[Ffmpeg-devel-irc] ffmpeg.log.20171223

[burek]

[00:00:10 CET] <pos> it does, primary pulls rtsp video (and audio if embedded in the same stream)
[00:00:45 CET] <pos> it supports extra ffmpeg options, like allowed_media_types and loglevel
[00:00:59 CET] <pos> specifying two sources does not work, however
[01:14:56 CET] <pos> are there any options in ffmpeg to ignore the embedded segment time from the source?
[01:15:37 CET] <pos> i store maybe fifteen minutes of video, yet all players seem to think the file is 240 hours long (source uptime)?
[01:15:42 CET] <pos> rtsp
[01:18:36 CET] <sfan5> genpts?
[01:19:45 CET] <pos> please explain?
[01:20:11 CET] <sfan5> https://ffmpeg.org/ffmpeg-formats.html#Format-Options
[01:20:16 CET] <sfan5> not exactly sure but you can try -fflags +genpts
[01:31:30 CET] <pos> nope, didn't work
[01:31:54 CET] <pos> and the output now appears to be even longer :)
[01:37:07 CET] <greencalx> Anyone using Opus audio? I have tried ffmpeg 3.1.4 and 3.4.1 and get "Invalid data" when I pass a .opus file as input
[01:40:33 CET] <pos> sfan5, yeah, playing the stream with mpv gives: No video PTS! Making something up.
[01:40:33 CET] <pos> VO: [opengl] 1920x1080 yuv420p
[01:40:34 CET] <pos> Invalid video timestamp: 0.000000 -> 0.000000
[01:57:14 CET] <pos> https://stackoverflow.com/questions/5522112/ffmpeg-rtsp-problem-with-ip-camera
[03:41:03 CET] <Johnjay> asdf
[04:28:08 CET] <chanmyae> Hi
[04:29:37 CET] <chanmyae> I would like to make text and image animation on video using ffmpeg in android development.
[04:30:12 CET] <chanmyae> Let me know sample or documentation?
[04:33:23 CET] <chanmyae> https://www.youtube.com/watch?v=wRciIdjLQI8
[04:34:06 CET] <chanmyae> Like video which is following above.
[06:53:33 CET] <shinchiro> Did anyone able to compile ffmpeg with libxml2 on Mingw?
[06:53:46 CET] <shinchiro> for some reason I got implicit declaration error
[06:53:51 CET] <shinchiro> src/libavformat/dashdec.c:496:16: error: implicit declaration of function 'xmlNextElementSibling'; did you mean 'xmlNewElementContent'? [-Werror=implicit-function-declaration]
[07:16:48 CET] <shinchiro> ah nvm. Found the culprit
[07:19:10 CET] <fella> shinchiro: anything that might be interesting to others?
[07:41:45 CET] <shinchiro> well, if you build libxml2 --with-minimum flags, you need to pass --with-tree to declare those functions
[09:50:12 CET] <voltagex> http://ffmpeg.org/pipermail/ffmpeg-user/2017-December/038298.html - downmixing + copying audio stream. Any ideas?
[13:41:09 CET] <nyuszika7h> how can I force showspectrumpic to show at least up to 22.05 kHz?
[13:42:14 CET] <furq> nyuszika7h: it should by default but it'll truncate the y axis if the height isn't a power of 2
[13:54:40 CET] <sfan5> just use spek instead :^)
[14:03:37 CET] <furq> use sox
[14:05:22 CET] <furq> assuming it's one of the few formats that sox actually supports without having to pipe it through ffmpeg first
[14:06:27 CET] <durandal_1707> sox is slow and sucks
[14:06:50 CET] <durandal_1707> spek is awfull
[14:06:52 CET] <furq> this is true but it does create nicer spectrograms than lavfi
[14:07:02 CET] <durandal_1707> it doesnt
[14:07:09 CET] <durandal_1707> fix eyesight
[14:44:22 CET] <milek7> there is some denoising audio filter?
[14:52:47 CET] <atomnuker> not yet, working on it
[15:36:07 CET] <therage3> what version of lame encoder does ffmpeg use?
[15:36:10 CET] <therage3> how can I tell
[20:09:58 CET] <Djfe> Hi, has anyone here compared ffmpeg's native mpeg2 encoder with x262? (just wanna squeeze the most out of a dvd I'm going to burn)
[20:14:17 CET] <Djfe> or is x262 not stable enough for use, yet?
[20:18:38 CET] <kepstin> I don't think the public version of x262 was ever really finished
[20:18:51 CET] <sfan5> http://webcache.googleusercontent.com/search?q=cache:pfhe3d9PEZMJ:johnwarburton.net/blog/%3Fp%3D42318+ seems to imply that x262 is better
[20:22:56 CET] <kepstin> you can tweak ffmpeg's mpeg2video encoder to do... well, almost as good as anything else, on dvds. It'll run pretty slow, and the settings are quite arcane
[20:24:57 CET] <kepstin> the main issue is that the bitrate/vbv limits on dvd are just terrible.
[20:32:30 CET] Action: kepstin should actually try out x262 with some dvd encodes, see what it does.
[20:43:31 CET] <Djfe> thx for your replies! :)
[20:43:40 CET] <Djfe> very helpful
[20:46:11 CET] <Djfe> just found this: http://www.mpeg.org/MPEG/DVD/Book_B/Video.html
[21:19:37 CET] <Djfe> sfan5: later down he says in the comments (2 years later): I have lately found that using FFmpeg with the mpeg2video encoder and -q:v gives even better results than x262.
[21:36:30 CET] <kepstin> hmm, it would be interesting to see how a single pass with -q:v <low value> comparse to a 2-pass encode with -b:v <high value>
[21:38:39 CET] Action: kepstin notes that throwing on "-dia_size 784 -mbd rd -cmp rd -mpv_flags +qp_rd+skip_rd+cbp_rd+mv0 -subcmp rd -mbcmp rd" may improve ffmpeg's mpeg2 video encoder quality, but will definitely make it a lot slower.
[21:46:31 CET] Action: kazuma_ has never seen any of those switches before
[21:59:32 CET] <Djfe> :D
[22:38:53 CET] <diverdude> Hi, is it possible to obtain prebuilt dll files together with h files for ffmpeg for windows without having to built the entire library ?
[22:45:11 CET] <diverdude> anyone?
[23:11:42 CET] <Djfe> do you mean: https://ffmpeg.zeranoe.com/builds/
[23:11:45 CET] <Djfe> ?
[23:14:10 CET] <therage3> what version of lame encoder does ffmpeg use?
[23:14:11 CET] <therage3> how can I tell
[23:25:04 CET] <CoreX> therage3 use google to find out
[23:25:17 CET] <CoreX> or encode something with ffmpeg and check the metadata
[23:25:22 CET] <therage3> hmmmm
[23:26:16 CET] <furq> i don't think ffmpeg puts the lame version in the metadata
[23:26:27 CET] <furq> it definitely doesn't write the encoder details in the xing header
[23:27:19 CET] <furq> with that said lame hasn't had any updates that affected the sq for about 7 years
[23:27:28 CET] <furq> so it's probably not worth knowing
[23:35:46 CET] <therage3> furq: I see
[00:00:00 CET] --- Sun Dec 24 2017