[Ffmpeg-devel-irc] ffmpeg.log.20150903

[burek]

[05:46:11 CEST] <movedx> I'm currently running Firefox in a Xvfb display (Xvfb :99 -screen 1 1920x1080x24). When I try and record the buffer using ffmpeg (./ffmpeg -f x11grab -framerate 25 -i :99.1 -video_size 1920x1080 /var/log/selenium/video.mpg), the resulting video only appears to be the top left corner and covers about 150x150.
[05:46:26 CEST] <movedx> Any thoughts as to what I'm doing wrong here? Is it Firefox, Xvfb, or FFmpeg?
[06:01:39 CEST] <c_14> put -video_size before -i
[06:05:12 CEST] <movedx> c_14: Let me try that, thanks.
[06:07:57 CEST] <movedx> c_14: OK, that resolved it, to a point. Thank you. However it seems Firefox isn't taking up the whole screen. Sigh. I think that's likely Selenium or Firefox its self.
[06:09:57 CEST] <Sheraf> Hi everyone
[06:10:34 CEST] <Sheraf> i have a video and a png, the png is bigger than the video, so the png is cropped at the output
[06:10:43 CEST] <Sheraf> how can i make the output be the size of the png
[06:10:52 CEST] <Sheraf> ffmpeg -i out.ogv -i border.png -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -codec:a lscopy test.mp4
[06:24:16 CEST] <Sheraf> ?
[06:25:31 CEST] <movedx> You'll have to be patient and wait for someone to answer you (someone who knows the answer.)
[10:49:29 CEST] <stevenm> Sorry if this is slightly off topic... I guess it might not be if ffmpeg is used in the encoding :)     I'm kind of looking for something like HDBaseT - but instead of having to buy 'receivers' - just use a normal PC to tune in (e.g. a video stream on VLC) - any ideas?
[12:59:28 CEST] <DHE> Sheraf: the simple solution would be to resize the PNG. if that's not possible, -filter_complex lets you built a multi-in-single-out filter graph where you can scale the PNG and then feed it into overlay afterwards. (I would normally suggest this over scaling the video up)
[13:01:00 CEST] <DHE> stevenm: a quick reading of their web site suggests you'll need special hardware anyway on the PC side. if that comes to be, then it's possible ffmpeg will support it.
[13:01:29 CEST] <stevenm> DHE: I'm guessing you mean Sheraf ?
[13:02:51 CEST] <DHE> no
[15:47:51 CEST] <sspiff> Hi, is it possible to use FFplay (or another tool) to see a subtitle track displayed while listening to the audio, but without the video?
[15:48:27 CEST] <sspiff> I tried -showmode 1 but I'm not seeing any subtitles (though something else might be amiss)
[16:36:47 CEST] <Sheraf> DHE: i made it in 2 step, first step i add pad= to my actual video, which make it fit the size of my border.png, then i just overlay
[18:08:21 CEST] <DrBenway> why would the packet coming out of an encoder have a negative pts and dts?
[18:17:06 CEST] <satiender> Hello developers !!!
[18:17:42 CEST] <durandal_1707> hello
[18:17:47 CEST] <satiender> Hi .... Anybody use hstack filter in video processing with ffmpeg
[18:18:04 CEST] <satiender> if yes ! then please send a example of that
[18:18:10 CEST] <satiender> thank you !!
[18:18:45 CEST] <durandal_1707> you just need videos of same height
[18:19:00 CEST] <satiender> ok
[18:19:20 CEST] <satiender> have you any example og hstack or vstack filter
[18:19:21 CEST] <satiender> ??
[18:19:28 CEST] <durandal_1707> You can use scale filter to resize
[18:19:35 CEST] <satiender> no
[18:19:46 CEST] <satiender> I not want resize filter
[18:20:11 CEST] <durandal_1707> see fancy filtering examples in wiki
[18:20:20 CEST] <satiender> actually hstack make very funny video means that generate opposite
[18:20:24 CEST] <satiender> video
[18:20:36 CEST] <satiender> yes I see these all
[18:20:57 CEST] <satiender> but actually these all fancy filters are only use with ffplay
[18:21:08 CEST] <satiender> But I want use in ffmpeg
[18:21:17 CEST] <durandal_1707> what funny?
[18:21:44 CEST] <satiender> https://trac.ffmpeg.org/wiki/FancyFilteringExamples
[18:21:52 CEST] <satiender> see that link
[18:22:02 CEST] <satiender> you get it
[18:22:14 CEST] <satiender> but these all for ffplay not ffmpeg
[18:24:09 CEST] <durandal_1707> ffmpeg -f lavfi -i smptebars -f lavfi -i smptehdbars -lavfi hstack out.mov
[18:24:53 CEST] <satiender> can we change input file ??
[18:25:03 CEST] <durandal_1707> yes
[18:25:05 CEST] <satiender> like my own recorded video
[18:25:17 CEST] <satiender> song.mp4
[18:25:31 CEST] <durandal_1707> if they are of same height
[18:25:57 CEST] <durandal_1707> Or width for vstack
[18:26:12 CEST] <satiender> sorry but please tell what is smptebars ??
[18:26:42 CEST] <durandal_1707> video source
[18:27:12 CEST] <durandal_1707> Look in docs for more info
[18:28:48 CEST] <satiender> ffmpeg docs
[18:28:50 CEST] <satiender> ok
[18:29:01 CEST] <satiender> any link for particular that
[18:31:12 CEST] <durandal_1707> www.ffmpeg.org/ffmpeg-filters.html
[18:31:38 CEST] <satiender> Hi one another thing please help
[18:31:51 CEST] <satiender> I run following command
[18:32:32 CEST] <satiender> ffplay -i INPUT -vf "crop=iw/2:ih:0:0,split[left][tmp];[tmp]hflip[right];[left][right] hstack"
[18:32:53 CEST] <satiender> but there have error :  no hstack filter
[18:32:59 CEST] <satiender> why any idea
[18:33:01 CEST] <satiender> ??
[18:34:01 CEST] <durandal_1707> from where you got ffmpeg?
[18:34:56 CEST] <satiender> Actually I follow the instructions of ffmpeg compilation guide
[18:35:04 CEST] <satiender> for ubuntu
[18:35:42 CEST] <durandal_1707> When you downloaded source?
[18:36:42 CEST] <satiender> I did cloning from ffmpeg git hub site
[18:37:47 CEST] <durandal_1707> but when?
[18:38:20 CEST] <satiender> approximately 25 days ago
[18:38:36 CEST] <durandal_1707> hstack and vstack were introduced after that
[18:38:44 CEST] <satiender> ok
[18:38:54 CEST] <satiender> means these are new
[18:39:11 CEST] <satiender> now how I can update my ffmpeg
[18:39:15 CEST] <durandal_1707> You need to git pull and rebuild
[18:39:34 CEST] <satiender> ok
[18:39:39 CEST] <satiender> thank you
[18:39:52 CEST] <satiender> rebuild means
[18:39:59 CEST] <satiender> ./configure
[18:40:01 CEST] <satiender> make
[18:40:05 CEST] <satiender> &
[18:40:10 CEST] <satiender> make install ??
[18:40:26 CEST] <durandal_1707> yes
[18:40:40 CEST] <satiender> ok
[18:41:02 CEST] <satiender> git pull from ffmpeg github site
[18:41:06 CEST] <satiender> ??
[18:42:35 CEST] <satiender> I mean git pull from where ??
[18:43:40 CEST] <durandal_1707> cd to ffmpeg directory
[18:43:52 CEST] <durandal_1707> git pull
[18:44:52 CEST] <satiender> sorry for misunderstanding
[18:45:23 CEST] <satiender> but I use wget during downloading ffmpeg in that time means installation time
[18:45:44 CEST] <satiender> then what i can do now ??
[18:48:54 CEST] <durandal_1707> then wget it again
[18:50:01 CEST] <satiender> ok
[18:50:04 CEST] <satiender> thanks
[18:57:00 CEST] <satiender> durandal: have any idea about ffmpeg for android
[18:57:25 CEST] <durandal_1707> nope
[19:00:59 CEST] <satiender> ok
[19:01:15 CEST] <satiender> thank you !!
[19:01:37 CEST] <satiender> Good night hopefully meet again
[19:01:39 CEST] <satiender> :)
[20:51:48 CEST] <Billae> Is there a web site with many diffferent command line examples for how to convert from one file to another file
[20:52:34 CEST] <Billae> You can look up avi 2 mpeg4 or mp4 to flv on google, and you might find one, maybe two, but I wondered if there was a web page index or wiki with huge amounts of conversions
[23:44:10 CEST] <cryptopsy> how do i specify highest possible VBR that is still lossless or very close to it?
[23:44:27 CEST] <cryptopsy> ugh for mp3
[23:46:25 CEST] <blahkat> Hey guys and gals, I am trying to get this stream going as smooth as I possibly can, right now we are using openbroadcaster and we have nginx setup on our centos vps server, the audio is fine, however every 5 or 10 seconds or so it seems that the video will stuter or pause
[23:46:54 CEST] <blahkat> is there any possible way that I can fix this? either in my rmpt config in nginx or on the openbroadcaster side?
[00:00:00 CEST] --- Fri Sep  4 2015