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19:17 <telgareith> I'm trying to use ffmpeg to capture composite video from a OTG102 capture card, but my i5-5200U is maxing out it's cpu doing an mpeg2 encode (insanity), and ffmpeg doesn't seem to be writing to a file on a mounted cifs share. here's the command: "ffmpeg -f v4l2 -i /dev/video2 -f alsa -i hw:2 -target ntsc-dvd 1.mpg"

19:17 <telgareith> suggestions?

19:20 <telgareith> I'm not opposed to useing intel QSV for mpeg2 (I'll trans code with something better later),

19:21 <furq> x264 will probably be faster on a modern cpu

19:21 <furq> the m2v encoder is singlethreaded and probably not as well optimised in general

19:23 <furq> i would guess the cifs thing is an issue with your cifs mount

19:23 <furq> it shouldn't make any difference to ffmpeg

19:26 <telgareith> its a 5th gen intel

19:26 <furq> that's modern enough

19:26 <telgareith> not for quality h264 QSV

19:27 <another|> x264 is a software encoder

19:27 <telgareith> and no issue with cifs, just thought it might be relevant. when I was using the wrong video input it wrote files out fine

19:28 <telgareith> to be blunt- I'll eat my hat if h264 is faster than mpeg2 when mpeg2 appears to be saturating an entire core on a 2 core laptop cpu

19:30 <telgareith> https://gist.github.com/telgareith/1b380eceefa21527f608e9013902e1f4 here's a gist 'screenshot of the cli.

19:32 <furq> does the status display indicate anything is being written

19:32 <furq> i can't tell if it's not printing one or if you overwrote it all with ^A

19:36 <telgareith> it does nothing after listing the codecs/compiling options

19:36 <telgareith> so, it stops at line 11 until I jam ctrl+C

19:37 <furq> if there's no stats line then it's probably not encoding anything

19:37 <furq> are you sure the input works

19:37 <furq> i wouldn't expect it to busyloop if it doesn't work but who knows

19:37 <telgareith> it worked in windows, and the audio works, but I don't know if video does in linux

19:38 <furq> maybe try playing it in mpv or something

19:38 <telgareith> no gui, just cli :|

19:38 <furq> ffmpeg -f v4l2 -i /dev/video2 -f null -

19:39 <furq> maybe with -v verbose as well

19:40 <telgareith> "Finishing stream 0:0 without any data written to it."

19:41 <furq> well that doesn't sound good

19:42 <telgareith> indeed

19:43 <furq> not really sure how you would go about debugging a v4l device

19:43 <furq> i guess you can look into it with v4l2-ctl

19:44 <telgareith> I've been trying to post an output of list devices + -all but discord gist is broken

19:44 <furq> that is also an ancient ffmpeg so it's probably worth upgrading that

19:45 <furq> https://github.com/BtbN/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-linux64-gpl.tar.xz

19:45 <telgareith> the capture card is from 2009

19:46 <furq> sure but it's possible something got fixed

19:46 <telgareith> maybe. but I have to bail for now. thanks.

19:46 <telgareith> github gist not working is the final straw for now.

19:47 <furq> github seems to be having issues in general

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