[Ffmpeg-devel-irc] ffmpeg.log.20180801

[burek]

[00:03:26 CEST] <07IADHHJN> <+SP9002_ at efnet> so, he wants the win. so we're just gonna get lunch or something, then hes gonna push me to the ground and tap my ass with his foot so he can claim he "kicked my ass" tbh im going along with it becase I dont wanna lose any teeth
[01:00:01 CEST] <analogical> spammers :S
[01:03:50 CEST] <DHE> for the record, I would acquit
[01:10:20 CEST] <TheAMM> I'm surprised they even bother
[02:15:45 CEST] <cottongin18> With our IRC ad service you can reach a global audience of entrepreneurs and fentanyl addicts with extraordinary engagement rates! https://williampitcock.com/
[03:27:56 CEST] <burnout_28> With our IRC ad service you can reach a global audience of entrepreneurs and fentanyl addicts with extraordinary engagement rates! https://williampitcock.com/
[03:29:00 CEST] Last message repeated 1 time(s).
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[10:07:18 CEST] <wingrime2> anyone can explain -analyzeduration
[10:07:55 CEST] <DHE> there's a function that tries to gather a bunch of information about the stream like length, bitrate, number of streams, codecs, video resolution, etc
[10:08:20 CEST] <DHE> but sometimes it's not reliable, so it times out after a while and provides incomplete information. that parameter selects the timeout
[10:15:24 CEST] <lostlabyrinth27> With our IRC ad service you can reach a global audience of entrepreneurs and fentanyl addicts with extraordinary engagement rates! https://williampitcock.com/
[10:17:34 CEST] <botik101> hello, I have a question about ffmpeg and NVIDIA GPU. Specifically, can someone explain to me why it is necessary to compile ffmpeg to support it? Wouldn't NVIDI offer default libraries so that there should be already default GPU enabled ffmpeg outthere?
[10:18:08 CEST] <MissionCritical> Read what IRC investigative journalists have uncovered on the freenode pedophilia scandal https://encyclopediadramatica.rs/Freenodegate
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[10:38:09 CEST] <psyb0t> hi! hey, does anybody know how ffmpeg can be used to output an hls stream to a file and on stream connection issues/general failures to keep on writing to the file using a black frame until reconnection is successful? thanks!
[10:49:36 CEST] <BtbN> psyb0t, what do you mean? ffmpeg has no ides if someone is "connected" to the HLS "stream".
[10:49:42 CEST] <BtbN> *idea
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[10:56:02 CEST] <psyb0t> BtbN, I mean i do ffmpeg -i http://foo/bar/chunklist.m3u8 output.mp4 and whenever the computer loses internet connection or the streaming server goes down for any period of time, blank frames should fill the video until the connection is up again. like retry until conn up; while retry do write black frame of the same size of the input
[10:56:33 CEST] <BtbN> Don't think that's possible
[10:56:54 CEST] <BtbN> Pull up a player that does that, and screen-capture it
[10:57:08 CEST] <psyb0t> good point xD
[10:57:12 CEST] <BtbN> also, don't ever record to mp4, it's asking for data-loss
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[11:17:07 CEST] <BtbN> ubitux, can you set +r here please?
[11:18:00 CEST] <ubitux> what does it do?
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[11:36:13 CEST] <BtbN> ubitux, blocks unregistered users. See the wall of bot-spam for the reason.
[11:36:48 CEST] <ubitux> i only see too so far, nothing happened in the last 15min
[11:36:51 CEST] <ubitux> should be fine
[11:36:57 CEST] <ubitux> s/too/two
[11:37:29 CEST] <BtbN> There were hundreds of them before you joined, both here and in -devel
[11:37:51 CEST] <Guest75462> With our IRC ad service you can reach a global audience of entrepreneurs and fentanyl addicts with extraordinary engagement rates! https://williampitcock.com/
[11:38:40 CEST] <ubitux> BtbN: hf
[11:38:54 CEST] <BtbN> +r seems to block them reliably in other channels
[11:40:13 CEST] <furq> you'd be better off setting +q $~a
[11:40:19 CEST] <furq> which lets unregistered users join but stops them from speaking
[11:44:30 CEST] <BtbN> seems like a good idea, yeah
[11:57:41 CEST] <botik101> arghhh my messges disappear
[11:58:00 CEST] <botik101> i have cuda and nvidia and opencv nd eveyrthing uses it. Can someone explain why we need to compile ffmpeg to enable it to use GPU? why can&t it be already pre-built?
[12:01:20 CEST] <BtbN> You'll have to ask the person who built your ffmpeg binary. FFmpeg themselves does not distribute binaries.
[12:01:36 CEST] <BtbN> Also, specifically cuda and nvidia stuff makes the binaries non-free, so they can't legally be redistributed.
[12:02:21 CEST] <BtbN> For nvidia the pure de/encoder is GPL compatible, but everything that uses CUDA, like a bunch of filters, is non-free.
[13:00:44 CEST] <barhom> Anyone know of any issues with live-transcoding mpeg2 (ts) to h264 (ts) and that the process dies at exactly 86400 seconds? All my transcode jobs are dying at the second
[13:10:56 CEST] <hrvoje> barhom: try and attach to the process with strace -f -p PID a minute or so before the 86400 seconds is up and see why it dies .. never happened to me, had transcode jobs running for weeks
[14:31:49 CEST] <atbd> Anyone knows how to avoid hang/freeze when mpegts rollover happens in a program using ffmpeg api. Especially av_read_frame() ?
[14:32:32 CEST] <atbd> it happens every 26.5 hours so i need to reboot it
[16:31:57 CEST] <DHE> atbd: That's kinda odd, because there appears to be code to handle that and mpegts provides its timestamp range properly
[16:40:08 CEST] <barhom> So I just ran my transcode for 24 hours with a -report
[16:40:25 CEST] <barhom> the report is 250mb big and as with atbd, but not at 26.5hrs it is dying
[16:41:31 CEST] <atbd> DHE: i'm looking into it. I just succeed to reproduce the problem on a one hour ts file.
[16:41:44 CEST] <barhom> Last 100 lines: https://0bin.net/paste/Ox7krd2WVtXbFLZN#T7ib3Zpw5ZW-zl+xCvOAJWsNX2g7RIZRhV4crbUweb+
[16:41:57 CEST] <barhom> This is what is interesting:
[16:41:58 CEST] <barhom> [out_0_0 @ 0x55d20328d6c0] EOF on sink link out_0_0:default.
[16:41:59 CEST] <barhom> [out_0_1 @ 0x55d203318b00] EOF on sink link out_0_1:default.
[16:42:00 CEST] <barhom> No more output streams to write to, finishing.
[16:42:45 CEST] <barhom> I am "tee":ing my output to UDP and HLS, not sure if the TEE command has some 86400seconds limit maybe
[16:43:11 CEST] <atbd> barhom: i saw same things
[16:43:27 CEST] <barhom> But yours are dying at 26hrs, mine is dying at 86400seconds
[16:43:28 CEST] <atbd> I think more of a network limit
[16:43:36 CEST] <atbd> for your case
[16:43:43 CEST] <atbd> mine is linked to mpegts
[16:58:06 CEST] <barhom> atbd: I really doubt its a network limit. What HTTP input has a limit of 86400seconds?
[17:14:06 CEST] <atbd> barhom: it is your udp output which disconnect if i understand the log
[17:34:03 CEST] <atbd> DHE: i think i solved my issue. ffmpeg handles the rollover but my program did not like the timestamp difference :|
[19:25:22 CEST] <barhom> atbd: how did you notice it is my UDP?
[20:08:30 CEST] <kerio> the itunes alac encoder makes files that are just slightly smaller than the ffmpeg alac encoder :|
[20:08:32 CEST] <kerio> this is upsetting
[20:10:36 CEST] <Mavrik> Is it?
[20:10:43 CEST] <Mavrik> Is ALAC even a relevant codec these days?
[20:10:59 CEST] <kerio> why not
[20:11:26 CEST] <kerio> it's the only lossless codec understood by itunes, for one thing
[22:35:54 CEST] <deltasquared> I'm currently trying to get kms capture to work on my system after finding x11grab to be too laggy. command I am attempting is https://ptpb.pw/O408 and log is https://ptpb.pw/1BUi - this command is failing when I start this command from a console where I have sudo and then VT-switching to another user's X11 session.
[22:36:10 CEST] <deltasquared> if I stay on the (kernel) console where I run ffmpeg, it works fine.
[22:36:40 CEST] <deltasquared> it seems that ffmpeg (specifically something to do with vaapi) isn't liking what I am trying to do here, any alternative suggestions?
[22:37:29 CEST] <deltasquared> running the command with sudo inside the other user's x11 session is very much not desireable - I'd like eventually to shove this in a systemd service so I can record whatever is going on in my system should I choose.
[22:40:17 CEST] <jkqxz> libva has some weird problems when trying to work with DRM master fds.  With your command there, try hwmap without the 'derive_device' option?  (That will use the device passed to the filter chain, which is the one specified by -vaapi_device with the render node.  In your current commandline that device is created but not used anywhere.)
[22:40:37 CEST] <deltasquared> hwmap without derive device, ok one second
[22:41:14 CEST] <deltasquared> wait a sec... was that working? *checks output file*
[22:41:41 CEST] <deltasquared> ok well it went blank at the part where I switched back to console, but that actually appeared to work
[22:41:42 CEST] <deltasquared> welp
[22:41:47 CEST] <deltasquared> I'm going to have to experiment now
[22:42:06 CEST] <deltasquared> jkqxz: does this mean I won't be able to use vaapi though for hardware encode
[22:43:22 CEST] <jkqxz> No, you can still use VAAPI there.  Just don't create it by derivation from a DRM master device as root, because libva barfs on that.  The change I suggested will make the VAAPI device separately from a render node; as long as it's actually on the same underlying real device (graphics card, whatever) it will work.
[22:43:55 CEST] <deltasquared> okie then, I'll try making it -c:v h264_vaapi then, one moment
[22:45:07 CEST] <jkqxz> Does switching to X having started kmsgrab on a VT work for you?  IIRC that case makes X abort because it just gives up when it can't get DRM master back on switching to it, though I admit I've never looked at how that works very carefully.
[22:45:32 CEST] <deltasquared> jkqxz: on my system it causes a complete display lockup
[22:45:49 CEST] <deltasquared> the system responds to suspend via acpi button, but I otherwise completely lose control
[22:45:57 CEST] <deltasquared> but yes I have tried that
[22:46:55 CEST] <deltasquared> this system doesn't like having things GPU-wise poked funny in my experience. mpv using --vo=drm can cause similar lockups
[22:47:04 CEST] <jkqxz> Ouch, ok.
[22:47:29 CEST] <deltasquared> needless to say, you could understand why I'd avoid that ;)
[22:47:45 CEST] <deltasquared> the CPU usage is nicely minimal at least
[22:47:51 CEST] <deltasquared> running a test record now
[22:48:05 CEST] <deltasquared> only about 3% max
[22:49:38 CEST] <jkqxz> Yeah.  kmsgrab does something pretty evil and consequently has annoying conditions to work (and ugly failure modes), but when it works well it's really good.
[22:50:07 CEST] <deltasquared> evil things like needing to acquire DRM master? :>
[22:50:38 CEST] <jkqxz> Exactly.
[22:51:21 CEST] <deltasquared> ugh once again the quick sync encoder does some funky things to colours...
[22:52:28 CEST] <deltasquared> among other artefacts... hrm. I guess it'd suffice for livestreaming though.
[22:53:55 CEST] <deltasquared> heh, my mouse doesn't show up in the recording... I wonder if that's a hardware overlay thing going on there
[22:56:08 CEST] <deltasquared> jkqxz: thanks for the time anyway. I'm definitely writing this one down ASAP
[22:57:03 CEST] <jkqxz> Yes, you won't get the mouse at all because it's on a different plane.  If you pick the mouse overlay plane to capture you can get the cursor on its own instead, but compositing them is beyond what it can do (since that's actually happening in the display-output hardware for the screen).
[22:58:30 CEST] <deltasquared> jkqxz: that figures. thankfully it's not vital in my case, as I had intended in one case to record a game which grabs the mouse anyways.
[22:58:42 CEST] <deltasquared> again x11grab proving to be too laggy for that
[23:08:23 CEST] <RationalCoding> Hello, I'm experiencing some video artefacts during multi-variant HLS encoding with scenecut disabled (so the segments are aligned). The artefacts exclusively appear at the bottom of the video and only during a scenecut. They disappear when a keyframe is hit. They look like this: https://imgur.com/a/MEzB8Wq. Any idea where I could start looking to solve this (search terms, settings, etc)?
[23:20:17 CEST] <kepstin> RationalCoding: my guess is is that the encoder's just running out of bitrate. What are you using for bitrate & vbv settings? what's your keyframe interval?
[23:21:49 CEST] <RationalCoding> I'm using crf 18, without a fixed bitrate. I'm not familiar with the vbv option.
[23:21:57 CEST] <RationalCoding> Keyframe interval is 90.
[23:22:53 CEST] <kepstin> so assuming 30fps, that's 3s between keyframes
[23:22:58 CEST] <RationalCoding> Right.
[23:23:13 CEST] <kepstin> crf 18 with 3s keyframes will be a pretty high bitrate stream, that should have absolutely no artifacts like that
[23:23:43 CEST] <kepstin> i'm guessing that the problem is most likely in the input to the encoder
[23:24:51 CEST] <kepstin> that looks similar to what I'd expect with an mpeg-ts over udp stream that lost a packet, for example.
[23:25:40 CEST] <RationalCoding> It's an RTP over TCP stream from Kurento. Kurento has been a bit problematic in the past, so you might be correct. The artefacts aren't present in the input stream though.
[23:26:28 CEST] <kepstin> you sure it's TCP? TCP wouldn't have packet loss like that.
[23:27:02 CEST] <kepstin> there must either be some UDP in there somewhere or alternately some code that's dropping data e.g. due to buffer overflows
[23:27:40 CEST] <kepstin> (the ffmpeg cli tool doesn't do that with most input types, but I'm not familiar with its rtp over tcp code)
[23:28:11 CEST] <RationalCoding> Ah, it is UDP. I reverted my switch to TCP after having issues with it.
[23:28:33 CEST] <RationalCoding> Will dropped packets be logged with loglevel debug?
[23:28:35 CEST] <kepstin> with udp, you might want to increase receive buffer sizes
[23:28:50 CEST] <kepstin> ffmpeg should log something about having to conceal errors during decoding
[23:28:52 CEST] <kepstin> i think
[23:29:49 CEST] <kepstin> so yeah, increase your udp receive buffer size, and make sure to tune the encoder so it's running faster than realtime (and using <100% cpu)
[23:30:04 CEST] <RationalCoding> That is the -buffer_size option, correct?
[23:32:33 CEST] <RationalCoding> Alright, I think it's pretty probably that this a dropped packet issue or a problem with the input stream. I have a couple ideas. Thanks for your help.
[23:34:38 CEST] <kepstin> ffmpeg will drop udp input if the receive buffer overflows while it's encoding a frame (if the encoder is running too slowly/using too much cpu)
[23:34:45 CEST] <kepstin> so that's something to keep an eye out for
[23:35:32 CEST] <RationalCoding> I don't think I'll have any CPU issues on this machine, but the buffer overflow thing is something I'll look out for.
[00:00:00 CEST] --- Thu Aug  2 2018