#ffmpeg on 2025-06-13 — 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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14:38 <MarioMey> Hello, there. I wanted to reverse a video using -vf reverse. Video was 1080, 8m long. The first time, the whole computer freezed until ffmpeg was terminated: "killed". By I-don't-know-who. The second try, I convert first to MJPEG to make it easier. Then, reversed it. Well... I had to reboot the OS (Debian 12).

14:38 <MarioMey> I think ffmpeg put the complete video in memory to do this process, doesn't it?

14:39 <MarioMey> I have 16GB, but maybe it is not enought for this file.

14:44 <furq> it has to buffer the entire decoded video in memory, which would be about 37GB for 8 minutes of 25fps yuv420p

14:44 <furq> so yeah it probably got killed by the oom killer

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15:48 <sam113101> guys help, I accidentally pressed a key other than q and now it wouldn't quit

15:48 <sam113101> tried ctrl+c and ctrl+d but thaht didn't work either

15:49 <sam113101> so I killed it

15:49 <sam113101> now my video file is fucked

15:50 <sam113101> https://paste.centos.org/view/raw/5da36117

15:53 <sam113101> was recording from my security camera

15:57 <sam113101> hello?

15:57 <blb> sam113101: i've read untrunc might help, but i'm not sure. https://github.com/anthwlock/untrunc

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16:01 <sam113101> shit, I'll have to compile it? no appimage or anything like that?

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16:07 <MarioMey> furq: ok, thanks.

16:15 <sam113101> - installed package ffmpeg-libs-7.1.1-6.fc42.x86_64 conflicts with libavutil-free provided by libavutil-free-7.1.1-3.fc42.x86_64 from fedora

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16:37 <sam113101> blb: thank you, it seems to have worked

16:38 <sam113101> wait

16:38 <sam113101> no I'm missing a huge chunk of the video

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17:10 <another|> sam113101: Now you know why not to record to mp4

17:18 <sam113101> another|: Wait no. I'm not that smart. Do explain.

17:18 <furq> because of what just happened to you

17:20 <furq> https://developer.apple.com/documentation/quicktime-file-format/movie_atom

17:21 <furq> this is variable size so it can't be written until the streams are encoded etc

17:21 <furq> and if it's not there the file is unplayable

17:21 <furq> hence the need for a tool that tries to fabricate a moov atom based on a similar file

17:22 <furq> if you want something that is absolutely robust against crashes then use mpegts

17:23 <furq> but mkv is usually good enough and less annoying to deal with

17:28 <sam113101> furq: ffmpeg -i rtsp://admin:password@192.168.50.181 Videos/sleep/temp5.mkv

17:28 <sam113101> is that enough?

17:30 <furq> you probably want -c copy

17:30 <furq> otherwise it'll reencode

17:35 <sam113101> thanks man

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20:56 <ttys000_> hello

20:56 <ttys000_> i was trying to use this example from the docs: https://trac.ffmpeg.org/wiki/AudioChannelManipulation#stereo2monofiles

20:56 <ttys000_> e.g. ffmpeg -i stereo.wav -map_channel 0.0.0 left.wav -map_channel 0.0.1 right.wav

20:57 <ttys000_> but i'm getting an error Unrecognized option 'map_channel'

20:57 <ttys000_> is this option no longer supported?

20:57 <ttys000_> ffmpeg version 7.1.1

20:58 <ttys000_> oh, it's depreciated: https://patchwork.ffmpeg.org/project/ffmpeg/patch/20220723140952.31814-14-anton@khirnov.net/

20:58 <ttys000_> i see

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