[Ffmpeg-devel-irc] ffmpeg.log.20150712

burek burek021 at gmail.com
Mon Jul 13 02:05:01 CEST 2015

[00:03:45 CEST] <Dimtree> Nevermind, I'm an idiot. 'ffmpeg -codecs' reports full support for a52 by default.
[00:04:13 CEST] <Dimtree> Thanks for your help
[00:05:50 CEST] <courrier> Hey guys! I must downgrade my 60MB video to 10MB by keeping the best possible quality, is there a way to ask this to ffmpeg without a tweak-encode-and-retry approach?
[00:06:39 CEST] <BtbN> if you are aiming for an exact file size, you want to use 2pass encoding.
[00:15:01 CEST] <vee> is the current wiki page to create a pic-slideshow (https://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images) still applicable with version 2.7.1?   i am trying to make a 2-pic slideshow and seems the first pic is being displayed for approx 4s and the 2nd pic is displayed for a brief second using : "ffmpeg -framerate 1/5 -i img%03d.png -c:v libx264 -vf "fps=25,format=yuv420p" out.mp4".  I
[00:15:03 CEST] <vee> have fiddled with adding a -vframes   in there, changing the -framerate and fps= to various timings without success.
[00:16:08 CEST] <courrier> BtbN: could you detail a bit more what's the idea of using épass encoding for that purpose? I don't see the link at first ^^
[00:16:57 CEST] <BtbN> It's made exactly for that purpose. To get the best quality out of a given target filesize.
[00:17:22 CEST] <BtbN> the first pass collects data about the video, and the second pass uses that data to optimize the quality
[00:20:39 CEST] <courrier> BtbN: Oh ok thanks
[02:31:29 CEST] <noisykeyboard> Hi
[02:32:04 CEST] <noisykeyboard> I'm sorry to ask, but I've looked everywhere, is there a way to add cover art to opus files in ffmpeg?
[02:39:33 CEST] <noisykeyboard> anyone?
[02:47:11 CEST] <q3cpma> Hello, how would I do to emulate the R128 gain calculation and tag write of opusenc with ffmpeg's filter ebur128?
[03:20:43 CEST] <durandal_1707> noisykeyboard: same like to mp3 ?
[05:35:57 CEST] <techtopia> is there anyway to get ffmpeg to stop listening to keyboard imputs when it's running?
[05:36:31 CEST] <techtopia> like i was half way through a long encode, and went to type somthing in an irc window thinking it was active, but ffmpeg was the active window
[05:36:36 CEST] <techtopia> and it killed my encode
[05:36:52 CEST] <techtopia> it's happened before too, kinda annoying when it occurs
[05:47:50 CEST] <noisykeyboard> You could run it in the background
[05:48:42 CEST] <noisykeyboard> ffmpeg [command] &
[05:48:55 CEST] <noisykeyboard> then type fg to bring it to the foreground if you actually have to stop it
[06:05:48 CEST] <relaxed> techtopia: use screen or tmux
[06:06:13 CEST] <techtopia> tmux?
[06:06:20 CEST] <techtopia> whats that?
[06:06:29 CEST] <relaxed> it's like screen
[06:06:52 CEST] <techtopia> ahh just googled it
[06:06:57 CEST] <techtopia> im in a windows enviroment
[06:07:27 CEST] <relaxed> oh, I have no idea about windows
[06:07:34 CEST] <techtopia> it's ok i guess
[06:08:02 CEST] <techtopia> i like to have the ffmpeg window active becuase encoding fps goes up, but then i can accidently hit somthing on the keyboard and kill it
[06:08:09 CEST] <techtopia> i will just try not to do it heh
[06:12:31 CEST] <relaxed> techtopia: try, ffmpeg -i input output <NUL
[06:14:28 CEST] <techtopia> ok :)
[07:28:50 CEST] <chungy> also gnome-terminal lets you set a tab to read only mode. :P
[07:29:05 CEST] <chungy> but I just read Windows so :/
[08:02:53 CEST] <thebombzen> Hm. Wondering if FFmpeg could use VideoLAN as a host, at least in the meantime.
[08:10:02 CEST] <relaxed> thebombzen: host for what?
[08:10:34 CEST] <thebombzen> News, July 4th. >After graciously hosting our projects (FFmpeg, MPlayer and rtmpdump) for 4 years, Arpi (our hoster) has informed us that we have to secure a new host somewhere else immediately.
[08:10:52 CEST] <relaxed> ah, didn't see that
[08:10:53 CEST] <thebombzen> Git, Website, Trac, etc. that stuff.
[09:35:29 CEST] <phill_> morning ffmpeg
[09:36:48 CEST] <phill_> I'm trying to compile the source on a RaspberryPi and I'm getting the following error install: cannot stat `/usr/local/share/man/man3/libavutil.3': Input/output error
[09:36:49 CEST] <phill_> doc/Makefile:151: recipe for target 'install-man' failed
[09:36:49 CEST] <phill_> make: *** [install-man] Error 1
[09:37:10 CEST] <phill_> see for the full output http://pastebin.com/RH2LYWWV
[09:45:05 CEST] <chungy> might want to run fsck
[09:45:13 CEST] <chungy> or check that the fs isn't full
[09:57:15 CEST] <phill_> hi chungy fsck gave me warnings about damaging the fs, but I ran df and got: http://pastebin.com/3BPciwsD
[09:57:22 CEST] <phill_> looks like I've got enough
[09:57:44 CEST] <chungy> Don't run fsck on a live filesystem.
[09:58:12 CEST] <chungy> try "touch /.forcefsck" and then reboot
[09:58:47 CEST] <chungy> er, just /forcefsck actually
[10:06:28 CEST] <phill_> chungy: I got touch: cannot touch `/forcefsck': Permission denied
[10:06:33 CEST] <phill_> so sudo'd it
[10:07:02 CEST] <phill_> rebooting now
[10:10:49 CEST] <phill_> chungy: back up now what? try to make install?
[10:12:32 CEST] <chungy> yes
[10:13:54 CEST] <phill_> chungy: what was that supposed to do?
[10:14:13 CEST] <chungy> find/repair errors in the filesystem.
[10:15:40 CEST] <phill_> chungy: ahh ok thanks. thats why it took a little longer to reboot then!
[10:16:09 CEST] <phill_> chungy: its got past the sticking point! thanks for your help!
[10:16:35 CEST] <chungy> yeah an I/O error tends to mean something is wrong on the underlying system.
[10:16:50 CEST] <phill_> chungy: time for bed, I'm told this can take 5 hours in th Pi
[10:17:50 CEST] <phill_> chungy: pm me a paypal address an I'll pay for a beer
[10:20:06 CEST] <chungy> Thanks, but no need :)
[10:38:52 CEST] <phill_> chungy: if you change your mind ...
[22:26:27 CEST] <Kaedenn> How do I slow an audio file down to 25%?
[22:31:09 CEST] <durandal_1707> Kaedenn: see atempo filter
[22:32:35 CEST] <Kaedenn> Hmm... okay
[22:33:28 CEST] <Kaedenn> How do I use filters on the command-line?
[22:33:45 CEST] <Kaedenn> atempo has a value tempo that I can assign 0.5 to
[22:36:06 CEST] <Kaedenn> Hmm... -vf "tempo = 0.5" ?
[22:38:48 CEST] <DHE> -af I think... -vf is for a video filter
[22:45:55 CEST] <Kaedenn> Aha
[22:51:11 CEST] <BtbN> Is it any diffrent from asetpts?
[22:59:34 CEST] <durandal_1707> Yes
[23:12:23 CEST] <pisto> how do I use ffmpeg to create mkv files for streaming (as in http://matroska.org/technical/streaming/index.html)?
[00:00:00 CEST] --- Mon Jul 13 2015

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