[02:20:22 CEST] <whitestone> hello [09:13:39 CEST] <JAK-Zero> hey, I'm trying to find out the exact settings that the -preset options apply for x264 [09:14:16 CEST] <JAK-Zero> I tried `ffmpeg -h encoder=libx264` and it said `-preset <string> E..V..... Set the encoding preset (cf. x264 --fullhelp) (default "medium")` [09:14:32 CEST] <JAK-Zero> what does `cf. x264 --fullhelp` mean? [09:14:58 CEST] <Lypheo> JAK-Zero: see here: http://x264.janhum.alfahosting.org/fullhelp.txt [09:17:04 CEST] <JAK-Zero> oh thanks [09:17:18 CEST] <JAK-Zero> huh, they don't set crf? [09:17:46 CEST] <JAK-Zero> it doesn't look like it sets bitrate either [09:19:11 CEST] <Lypheo> why would they? it should be clear from the naming that the presets are meant to control speed, not quality [09:20:13 CEST] <Lypheo> (although they do have bearing on quality to some extent at a fixed CRF) [09:20:15 CEST] <JAK-Zero> oh, I thought you were picking compromises between speed and quality [09:20:41 CEST] <JAK-Zero> what's the downside of picking ultrafast then? [09:20:59 CEST] <Lypheo> terrible compression [09:21:12 CEST] <Lypheo> meaning bloated file size [09:21:29 CEST] <JAK-Zero> oh ok [09:23:44 CEST] <JAK-Zero> I think I understand now, thanks for the help [09:29:21 CEST] <Reinhilde> I have a progressive drop in recording framerate as the hours rack up. [14:52:57 CEST] <pbox> hi I'm using ffmpeg to stream from a VPS to youtube and twitch. the audio plays fine - using jack as source - but I tried to use x11grab for streaming the desktop and it only shows a black screen [14:53:56 CEST] <durandal_1707> use yuv420p format for output [14:54:25 CEST] <pbox> I did [14:55:05 CEST] <cehoyos> Does it work if you write to a local file? [14:55:15 CEST] <BtbN> x11grab on a VPS? [14:55:21 CEST] <pbox> in the -pix_fmt argument? [14:55:27 CEST] <pbox> BtbN: I have lxqt installed [14:55:36 CEST] <BtbN> Does the thing even have any kind of GPU? [14:55:44 CEST] <pbox> and can use vnc just fine. no it does not [15:02:52 CEST] <pbox> same thing happens when I write to disk [15:04:09 CEST] <pbox> BtbN: do you think I won't get it to work without a GPU? [15:04:27 CEST] <BtbN> maybe with full software framebuffer and rendering, but it will perform horribly [15:14:32 CEST] <pbox> BtbN: thanks. I'm trying to search how to set ffmpeg to use software framebuffer and rendering but can't seem to find anything online. I don't mind a horrible performance if I can get some visuals for now. is it very hard? [15:24:15 CEST] <asdjklnaskjdfgh> is there a way to list the codecs supported by a muxer? [15:25:58 CEST] <durandal_1707> nope [15:26:25 CEST] <asdjklnaskjdfgh> is there a reason for that? [15:26:33 CEST] <durandal_1707> yes [15:28:56 CEST] <asdjklnaskjdfgh> is there any way to see what combinations are possible? [15:29:09 CEST] <cehoyos> What muxer are you interested in? [15:29:36 CEST] <asdjklnaskjdfgh> I just want to write a little interface, where you can select a muxer and the codecs [15:29:37 CEST] <cehoyos> Some support any codec, some are very limited [15:29:49 CEST] <cehoyos> This is currently not easily possible. [15:30:31 CEST] <cehoyos> Feel free to check AVOutputFormat.codec_tag but it does not always help [17:13:23 CEST] <asdjklnaskjdfgh> Why does ffprobe show on some videos duration N/A, but when I open it manually it shows it under metadata? [17:16:56 CEST] <cehoyos> Command line and complete, uncut console output missing (I guess the metadata is ignored) [17:17:19 CEST] <asdjklnaskjdfgh> -v error -select_streams v:0 -show_entries stream=width,height,avg_frame_rate,duration -of default=noprint_wrappers=1:nokey=1 [17:27:26 CEST] <asdjklnaskjdfgh> this works ffprobe -v quiet -print_format json -show_format -show_streams [00:00:00 CEST] --- Sun Oct 27 2019