[00:01] <waressea1cher2> now its less messy [00:01] <waressea1cher2> at first I was shocked [00:02] <llogan> yeah, and using testsrc as an input makes it a little more verbose [00:02] <llogan> althought easy to test [00:03] <waressea1cher2> c_14: that web page says "trac powered", maybe you haven't made any mistake ? [00:04] <llogan> basically all you need are: pad (or some other method to make a "canvas"), setpts, and overlay. and additional other filters for audio depending on what you want to do [00:05] <c_14> trac is just the wiki software. >Trac is an enhanced wiki and issue tracking system for software development projects. [00:08] <waressea1cher2> its always better to use one ffmpeg command with long filter chain rather than few with one filter in each ? like "ffmpeg -i input -vf filter1,filter2 output" is better then: "ffmpeg -i input -vf filter1 output1" and "ffmpeg -i output1 -vf filter2 output2" ? [00:09] <c_14> better is subjective, but you will spare yourself a lot of encoding and potential quality loss (depending on the codec used) [00:43] <smo_> hi [00:44] <smo_> i m trying the libx265 encoder and get lot of non-existing PPS (i try to open files with gst-launch and lide265) [00:44] <smo_> can do something for this ? [04:02] <causasui> can ffmpeg segment an audio file into files of an arbitrary length? or would I have to loop through the time stamps? [04:02] <causasui> e.g. take this 7 hour mp3 and segment it into 10 minute chunks [04:03] <c_14> look at the segment muxer [04:09] <_genuser_> dang, ffmpeg encoding same file seems to take longer. [04:09] <_genuser_> proably because normally I see it doing pass 1 really fast and second pass. this one seems to be reporting time much slower and not showing which pass it's on. [08:39] <isomorphismes> I'm following the Ubuntu ffmpeg compilation instructions [08:39] <isomorphismes> but at the end I got some errors on the ffmpeg make and make install. [08:39] <isomorphismes> There's no ~/bin/ffmpeg, probably as a result. [08:44] <isomorphismes> ok hold on [08:44] <isomorphismes> dpaste.de/UfTj [08:46] <isomorphismes> dpaste.de/0M7H is the longest i can get [08:47] <sacarasc> I have never seen strip say "blah is not a normal file" before. :| [09:03] <Fyr> guys! I run the following command: [09:03] <Fyr> ffmpeg -i 1.wmv -vcodec h264 -pass 1 -passlogfile n1 -threads 12 -psnr -vstats -profile:v baseline -preset veryslow -an -y -crf 18 -f rawvideo /dev/null && ffmpeg -i 1.wmv -vcodec h264 -pass 2 -passlogfile n1 -threads 12 -psnr -vstats -profile:v baseline -preset veryslow -crf 18 -acodec libfdk_aac -aq 8 -y 1.mp4 [09:03] <causasui> gesundheit [09:03] <Fyr> and get error: wrong bitrate, width, height or something else. [09:04] <Fyr> I always get this error when I try to run second pass. [09:05] <Fyr> I changed -crf on -b, tried -an, removed one-by-one presets, profiles. [09:05] <Fyr> recompiled fmpeg. [09:05] <Fyr> anyway, the same error. [09:18] <isomorphismes> sacarasc: what do you think that means? [09:18] <sacarasc> I don't know, you're going to have to wait for someone who might know. [09:18] <isomorphismes> ok cool no problem [09:18] <isomorphismes> TIA [09:21] <Fyr> fine [09:21] <Fyr> any ideas how to solve it? [09:21] <causasui> pastebin.com sux :\ [09:39] <sacarasc> Fyr: Can we have your paste? [09:42] <Fyr> how to make ffmpeg output to a file? [09:42] <sacarasc> Which OS? [09:42] <Fyr> I have a big part of output cut because of tmux. [09:42] <Fyr> Scientific Linux 6.3 [09:43] <sacarasc> ffmpeg blah &> cheese.txt [09:43] <Fyr> ok [09:44] <a141982112> when I press t while playing video subtitle switch from actual stream to -1, what does -1 stream mean [09:44] <a141982112> i am using ffplay to play [09:52] <Fyr> sacarasc: [09:52] <Fyr> http://pastebin.com/isTujsP3 [09:55] <sacarasc> Could be: [libx264 @ 0x3442f40] constant rate-factor is incompatible with 2pass. [09:55] <sacarasc> Try using 1 pass or a bitrate. [09:56] <Fyr> is crf constant-rate factor? [09:56] <sacarasc> Yeah. [09:57] <Fyr> how to choose bitrate? [09:58] <Fyr> the file has vbr with peak 10Mbps and average 8Mbps. [09:58] <sacarasc> Why do you want to do 2 pass? [09:58] <Fyr> it decrease filesize. [09:58] <Fyr> it means better compression. [09:59] <sacarasc> Do you have a specific size you want? [09:59] <Fyr> no [09:59] <Fyr> I need higher quality and lower file size. [10:00] <sacarasc> Then just use crf and single pass. Run a test of a high action scene and a low action scene, find the crf number you want and then use that for the whole file. (Or, just go for crf 20 straight off.) [10:00] <Fyr> how to find crf number? [10:01] <sacarasc> Higher is worse quality, but lower size, lower is higher quality but larger size. [10:01] <Fyr> so, how to find the proper value? [10:02] <sacarasc> ffmpeg -i blah.wmv -ss 10:00 -t 1:00 -an -c:v libx264 -crf X output.mp4 [10:03] <sacarasc> Do that with different values of X until you find the highest number you want. [10:03] <Fyr> and how to use psnr for it? [10:03] <Fyr> and analyze vstats? [10:04] <sacarasc> Just add them in. [10:23] <Fyr> PSNR Mean Y:47.956 U:51.159 V:51.581 Avg:48.823 Global:48.803 kb/s:5210.03 [10:24] <Mavrik> don't use PSNR to measure video quality ffs -_- [10:26] <Fyr> how to measure video quality? [10:26] <sacarasc> Eyes. [10:27] <Mavrik> Eyes. [10:27] <Fyr> I have a bad squint and dyslexia. [10:28] <Mavrik> measuring quality of video produced by codec with psycho-visual optimizations is totally wrong [14:24] <Fjorgynn> hey [14:24] <sacarasc> Hello. [14:24] <Fjorgynn> I did ffmpeg -i hey.wav to hey.flac [14:24] <Fjorgynn> but it lowered the bitrate from 700 kbps to 250 kbps [14:25] <Fjorgynn> why [14:25] <sacarasc> Because FLAC is lossless *COMPRESSION*. It makes wave files smaller. [14:25] <sacarasc> Without losing any of the quality. [14:25] <Fjorgynn> ok [14:29] <Fjorgynn> I am digitizing my music casettes and think it might be a good idea to save the lossless to, if mp3 isn't the right way for them [14:29] <Fjorgynn> or if I want to increase volume and such [18:50] <luc4> Hello! Anyone who can advice on a way to resample a video file to reduce the fps? [18:50] <luc4> Keeping quality unaltered I mean. [18:56] <c_14> I'm not sure you can change the fps without reencoding the video, and if you are using a lossy codec you will lose quality even if it isn't noticeable. [18:57] <luc4> c_14: ah ok, I see that probably by adding -vcodec it actually re-encodes and sets the frame rate. Thanks. [20:55] <waressearcher2> I found that page http://wjwoodrow.wordpress.com/2013/11/22/adjusting-video-contrast-brightnes... it suggest to use "-vf mp=eq2=gamma:contrast:brightness:saturation:rg:gg:bg:weight" for changing "gamma,contrast,brightness,saturation" is it right way ? because it uses "mp" for mplayer [20:58] <llogan> waressearcher2: that's one method, I suppose. there are many video filters available that can do similar stuff like the "curves" filter [23:47] <needmorespeed1> I've got frames and playback. Does ffmpeg have any queueing feature like a decoded picture buffer (DPB)? [00:00] --- Mon Jun 16 2014