[Ffmpeg-devel-irc] ffmpeg.log.20120318

[burek]

[02:02] <Shimmy_> Hey! Anyone has some spare time? Please read this issue: https://ffmpeg.org/trac/ffmpeg/ticket/747
[02:02] <Shimmy_> It's something already implemented in an external project, just need to sew it in FFmpeg
[02:05] <beastwick987> hey quick question, I am trying to do a 2 pass encode and it seems to come out that the final product is actually a bigger file size than the first pass.
[02:06] <beastwick987> Where can I find a good tutorial on the matter? I thought all I have to do is specify -pass 1 and -pass 2 to do this, but I guess it is not working properly :(
[02:07] <sacarasc> Did it follow the bitrate you specified?
[02:13] <beastwick987> yes I believe so
[02:13] <beastwick987> I mean, they are identical
[02:13] <beastwick987> otherwise it spits out an error
[02:37] <beastwick987> anyone know where I can find documentation on 2 pass encoding?
[02:38] <sacarasc> So, the second pass followed the bitrate you specified?
[03:02] <beastwick987> yes
[03:02] <beastwick987> the 2nd pass followed the bitrate specified
[03:11] <sacarasc> Then it doesn't matter, does it?
[03:11] <sacarasc> When I do 2 pass, the first pass output is usually /dev/null.
[08:00] <shreya> Hello,I need to pass a series of images to avcodec_encode_video..
[08:00] <shreya> Can 1 image be passed as 1 frame...or it needs multiple frames?
[08:00] <shreya> Please help
[09:57] <JacobS2> Hello, Is there any whay I can increase the size of the real-time buffer? I keep getting this error: "real-time buffer 155% full! frame dropped!"
[09:58] <JacobS2> this is the command: -f dshow -i video="screen-capture-recorder":audio="SoundMAX Digital Audio" -vcodec  libx264 -preset ultrafast -tune zerolatency -r 6 -async 1 -acodec libmp3lame -ab 24k -ar 22050 -bsf:v h264_mp4toannexb -maxrate 750k -bufsize 3000k -rtbufsize 20000k  -f mpegts udp://192.168.5.215:48550
[10:00] <JacobS2> this is the output: http://pastebin.com/SDYzGw2Y
[12:53] <JacobS1> anyone knows the proper way to use the pan filter ? I am trying to take a stereo input and mute one channel and get a stereo output with one channel muted
[12:53] <JacobS1> this is my command: -rtbufsize 100000000  -f dshow -i video="screen-capture-recorder":audio="SoundMAX Digital Audio" -vcodec  libx264 -preset ultrafast -tune zerolatency -r 10  -async 1 -f pan="stereo:c2=c2" -ab 32k -ar 22050 -bsf:v h264_mp4toannexb -b 614400 -f mpegts udp://192.168.5.215:48550
[15:23] <Goffredo> Trying to compile ffmpeg I get this error on arch linux 64 (libpulse is installed from repos)
[15:23] <Goffredo> /usr/lib/libsndfile.so.1: undefined reference to `vorbis_version_string'
[15:24] <Goffredo> any help?
[18:13] <PowerCC> Howdy!
[18:14] <PowerCC> could anyone tell me if there is a syntax in ffmpeg so when I'm upscaling say a 720p to 1080p to auto-guess the aspect ratio and/or pad.
[18:15] <PowerCC> or would I forever have to calculate 1280x528 is 1920x792
[18:20] <PowerCC> ?
[18:33] <PowerCC> good day
[18:36] <relaxed> PowerCC: -vf 'scale=1920:-1'
[18:37] <PowerCC> nice!
[18:37] <PowerCC> with quotes or without?
[18:38] <relaxed> I would say it's best to always quote the filter chain.
[18:39] <Kasper^> hi, noob with ffmpeg, need a bit of help
[18:40] <Kasper^> in doc/examples decoding_encoding.c in video_decode_example()
[18:40] <Kasper^> it's assumed that we know the codec, we open the files and begin decoding
[18:41] <Kasper^> is it possible to open the file and obtain the codec and begin decoding after ?
[18:41] <Kasper^> there used to be a avcodec_find_decoder() function before
[18:50] <PowerCC> Kasper^:  talking to me ;)
[18:51] <PowerCC> here is what I am trying to do
[18:52] <PowerCC> -vcodec mpeg2video -b 20971k -maxrate 30000k -bufsize 8388k -acodec ac3 -ab 448k -ar 48000 -vf 'scale=1920:-1' -f vob -
[18:52] <PowerCC> works great on my old devices.
[18:52] <PowerCC> gonna give it a spin.
[18:53] <PowerCC> No such filter: 'scale=1920:-1'
[18:53] <PowerCC> so with mpeg2 not possible.
[18:57] <Mavrik> of course it's possible, filters are codec independent
[18:58] <Mavrik> just how obsolete ffmpeg do you have?
[18:58] <PowerCC> Mavrik, it's working now.
[18:58] <PowerCC>  Stream #0.0(und): Video: mpeg2video, yuv420p, 1920x792 [PAR 1:1 DAR 80:33], q=2-31, 20971 kb/s, 90k tbn, 23.98 tbc
[18:58] <PowerCC> very nice!
[18:58] <Kasper^> hmm..
[18:58] <Kasper^> I am using the latest git
[18:59] <PowerCC> relaxed:  thank you very much for answering a n00b question.
[18:59] <PowerCC> i will now add this to my pytivo parameters too.
[18:59] <Kasper^> but I am not trying to use ffmpeg itself but the libavcodec/format/etc.. libs
[18:59] <Kasper^> trying to build an app that will read a video file frame by frame
[19:00] <Kasper^> I have some very old code that is not outdated due to the API changes
[19:00] <Kasper^> the closest is the doc/example code
[19:00] <PowerCC> relaxed: it worked without the quotes
[19:00] <Kasper^> but that one assumes the codec is known
[19:01] <PowerCC> -vcodec mpeg2video -b 20971k -maxrate 30000k -bufsize 8388k -acodec ac3 -ab 448k -ar 48000 -vf scale=1920:-1 -f vob -
[19:42] <Whoopie> Hi, I try to compile xdtv which uses ffmpeg. I had to replace guess_format by av_guess_format, and now, it shows these warnings on x64:
[19:42] <Whoopie> container-ffmpeg.c:50:5: warning: implicit declaration of function 'av_guess_format' [-Wimplicit-function-declaration]
[19:42] <Whoopie> container-ffmpeg.c:50:19: warning: assignment makes pointer from integer without a cast [enabled by default]
[19:42] <Whoopie> Function `av_guess_format' implicitly converted to pointer at container-ffmpeg.c:50
[19:42] <Whoopie> The problem is that the build in a Ubuntu PPA fails if there're are implicit conversions. How can I fix that?
[20:25] <Goffredo> anyone here using aarch who could help me compile ffmpeg with aac support?
[20:45] <granjero> Hi
[20:45] <granjero> Got problems to embed srt subtitles into mp4
[20:47] <granjero> ffmpeg -i movie.mp4 -i movie.srt -scodec copy -sameq moviesub.mp4
[22:36] <Yerodin> I'd like to convert a directory full of wmv's into avi with xvid and libmp3lame using ffmpeg. There are about 100 files so I'm looking for a solution not to enter every single file. Any ideas?
[22:37] <Tjoppen> for f in *.wmv ; do ffmpeg -i $f [other options] ; done
[22:38] <Yerodin> ty Tjoppen. What does "for f in ..." stand for exactly. Don't like to use something I didn't understand ;-)
[22:38] <Tjoppen> it's a small shell script
[22:39] <Tjoppen> on windows you could use a .bat file, but I don't recall the syntax. internet probably knows
[22:40] <Yerodin> No windows over here at all :)
[22:41] <Tjoppen> no worries then. I suggest reading a light shell scripting tutorial - comes in handy
[22:42] <Tjoppen> "bash tutorial" seems to generate lots of useful hits
[22:44] <Yerodin> I do have this now:
[22:44] <Yerodin> for f in *.wmv; do ffmpeg -i $f -map 0:0 -map 0:1 -threads 4 -aspect 16:9 -y -f avi -er 3 -acodec libmp3lame -ab 128k -ar 48000 -ac 2 -vcodec libxvid
[22:44] <Yerodin> But afaik I need to set an output file, doesn't I?
[22:45] <Yerodin> Tjoppen: Already bookmarked an bash tut but didn't have the time to actually start reading.
[22:45] <JEEB> ${f}.out.avi
[22:45] <JEEB> at the end
[22:45] <JEEB> or something
[22:46] <JEEB> you can either call out that f variable by just doing $f or "properly" putting lulzy curly braces around it
[22:46] <Yerodin> for f in *.wmv; do ffmpeg -i $f -map 0:0 -map 0:1 -threads 4 -aspect 16:9 -y -f avi -er 3 -acodec libmp3lame -ab 128k -ar 48000 -ac 2 -vcodec libxvid ${f}.avi
[22:47] <Yerodin> All I get is a > prompt...
[22:48] <Yerodin> Now I feel kinda nooby -.- I'm to stupid to type a command which does what I want :(
[22:49] <JEEB> for f in *.wmv; do ffmpeg -i $f -map 0:0 -map 0:1 -threads 4 -aspect 16:9 -y -f avi -er 3 -acodec libmp3lame -ab 128k -ar 48000 -ac 2 -vcodec libxvid ${f}.avi; done
[22:49] <Yerodin> Ah!
[22:49] <JEEB> for starts the loop's parameters, do does something for every loop, done means the loop's done
[22:49] <JEEB> http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-7.html
[22:49] <JEEB> see the for loop sample
[22:49] <JEEB> this is basically raping that kind of stuff into a one-liner
[22:50] <Yerodin> Thanks a lot!
[22:50] Action: Yerodin reading the link.
[22:50] <Freakshow> JEEB: 'raping' or 'wrapping' ? ;-)
[22:51] <JEEB> depends on if you like perl golf
[22:51] <Freakshow> lulz
[22:51] <Freakshow> touché
[22:58] <Yerodin> Is there a way to get ffmpeg to use all 4 cores at 100% ?
[23:00] <rainmaker1> Is there a way to get some stats from ffmpeg in 5 min interval for example?
[23:02] <rainmaker1> I am aware of http://www.pixiv.net/member_illust.php?mode=medium&illust_id=25903500
[23:02] <rainmaker1> ups :)
[23:02] <rainmaker1> I am aware of -vstats_file
[23:02] <JEEB> suddenly pixiv links in my #ffmpeg
[23:02] <rainmaker1> but it's simply to much..
[23:02] <rainmaker1> sorry for that :)
[23:03] <rainmaker1> someone posted that link on another channel..
[00:00] --- Mon Mar 19 2012