[Ffmpeg-devel-irc] ffmpeg.log.20140810

[burek]

[00:37] <fajung> I've some avi (xvid/mp3) files and I want to convert them to mp4(x264/aac), how could I do it without losing vid quality ?
[00:39] <c_14> If I have to be pedantic, use -qp 0. In all other cases, read https://trac.ffmpeg.org/wiki/Encode/H.264
[00:39] <diesel420> you cant transcode from xvid to x264 without losing quality
[00:40] <c_14> x264 does have a lossless compression mode, so you can.
[00:40] <diesel420> oh, sorry
[00:40] <c_14> It just won't be any smaller (probably).
[00:40] <Dark-knight> mp4 container supports mp3
[00:41] <fajung> yes, but my smart TV is not that smart and has a bug with mp3 sound in videos, I get a 3 sec without sound, but with aac, no problems
[00:45] <fajung> thanks for the help
[01:50] <llogan> fajung: try -crf 18. it'll be goodnuff.
[01:50] <llogan> as mentioned in the link provided by c_14
[02:02] <ac_slater> hey all. I'm using avcodec_decode_video2() ... it seems the first time it's used, it returns the size but doesnt fill it's `got_picture_ptr` argument - indicating failure. I use it as the examples do and I cant seem to find out why it's failing
[02:03] <ac_slater> the second time called, it works and does its business on the first frame ... meaning it didnt change internal state or anything ... using ffmpeg/libav* 1.2
[02:05] <ac_slater> 1.2.5 ... to be exact
[02:08] <llogan> ac_slater: you may want to try the libav-user mailing list for FFmpeg library and API usage questions
[02:30] <smo_> hi
[02:35] <smo_> is it possible to do for exemple
[02:35] <smo_> ffmpeg -i http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_720p_stereo.avi -sn -c:v libx264 -c:a libvorbis -f matroska bbunny.mp4
[02:35] <smo_> then start clc immediately to read the bbunny.mp4 AND get the original video length
[02:36] <smo_> when i do things like that my players always report NAN:NAN or 00:00 as length
[02:36] <smo_> so no seek nothing :(
[19:28] <Mavrik> *grumbl*
[19:28] <Mavrik> why is the filter chain eating my frames at the end of file
[19:41] <jnvsor> Is it possible to change DAR with -c:v copy?
[19:56] <chris_99> just a quick question, ffmpeg can decode quicktime right?
[20:29] <hexhaxtron> How can I know if a video has a Creative Commons license?
[20:31] <Chaz6> Ask the copyright holder
[20:32] <hexhaxtron> Chaz6, isn't there metadata in the videos?
[20:33] <Chaz6> In my experience very rarely
[22:38] <Mavrik> chris_99, define "quicktime" :)
[22:38] <Mavrik> quicktime isn't a format per se
[22:38] <Mavrik> hmm... and why am I answering to a question from 2 hours ago
[22:38] <chris_99> heh
[22:38] <Mavrik> sorry :)
[22:39] <chris_99> quicktime_ffmpeg_decode: unrecognized color model 12 -- doesn't mean anything to you, per chance
[22:40] <chris_99> thats all i've got really, it's just output from a program called Cinelerra, and that's the only relavent error
[22:40] <Mavrik> hmm, a quick google shows that it's a cinelerra error yes :)
[22:41] <Mavrik> chris_99, can you do an ffprobe on your video and paste full output here?
[22:41] <Mavrik> ah, found source which generates the error in cinelerra: http://cinelerra-cv.org/devcorner/doxy/svn_2.1_r1056/html/qtffmpeg_8c-source.html#l00018 :)
[22:41] <chris_99> i'm not sure what that is, but in kdenlive and other video editors it works fine
[22:42] <Mavrik> chris_99, what what is?
[22:42] <chris_99> sorry, what ffprobe is
[22:42] <chris_99> hmm so it looks like cinelerra is the issue, looking at that code?
[22:42] <Mavrik> a video info tool, part of ffmpeg.
[22:42] <Mavrik> run it on your video.
[22:43] <chris_99> ok 1 tick
[22:44] <chris_99> http://pastebin.com/PAKxavCe
[22:45] <Mavrik> ah :)
[22:45] <Mavrik> is that some kind of small camera output?
[22:45] <Mavrik> Basically, cinelerra doesn't support YUVJ420P pixel format of video, just the standard ones
[22:46] <Mavrik> and that's why you get the error message
[22:46] <Mavrik> yuvj is a rather strange format tho, usually found in mjpegs and stuff
[22:46] <chris_99> ah, thanks for your help Mavrik it's 1080p output from a canon 60d
[00:00] --- Mon Aug 11 2014