[Ffmpeg-devel-irc] ffmpeg.log.20200119

[burek]

[01:00:41 CET] <imstig> Hey all -- trying to compile ffmpeg on an ubuntu 18.04 machine. I'm running into issues with pkg-config not finding "opus"
[01:00:55 CET] <imstig> although, when I do pkg-config --list-all it is included in there and installed
[01:01:00 CET] <imstig> any ideas?
[01:12:36 CET] <BtbN> It's probably too old?
[01:36:20 CET] <imstig> BtBN: what is too old?
[01:36:31 CET] <imstig> opus exists and is in the path
[01:37:01 CET] <BtbN> Yes, but it can still be too old
[01:37:08 CET] <BtbN> 18.04 is quite dated at this point
[09:17:38 CET] <void09> anyone here that can help me try to figure out why ffmpeg cuts a video with 1 frame difference given the same -to time , but different -ss time ?
[09:17:49 CET] <void09> 1 frame difference at the end, of course
[10:34:22 CET] <TheAMM> Something something frames having durations?
[18:45:46 CET] <KingBoomer> how can i create a single gif from several other gifs?
[19:21:48 CET] <nicolas17> KingBoomer: you mean playing one after the other?
[19:25:10 CET] <KingBoomer> nicolas17: simultaneously
[19:25:29 CET] <KingBoomer> e.g say i have 4 component gifs, gif-1, gif-2, gif-3, gif-4
[19:25:33 CET] <nicolas17> one on top of the other, or tiles, that kind of thing?
[19:26:07 CET] <KingBoomer> nicolas17: tiles
[19:26:16 CET] <KingBoomer> i think that's the correct term
[19:26:26 CET] <nicolas17> see the hstack, vstack, and overlay video filters
[19:28:42 CET] <KingBoomer> thanks, i'll take a look
[19:32:28 CET] <cehoyos> There is also xstack specifally for 2x2 and similar layouts
[19:32:39 CET] <nicolas17> cehoyos: I didn't know that, cool!
[19:33:06 CET] <nicolas17> I thought you'd have to pipe two vstack into an hstack or viceversa, or use overlay
[19:33:21 CET] <nicolas17> xstack looks much simpler
[19:40:58 CET] <KingBoomer> how is xstack different from hstack?
[19:41:19 CET] <KingBoomer> xstack is only for a 2x2 grid?
[19:41:42 CET] <KingBoomer> well, an n by n grid
[19:41:50 CET] <KingBoomer> oh no
[19:42:11 CET] <nicolas17> hstack is only horizontal, vstack is only vertical, xstack is a grid
[19:42:32 CET] <KingBoomer> nicolas17: xstack seems to be whatever rectangular layout you want, no?
[19:43:15 CET] <durandal_1707> KingBoomer: read wiki, there is entry about it
[19:43:24 CET] <KingBoomer> ok thanks
[19:43:47 CET] <nicolas17> https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos%20using%20xstack
[19:43:52 CET] <KingBoomer> also, say i want to create a gif that plays a single frame for n seconds, and then another frame for b seconds, is this possible?
[19:46:02 CET] <KingBoomer> obviously i could just give ffmpeg the same frame n times, but that seems inefficient
[19:47:07 CET] <BtbN> Easily possible, but MUCH more efficient to do with a dedicated gif editor
[19:47:20 CET] <BtbN> Cause there you can just set the duration of each picture
[19:47:24 CET] <nicolas17> you'd need to craft a VFR video stream, right?
[19:47:29 CET] <KingBoomer> BtbN: it needs to be programmatic
[19:47:56 CET] <BtbN> I'm sure there's libraries dedicated to generating gif
[19:48:20 CET] <KingBoomer> ffmpeg seems way quicker than anything else i've tried
[19:48:40 CET] <BtbN> ffmpeg can generate gifs, but since gif does not really fit on the concept of video in the classic sense, so there are some oddities
[00:00:00 CET] --- Mon Jan 20 2020