#ffmpeg on 2025-05-06 — 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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11:42 <futurion> I'm looking for as perfect as possible CBR mpegts UDP stream with h264_nvenc encoder... the stream should be complete "straight-line" CBR without any minimal spikes or fluctuations, should be DVB compatible, etc. I've tried many combinations and different approaches, but I can't come close to "real" CBR. Can someone point me into right direction or

11:42 <futurion> at least tell me if this is even doable with ffmpeg?

11:44 <futurion> ffmpeg -re -i test.mp4 -r 25 -g 50 -c:v h264_nvenc -preset fast -rc cbr -b:v 8200k -minrate 8200k -maxrate 8200k -bufsize 880k -muxrate 8800k -c:a mp2 -ac 2 -b:a 192k -ar 48000 -pcr_period 30 -f mpegts "udp://239.3.3.3:10000?pkt_size=1316&bitrate=8800000"

11:46 <futurion> That's the closest I get, but that command has two issues...first is bufsize which is small enough to keep CBR accepateble, but the video quality is worse for that reason... if I use bigger bufsize, no more CBR... then the second issue is output &bitrate parameter which (at least on windows) doesn't work ok and returns "cannot allocate memory"

11:46 <futurion> errors...

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11:48 <BtbN> With a bigger bufsize, it's still CBR, but over the period of that buffer size

11:49 <BtbN> There is no such thing as "perfect CBR". It's only ever perfect over a desired timeframe.

11:50 <BtbN> If you make the bufsize 2x the bitrate, the resulting output will have a constant bitrate over any 2 second window

11:50 <BtbN> but within a 2 second window, it can and will fluctuate wildly

11:50 <kepstin> achieving "perfect" cbr for dvb is usually done by adding padding to frames to bring smaller ones up to the required size

11:51 <BtbN> The usual way to deal with that, specially in the context of broadcasting which DOES have a perfectly strict constant bitrate, is to have the muxer pad the data, and make sure your packet size and bufsize align well enough for it to always fit

11:51 <futurion> I've used some other playout software (i.e. Cinegy Air) which uses it's own nvenc-based encoder and it produces 100% exact CBR without any spikes on momentary basis....I did some tests with mpeganalyzes... can ffmpeg also produce something like this somehow using muxrate and filling with blank packets, etc?

11:51 <BtbN> It's probably also just padding

11:51 <BtbN> the ts muxer has an option for that

11:51 <futurion> yes, that's exactly what I'm looking for...can ffmpeg do this padding as well on its own?

11:52 <BtbN> Make sure you use the lastest version first, there was a fix with cbr padding in nvenc recently

11:52 <BtbN> And then yes, read the documentation of the mpegts muxer

11:52 <BtbN> iirc it's the only muxer that can do it, and you want to use it for dvb broadcast anyway

11:53 <futurion> so you maybe know with which nvenc API version this was implemented? or maybe point me to the right documentation for this new mpegts muxer?

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14:14 <BtbN> Not sure what you mean by "Which NVENC API"

14:14 <BtbN> The patch was merged a couple weeks ago

14:14 <BtbN> got nothing to do with any nvenc api versions

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15:45 <johnjaye> so if i want to add padding silence should i use apad or anullsrc?

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15:45 <johnjaye> as opposed to just, generating silent audio and then concating it with other audio?

15:45 <johnjaye> in this case i have file.aac and need to add 10 seconds of silence in front

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