[Ffmpeg-devel-irc] ffmpeg.log.20150507

[burek]

[01:27:50 CEST] <Zeranoe> Has anyone had success building FFmpeg with libmfx using MinGW-w64
[05:12:46 CEST] <chankit> Hi, may I know who wrote the tiny_ssim.c in ffmpeg and how can I contact him/her?
[05:17:04 CEST] <c_14> https://git.videolan.org/?p=ffmpeg.git;a=commit;h=064146480b22d541c1c2e0c3e64c95c4370b777e
[05:17:18 CEST] <c_14> There's an email there, though whether or not they'll appreciate private email is another issue.
[05:17:41 CEST] <c_14> If there's a bug, open an issue on trac, if you have a patch send it to the devel mailing list.
[05:43:22 CEST] <almostworking> join #pydio
[05:43:26 CEST] <almostworking> ooops,
[08:13:33 CEST] <chankit> c_14: thanks. Will act appropriately
[08:39:07 CEST] <mobad> i've got a dump of an interleaved rtsp stream that i'm trying to convert to something playable. i made a little parser to parse out the h264 and g726 streams in to separate files but then i lose the sync between vid/aud
[08:39:50 CEST] <mobad> any idea on how i can combine them with the rtsp timestamps? (or just convert an interleaved dump to something else)
[08:42:22 CEST] <LexSfX> can ffmpeg be used to do hardware encoding on ios?
[08:42:33 CEST] <LexSfX> on, for example, an iphone
[08:44:49 CEST] <Mavrik> LexSfX, check if videotoolbox support is in yet
[08:45:10 CEST] <LexSfX> in ffmpeg?  okay
[08:45:15 CEST] <LexSfX> Mavrik: thanks
[09:03:47 CEST] <yvear> does ffmpeg support dts hd ma decoding now?
[09:28:15 CEST] <yvear> if so, it's not working for me. it's not detecting any channel > 6, being decoded as 5.1 is all it will do
[09:30:30 CEST] <yvear> can anyone confirm? I'm on windows btw
[10:02:38 CEST] <Gopu> hello can i send the patch as a attachement(git format-patch )?
[10:19:35 CEST] <spaam> yes
[10:19:57 CEST] <spaam> send it to the devel ml
[10:22:11 CEST] <spaam> Gopu: http://ffmpeg.org/developer.html#Submitting-patches related
[10:23:55 CEST] <Gopu> Spaam: thanks .., then i will attach my patch and send to ML
[10:33:33 CEST] <kath> hello. i am trying to convert an mp4 file to mp3. using ffmpeg -i name.mp4 nam.mp3  .. However i get http://paste.debian.net/172453/
[10:37:17 CEST] <spaam> kath: you need to enable libmp3lame to do it
[10:41:59 CEST] <kath> spaam: how do i do that
[10:42:00 CEST] <kath> ?
[10:49:15 CEST] <spaam> kath: how did you install ffmpeg?
[11:01:25 CEST] <sybariten> mornin
[11:59:54 CEST] <DrSlony> Hello, I'm using ffmpeg to make a video from a JPEG sequence. All the JPEGs fit in a 900x900 box but some are portrait, most are landscape. How do I tell ffmpeg to not stretch the portrait ones sideways, just to center them?
[11:59:56 CEST] <DrSlony> ffmpeg -f image2 -start_number 001 -i %d.jpg -an -c:v libx264 -preset slower -crf 23 vid.mp4
[12:50:53 CEST] <sybariten> i wish ffmpeg could be run with a simple-to-read ini file as only argument
[13:45:33 CEST] <Anoia> sybariten: what OS/environment?
[16:45:12 CEST] <boxgamex> anyone know what the maximum -rtbufsize is?
[16:45:56 CEST] <sopparus> hello
[17:13:14 CEST] <sopparus> ive set up a live555server
[17:13:21 CEST] <sopparus> am i supposed to be able to output to that?
[17:13:56 CEST] <sopparus> like -f rstp rstp://ip:port/mystream.sdp
[17:14:00 CEST] <sopparus> i get 405 errors
[17:15:39 CEST] <sopparus> http://pastebin.com/ccpCXcVL
[18:37:36 CEST] <jookiyaya> can you guys actually tell the difference between vc1 bluray vs  h264 bluray
[18:41:02 CEST] <sopparus> on a 100 inch 4000 euro projector you see all kind of stuff
[18:41:10 CEST] <sopparus> but on a "normal" tv, no way
[18:41:38 CEST] <sopparus> that doesnt mean I would see a difference
[18:41:47 CEST] <sopparus> but I saw a few movies on a procejtor like that
[18:42:09 CEST] <sopparus> and you could easily tell between a remux 30gb and a transcode to 20gb for example
[18:48:25 CEST] <jookiyaya> i see
[18:48:39 CEST] <jookiyaya> so is one better than the other even if you see the difference
[18:48:47 CEST] <jookiyaya> between vc1 bluray vs  h264 bluray
[20:33:39 CEST] <yvear> how do I set decoder for an individual stream of input file?
[20:50:50 CEST] <llogan> yvear: probably with -codec with a stream specifier http://ffmpeg.org/ffmpeg.html#Stream-specifiers
[20:51:49 CEST] <yvear> llogan, before -i right?
[21:05:32 CEST] <llogan> yvear: yes. as an input option
[21:06:35 CEST] <yvear> llogan, with a .mkv containing h264, 7.1 dts-hd ma, and ac3 in that order, doing   ffmpeg -c:a:0 libdcadec -i file.mkv   only shows 5.1 dts. it doesn't apply decoder
[21:07:31 CEST] <yvear> llogan, it works with -c:a libdcadec but then it treats the ac3 as dts...
[21:08:17 CEST] <llogan> it doesn't decode it properly by default?
[21:13:01 CEST] <DrSlony> Hello, I'm using ffmpeg to make a video from a JPEG sequence. All the JPEGs fit in a 900x900 box but some are portrait, most are landscape. How do I tell ffmpeg to not stretch the portrait ones sideways, just to center them?
[21:13:03 CEST] <DrSlony> ffmpeg -f image2 -start_number 001 -i %d.jpg -an -c:v libx264 -preset slower -crf 23 vid.mp4
[21:13:41 CEST] <yvear> llogan, no it doesn't   http://pastebin.com/VtVD8Ahy
[21:18:42 CEST] <yvear> llogan, see what I mean?
[21:19:09 CEST] <lakelord> Hi...in what repository for Ubuntu 14.04 can I find FFMPEG for install
[21:19:34 CEST] <llogan> lakelord: https://launchpad.net/~mc3man/+archive/trusty-media
[21:19:44 CEST] <llogan> or use a static build http://johnvansickle.com/ffmpeg/
[21:19:53 CEST] <llogan> or compile http://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
[21:19:59 CEST] <llogan> yvear: hold on
[21:21:28 CEST] <llogan> yvear: i meant what happens if you don't use -codec?
[21:21:29 CEST] <lakelord> llogan: it giver....Cannot add PPA: 'No JSON object could be decoded'.
[21:22:14 CEST] <llogan> lakelord: you'll have to go to #ubuntu for that
[21:22:36 CEST] <lakelord> llogan: ok...i figured out...I'm a dumbass
[21:25:38 CEST] <lakelord> llogan: I added the repository....now ehat ?  sudo apt-get install ffmpeg ?? that's it ?
[21:26:33 CEST] <llogan> read the link i gave you
[21:26:37 CEST] <_DragonsLordKERN> sudo apt-get update
[21:26:45 CEST] <_DragonsLordKERN> sudo apt-get install ffmpeg
[21:26:47 CEST] <_DragonsLordKERN> I guess
[21:33:50 CEST] <llogan> DrSlony: -vf "pad=900:900:(ow-iw)/2:(oh-ih)/2"
[21:36:05 CEST] <llogan> if you don't like the square box, then you can add a crop. pad,crop=iw:ih/2
[21:36:10 CEST] <DrSlony> llogan tool cool! Thank you! :)
[21:38:26 CEST] <llogan> DrSlony: you may have to add format for compatibility with shitty players: pad,crop,format=yuv420p
[21:39:04 CEST] <llogan> and -movflags +faststart if your viewers will be watching via progressive download
[21:50:02 CEST] <boxgamex> has anyone ever used ffmpeg to capture really large videos (like 4k) via dshow?
[21:50:10 CEST] <boxgamex> seems like I cant get the buffer large enough
[21:51:51 CEST] <DrSlony> thank you very much llogan
[22:10:42 CEST] <Smashcat> Hi, can anyone tell me if it's possible to export a .mov with transparency, as pngs with transparency? I've tried and it seems to add a white background.
[22:31:49 CEST] <Anoia> Smashcat: not in any standard way I'm aware of
[22:32:33 CEST] <Anoia> it'd be a feature of the player if it supported some sort of alpha
[22:32:44 CEST] <Smashcat> Anoia: Yes I've been looking and trying different options and can't see a way to do it. Going to request the designer exports as an image sequence from after effects if possible.
[22:37:06 CEST] <Anoia> what does it need to be transparent in/on?
[22:41:53 CEST] <anon-15634> Kind of weird question. DTS-HD MA is made by combining a lossy DTS stream with a diff track created by comparing the master track with the compressed track. Thus, when combined it is lossless, but on older/incompatible players, the lossy core is still playable. Has any research been done on doing this with lossy & lossless video? Ex. a lossy 1080p core + diff to get it back to source video
[22:42:20 CEST] <anon-15634> ffmpeg = audio / video enthusiasts; don't know where else to ask except maybe AVS forum
[22:45:11 CEST] <llogan> Smashcat: you could try -c:v qtrle
[22:45:26 CEST] <Smashcat> Anoia: It's part of an event installation, the image strips are over a coloured background.
[22:45:38 CEST] <Smashcat> llogan: I'll try it thanks
[22:47:22 CEST] <Smashcat> llogan: Not sure what that did, but I can't open the images it's created!
[22:47:35 CEST] <Anoia> in what? web browser? an app? an encoded video?
[22:47:59 CEST] <Smashcat> Anoia: In preview (Windows) - the file command reports it's just "data"
[22:48:58 CEST] <Smashcat> Command I used was: ~/ffmpeg -i iris-open.mov -c:v qtrle -f image2 open_%05d.png
[22:49:13 CEST] <llogan> oh, you're doing the opposite if what i thought you were
[22:49:20 CEST] <Smashcat> :)
[22:49:33 CEST] <Smashcat> Yeah the movie has transparency. I need to preserve it
[22:49:52 CEST] <llogan> please show the complete console output of: ffmpeg -i iris-open.mov
[22:49:55 CEST] <llogan> use a pastebin site
[22:50:06 CEST] <llogan> and then provide the link
[22:50:46 CEST] <Smashcat> http://pastebin.com/HSaASrzs
[22:53:39 CEST] <llogan> you should first get a recent ffmpeg build
[22:54:11 CEST] <llogan> then try with: ffmpeg -i input output_%05d.png
[22:54:28 CEST] <llogan> http://johnvansickle.com/ffmpeg/
[22:54:46 CEST] <Smashcat> llogan: Ok I'll try that
[22:58:56 CEST] <Smashcat> llogan: Nice! Thanks that worked great.
[22:59:43 CEST] <Smashcat> I used the exact same command line as above, and it preserved the transparency. So I guess it was added after the older version I was using
[23:01:00 CEST] <llogan> development is very active
[23:01:32 CEST] <Smashcat> llogan: haha, yeah I'll try to keep up to date with it :)
[23:02:44 CEST] <Smashcat> It's nice to be able to convert the video to images, then pipe that through "convert" to resize them all, then finally pipe that into "montage" to create the sprite strip automatically :)
[23:09:48 CEST] <llogan> Smashcat: you can resize them with ffmpeg
[23:09:55 CEST] <llogan> with scale filter
[23:10:09 CEST] <llogan> and a montage with tile filter
[23:10:29 CEST] <Smashcat> llogan: Couldn't get that to work - might have been the older version I was using. So I just created a shell script to do it all. Works fine though!
[23:25:03 CEST] <Smashcat> #politics
[23:25:33 CEST] <Smashcat> oops - pasting into wrong window - hahah
[23:43:58 CEST] <yvear> llogan, same as first
[23:50:10 CEST] <llogan> yvear: i can't really look into it now. try the ffmpeg-user mailing list.
[23:53:59 CEST] <yvear> llogan, ok ty
[00:00:00 CEST] --- Fri May  8 2015