[Ffmpeg-devel-irc] ffmpeg.log.20180204

[burek]

[02:47:25 CET] <FishPencil> Do bluray disc's use YUV420p?
[02:51:29 CET] <kepstin> FishPencil: yes (at least the h264 stuff does, I think it's restricted to that by the permitted profiles)
[02:52:39 CET] <FishPencil> Is YUV420p the most widely used color encoding method?
[03:02:13 CET] <kepstin> FishPencil: for computer video, yes (or formats with the same sampling, but different memory arrangements, like NV12 or YUYV)
[03:39:16 CET] <DHE> FishPencil: yes, unfortunately. some players (Quicktime, TVs with media support) just don't support the higher stuff
[06:20:24 CET] <FishPencil> Is there a better way to pack in that information without losing quality? 420p seems pretty good
[08:57:50 CET] <Bear10> By any chance does anyone know the correct job title for someone experienced in multimedia / rtmp / ott?
[08:58:16 CET] <Bear10> Basically someone who knows the ins and outs to make a streaming platform
[09:58:50 CET] <TaZeR> ffmpeg is pretty good, are there competing codecs though?
[10:03:15 CET] <durandal_1707> TaZeR: ffmpeg is not codec, its library
[10:03:55 CET] <TaZeR> oh, is there another competing one that i would be familiar with maybe?
[10:04:22 CET] <TaZeR> they usually have such catchy names
[10:04:31 CET] <TaZeR> well ffmpeg is catchy to me lol
[10:04:44 CET] <durandal_1707> TaZeR: opensource? no
[10:05:06 CET] <TaZeR> oh i see
[10:25:33 CET] <furq> TaZeR: it depends what you want to do
[10:25:40 CET] <furq> there's nothing else that does as much as the ffmpeg libs can
[10:26:18 CET] <furq> but if you e.g. just want to encode rawvideo frames to vp9 then you might just want to use libvpx
[10:26:51 CET] <furq> or vpxenc if you're talking about the cli
[11:43:42 CET] <volkan> hello guys
[11:44:09 CET] <volkan> i have and question about pcm_f32le 2 wav convert
[12:08:39 CET] <volkan> guys please look at this message
[12:08:39 CET] <volkan> Assertion failed: (el >= 0), function calc_energy, file psymodel.c, line 576.
[12:08:44 CET] <volkan> what is thiss ?
[12:36:16 CET] <yusa> Dont know, what are compiling and how and on which maschine?
[12:38:13 CET] <yusa> probably you forwarded a parameter greater or equal than zero to a function which expects negative values for this specific parameter :)
[12:58:26 CET] <volkan> i only use ffmpeg-cli tools
[13:08:17 CET] <atomnuker> upload the file somewhere
[13:08:40 CET] <atomnuker> also you're converting to aac for some reason
[13:18:03 CET] <volkan> hi @atomnuker
[13:24:03 CET] <volkan> i uploaded to dropbox link is https://www.dropbox.com/sh/70dwd368tp9yx4z/AAC05LwVXSSpleNuIQx6qnG-a?dl=0
[14:24:57 CET] <Joobla> hello,could anyone please help me with ffmpeg?
[14:25:18 CET] <volkan> what do u want to
[14:25:31 CET] <Joobla> i want to position watermark and it should lean not be in straith line i have no idea how to do it :(
[14:25:59 CET] <volkan> what type of watermark like soundriver ?
[14:27:11 CET] <Joobla> watermark image
[14:35:29 CET] <volkan> this can be possible but you need to watermark image which is transparent background
[14:54:01 CET] <Joobla> soo anyone knows how to put watermark a bit rotated?
[14:54:12 CET] <Joobla> i have transparent background mage
[14:54:32 CET] <Joobla> problem in settings is overlay=main_w-overlay_w-5:main_h-overlay_h-2 [out]
[14:54:39 CET] <Joobla> i can move and down left and right np with this
[14:54:52 CET] <Joobla> but how i rotate watermark a little angle why some %..
[14:55:08 CET] <volkan> i think rotate png file or use imageMagick
[14:55:30 CET] <volkan> pr write an script to for it
[15:00:32 CET] <furq> !filter rotate @Joobla
[15:00:32 CET] <nfobot> Joobla: http://ffmpeg.org/ffmpeg-filters.html#rotate
[15:18:03 CET] <Joobla> @furq l
[15:18:14 CET] <Joobla> where do you put the code?
[15:18:40 CET] <Joobla> i try imagemagic too
[15:22:17 CET] <Joobla> that feeling when you need to rotate image in ffmpeg and it feels like rocket science - https://www.youtube.com/watch?v=rQSmfR1_SVE
[18:05:46 CET] <Joobla> can anyone help me with some basic ffmpeg?
[18:10:54 CET] <zort> can anybody tell me what's wrong with my command? https://pastebin.com/CXGz7bgw
[18:14:18 CET] <zort> this works fine: https://pastebin.com/Bix7wpJP
[18:15:27 CET] <zort> oh mp3 can't contain aac...
[19:26:41 CET] <rapha> hi!
[19:30:33 CET] <rapha> i've the exact same problem as the guy at https://superuser.com/questions/538829/repairing-corrupt-mp4 (even same scenario, same error message -"moov atom not found"-), alas the file is 6.2GB in size, so the apparent solution using `untrunc` does not work. is it still possible to attach the final metadata block somehow?
[19:32:13 CET] <BtbN> probably not
[19:33:07 CET] <rapha> hmm
[19:36:10 CET] <rapha> that sounds unlikely unless Trump has now found a way to discriminate against rallies of bytes too large to his likings
[19:36:22 CET] <SortaCore> cut the file in half byte size and add mov atom to both
[19:36:29 CET] <SortaCore> could be >4GB size is killing a seek op?
[19:36:56 CET] <BtbN> what?
[19:37:02 CET] <BtbN> mp4 does not have a 4GB limit
[19:37:09 CET] <SortaCore> yea
[19:37:14 CET] <BtbN> it's just a damaged mp4 file
[19:37:22 CET] <BtbN> mp4 is 100% useless without a proper moov atom
[19:37:28 CET] <SortaCore> yea
[19:39:05 CET] <kazuma_> what is moov atom?
[19:39:24 CET] <SortaCore> basically metadata about how to read the video, normally appended at the end of the mp4
[19:39:36 CET] <SortaCore> if a mp4 recording is cut off, then the atom isn't added, so the file becomes unreadable
[19:39:50 CET] <kazuma_> i see
[19:43:05 CET] <SortaCore> my suspicion is whatever is trying to read or add the mov atom is using a 32-bit seek func and messing up
[19:43:13 CET] <SortaCore> but either way the atom's missing
[19:43:55 CET] <SortaCore> I see in the comment untrunc doesn't work for large files
[22:46:31 CET] <BaroqueLarouche> Hi! Ive been trying to get libav and friends to work in my C++ application and I cant get it to work. I am trying to generate a H.264 video with audio generated from a WAV file + frame grab from OpenGL using openFrameworks.  All I get is grabled audio and black images. Can anyone help me figuring out whats wrong ?
[22:46:33 CET] <BaroqueLarouche> https://github.com/mlarouche/PlaylistVideoGenerator/blob/master/src/VideoWriter.cpp
[22:46:53 CET] <BaroqueLarouche> ^ Heres the libav usage part in my code
[00:00:00 CET] --- Mon Feb  5 2018