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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<drew>
I want to encode a video with a target filesize, so I am doing 2 pass encoding, but I don't want to re-encode the audio. I did `ffmpeg -i infile.mp4 -map 0:a:0 -c copy -f null -` to get the size of the audio stream of my source, then I calculated what filesize and then bitrate I needed for the video, but even with -c:a copy, the filesize of the audio changed when I checked the output file with that
<drew>
null mux command again
<drew>
shouldn't the null mux give the same size for both streams if I am using -c:a copy?
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<JEEB>
null mux would just get the size of the packets without any container overhead since it has nothing of its own.
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<znf>
you know, it always bugged me that ffmpeg --help writes it's help to stderr instead of stdout and I can't | grep for stuff
<EmberCrest>
I've got problems realtime streaming over RTSP with the VP9 + Libopus codecs. The input is H.264, 960x720, 24fps, aac @ 48kHz, but the audio is rather choppy. Using FFMPEG 7.
<EmberCrest>
video is fine but audio is "botty" if you know what I mean.. looking for tips on what to check. compression_level and cpu-used have been tinkered with little impact. I know these files are OK because RTMP works just fine
<vlt>
znf: Maybe that’s the only way the developers found to keep stdout clean for passing through any data. I alwys use `ffmpeg --help 2>&1 | grep ...` or `... | less` if I need to search.
<znf>
yeah, that's what I do too, it's just something extra I have to remember all the time
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<ephilalethes>
I'm running a command using `-pattern_type glob -i '*4k.jpg'`, but I get: `[image2 @ 0x5714d68b7640] Could not open file : *4k.jpg`
<ephilalethes>
so I assume something is going wrong with that
<ephilalethes>
anyone know what?
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<BtbN>
znf: any modern shell supports |& instead of just |
<znf>
oh, I didn't know that
<BtbN>
not sure if Ubuntus minimal thing they use does, but bash and zsh definitely do
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<ephilalethes>
nvm the above, I'm just stupid again
<ephilalethes>
running it in the wrong folder ;D
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<naught>
Is there any example code using libavdeivce? Could I use it as a portable way to get input from the webcam?
<nemo_magneet>
hoping that it restarts when it canceld
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<DHE>
Curid: H264 doesn't suffer image quality degradation from long periods without keyframes, so several different keyframe schemes are available... cutting only on a scene change is viable, if awful for seeking.