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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<tykling> hello :) can I use ffmpeg to lower the framerate of a video without reencoding or changing the length of the video?
<tykling> basically just drop every... 2 out of 3 frames but keep the video as-is otherwise?
<tykling> input is 25fps and I need 6fps so almost 3/4 in fact
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<JEEB> tykling: the fps filter basically should do that, a relatively simple drop to get the requested constant frame rate on the output side
<tykling> JEEB: ok I see, I am not very experienced with this, https://trac.ffmpeg.org/wiki/ChangingFrameRate seems to suggest that that means re-encoding? I want to make sure not to affect quality or length of the video
<tykling> I am getting ready to try ffmpeg -itsscale 4.166666 -i input.mp4 -codec copy output.mp4 (with 25/6=4.1666...)
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<tykling> no that just stretched the video, making it 6fps but much longer
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<frankplow> tykling: Yeah as that page says, you can’t drop frames without re-encoding
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<noobaroo> transpose_vaapi says function not implemented for every option, but vpp_qsv=transpose works
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<noobaroo> What is the proper command to use filter -vf transpose_vaapi?
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<noobaroo> Also what's the proper way to pipe ffmpeg decode-only into ffplay?
<noobaroo> I'm using: ffmpeg -hwaccel qsv -c:v hevc_qsv -ss 28:00 -i $V -map 0:0 -vf hwdownload,format=p010 -pix_fmt p010le -c:a copy -f rawvideo - | ffplay -i -
<noobaroo> But it has a crazy amount of cpu usage
<kepstin> noobaroo: yeah, downloading frames to ram and then copying them through a pipe is pretty high cpu usage. why in the world would you want to do that?
<kepstin> if you want to play hardware decoded frames, then decode them and play them without downloading to ram - they can stay entirely on the video card with a properly set up player.
<kepstin> (which means you can't use ffplay; consider mpv instead)
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<kepstin> i wouldn't be surprised if ffplay ended up doing software/cpu pixel format conversion from p010le to an rgb format with the pipe command :/
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<kasper93> is this suppose to work? ffmpeg -seg_format_options f=mpegts -i ...
<kasper93> It still do autodetection instead
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<AlexandrKirilov> Hello all!
<AlexandrKirilov> There are command that contain "-f hls -strftime 1 -hls_time 6 -hls_list_size 20 -hls_delete_threshold 500 -hls_flags delete_segments -hls_segment_filename '%v_stream_%Y%m%d-%s.ts' -master_pl_name 'stream.m3u8' -y %v_stream.m3u8" The problem is that "-hls_delete_threshold 500" ignored. There are only 41 segments. Why so?
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<noobaroo> kepstin okay, do you know how to use the transpose_vaapi filter?
<kepstin> noobaroo: well, the first thing is that you need vaapi frames, not qsv frames. Use -hwaccel vaapi (and don't set a decoder)
<noobaroo> kepstin thanks for the help
<noobaroo> Of course im not using transpose_vaapi with qsv lol. I tried: ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -ss 28:00 -i $V -vf transpose_vaapi=hflip -c:v hevc_vaapi -c:a copy output-vaapi-test.mkv
<noobaroo> But i also just now tried removing the decoder and it still doesn't work
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<Netham45> I'm taking in a PCM stream and outputting it as both PCM and mp3. When I was just outputting it just as PCM I was able to pause and resume the input data by pausing the stream and letting it block reading from a pipe but after I added the mp3 output it no longer handles any delay beyond a few seconds in the stream. It's also cumulative, any little gaps due to network add up and after 30 minutes or so the stream stops. Is there a way to get it to have
<Netham45> more tolerance on the input?
<Netham45> I'm already running through aersample with async set to a really high number
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<Netham45> My asetpts for the input PCM is asetpts='(RTCTIME-RTCSTART)/(TB*1000000)'
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<Netham45> Hmm, N/SR/TB is working a lot better. I swear I tried it before and it didn't work.
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