[Ffmpeg-devel-irc] ffmpeg.log.20160430

[burek]

[06:34:14 CEST] <prelude2004c> hey guys.. good evening.. what am i doing wrong here.
[06:34:15 CEST] <prelude2004c> http://pastebin.com/GtYhqWMf
[06:35:35 CEST] <prelude2004c> the basic idea is this.. i want to list all the media files in a folder.. shuffle them ... play one by one randomly forever... while the output .. never stop the segment.. what is happening right now is.. after a file is done, the segments start again from 0... basically i want the segment to keep going and i just want ffmpeg to keep spitting data at the segmenting
[06:35:40 CEST] <prelude2004c> any ideas ?
[07:33:13 CEST] <pinPoint> is ffmpeg faster than handbrake?
[07:33:48 CEST] <pinPoint> in transcoding/encoding of x264/x265?
[07:37:20 CEST] <pinPoint> or does handbrake use ffmpeg
[10:27:48 CEST] <Fyr> guys, if I need to cut a few pices into one video, will the following work:
[10:27:48 CEST] <Fyr> ffmpeg -i input.mp4 -ss 0:10:0 -t 30 -ss 0:19:10 -t 10 -c:v copy -c:a copy 1.mkv
[10:27:48 CEST] <Fyr> ?
[11:33:26 CEST] <nobirthanthou> hi
[11:34:11 CEST] <noobierthanthou> hi
[11:34:54 CEST] <noobierthanthou> is there anyone out there who wants to help a noob ?
[11:36:29 CEST] <Fyr> me
[11:36:39 CEST] <Fyr> but I'm a noob too.
[11:36:49 CEST] <Fyr> maybe, even noobier than you.
[11:37:07 CEST] <Fyr> let's compare our noobility.
[11:37:39 CEST] <Fyr> *noobship
[11:40:40 CEST] <pzich> noobierthanthou: this generally isn't a very active time for the chanel, but you're best bet is to share the command you're running and it's full output in a paste
[15:02:09 CEST] <qvAc> how do i do if i want to convert by this, but in bitrate 160, but from any? ffmpeg -i input.wav -c:a libfdk_aac -b:a 128k output.m4a ?
[15:02:15 CEST] <qvAc> https://trac.ffmpeg.org/wiki/Encode/AAC
[15:09:59 CEST] <pzich> qvAc: the -b:a flag sets the bitrate, so I think you want -b:a 160k?
[15:11:25 CEST] <qvAc> yes
[15:11:40 CEST] <qvAc> got this recently? Unknown encoder 'libfdk_aac'
[15:11:44 CEST] <qvAc> pzich:
[15:11:56 CEST] <furq> you won't have libfdk_aac unless you built ffmpeg yourself
[15:12:10 CEST] <furq> if you have a recent ffmpeg version then use -c:a aac
[15:12:28 CEST] <qvAc> well i used the windows static one
[15:12:43 CEST] <furq> yeah that doesn't have fdk
[15:12:59 CEST] <qvAc> do ihave to download it manually? and add?
[15:13:07 CEST] <furq> no you'd need to recompile ffmpeg with it
[15:13:14 CEST] <furq> or just use the builtin aac encoder
[15:13:32 CEST] <qvAc> ? :S
[15:13:45 CEST] <furq> 14:12:10 ( furq) if you have a recent ffmpeg version then use -c:a aac
[15:14:50 CEST] <qvAc> what is the recent furq ?
[15:15:03 CEST] <furq> anything newer than 3.0
[15:15:32 CEST] <qvAc> ffmpeg version N-79585-g268b5ae ?
[15:15:37 CEST] <qvAc> does that says anything?
[15:15:38 CEST] <furq> i'm not looking that up
[15:15:42 CEST] <furq> just run it and see if it works
[15:16:52 CEST] <qvAc> wow thanks seems to work :D
[15:17:09 CEST] <qvAc> furq: and pzich, thanks for the help :)
[15:48:02 CEST] <Prelude2004c_Zzz> hey guys.. i need a bit of help with somethign
[15:48:40 CEST] <Prelude2004c_Zzz> http://pastebin.com/raw/qwRPXZgz
[15:49:02 CEST] <Prelude2004c_Zzz> how do i do it where the input keeps looping the files without closing the output.. issue right now is that the segmens start at 0 everytime a file changes
[15:56:36 CEST] <c_14> You're probably going to have to use the concat demuxer or similar
[16:11:20 CEST] <__jack__> can I encode a file using the same codecs, same streams, but differents per-codecs params, in two outfiles, in the same run ? I would like to grab the input, and output a fullHD and a SD
[16:12:12 CEST] <furq> __jack__: -c:v libx264 -s 1920x1080 out1.mp4 -c:v libx264 -s 800x480 out2.mp4
[16:13:25 CEST] <__jack__> awesome !
[16:13:42 CEST] <__jack__> furq: can I control "shared" options ? say, I want the same params for audio
[16:14:02 CEST] <furq> you have to specify all the params for each output file
[16:14:33 CEST] <furq> there's probably some fancy way to avoid doing that but it'll end up being more complicated than just duplicating the params
[16:14:59 CEST] <__jack__> ok, thx :)
[16:15:47 CEST] <__jack__> btw, just tested the last ffmpeg code from 3.0, and the aac encoder that someone talked about (maybe c_14 ?), looks awesome ! I will probably  drop libfdk_aac
[16:16:25 CEST] <furq> fdk is probably better (pending a proper listening test) but it's debatable whether it's worth compiling your own ffmpeg binaries for it any more
[16:16:43 CEST] <furq> if you're building your own ffmpeg anyway then i'd stick with fdk
[16:17:12 CEST] <__jack__> I do, but I want to stop that
[17:35:57 CEST] <Pericles> there's a video of a length 2:41:46. there is some scene A at 0:53, how can i change the video such that the scene A occurs instead on 0:34?
[17:36:05 CEST] <Pericles> shortening the video seems to be the option but how?
[17:42:08 CEST] <sfan5> Pericles: you cut 19s from the beginning by doing ffmpeg -i video.avi -ss 19 video_cut.avi
[17:42:31 CEST] <furq> that'll reencode
[17:42:35 CEST] <sfan5> depending on the codec(s) you can try adding -c copy and see whether the cut is still accurate enough
[17:42:39 CEST] <furq> yeah
[17:43:11 CEST] <thebombzen> hey I have a question. how is rawvideo arranged? i.e. if I have ffmpeg dump rawvideo as yuv420p, is it a frame of Y, a frame of Cb, and a frame of Cr, or does it interleave them?
[17:43:33 CEST] <JEEB> YCbCr, 4:2:0, planar
[17:43:40 CEST] <thebombzen> planar?
[17:43:45 CEST] <Pericles> sfan5; its a mp4
[17:43:46 CEST] <JEEB> so the planes are separate
[17:43:50 CEST] <sfan5> rawvideo looks however the pixel format is
[17:43:57 CEST] <sfan5> in this case yuv420p means what jeeb said
[17:44:07 CEST] <thebombzen> oh okay. thanks
[17:44:12 CEST] <sfan5> Pericles: the filenames were just an example
[18:14:54 CEST] <thebombzen> what is the value range of the YCbCr that comes out of FFmpeg?
[18:17:42 CEST] <c_14> Full or Limited, depending on the input and options passed
[18:23:38 CEST] <JEEB> thebombzen: http://ffmpeg.org/doxygen/trunk/structAVFrame.html
[18:23:49 CEST] <thebombzen> thanks
[18:23:54 CEST] <JEEB> the color_range thing tells you what the range is
[18:24:09 CEST] <JEEB> AVFrame is how you get your decoded pictures
[18:31:00 CEST] <aletorrado> Hi! Anyone has tried NVIDIA NVENC (third gen.) for H264 encoding?
[18:32:24 CEST] <c_14> I've experimented with it
[18:33:26 CEST] <aletorrado> What about performance and quality? Is it good enough?
[18:34:30 CEST] <c_14> The quality/bitrate/speed of x264 is better
[18:34:45 CEST] <c_14> But if you really don't have any cpu time, go for it.
[18:34:51 CEST] <c_14> It has its uses, generic encoding is not it
[18:35:16 CEST] <aletorrado> Yeap I know, but I need to encode about 10 live streams in adaptive bitrates
[18:35:34 CEST] <c_14> You can only encode a max of 2 streams per GPU anyways
[18:35:39 CEST] <c_14> So there's no real point
[18:35:50 CEST] <c_14> Getting a cpu/cpus is better
[18:35:57 CEST] <aletorrado> That's for GeForce, but not Quadro
[18:36:16 CEST] Action: c_14 has never tested with that
[18:36:19 CEST] <aletorrado> Quadro doesn't have that limit
[18:36:48 CEST] <aletorrado> I know, anyways it's the same GPU
[18:37:28 CEST] <aletorrado> Which GeForce card have you used? Do you have any reference of settings&FPS?
[18:48:43 CEST] Action: c_14 can't remember. Was a while ago.
[20:46:10 CEST] <flux> how about power-wise?
[20:46:25 CEST] <flux> I guess it depends on your CPU.
[20:46:35 CEST] <flux> unless it takes very little on GPU?-o
[20:49:15 CEST] <pigoz> 1
[20:49:26 CEST] <pigoz> sorry
[23:48:34 CEST] <hyponic> it seems that ffmpeg's m3u8 muxer removes the index teletext page. can anyone confirm that?
[00:00:00 CEST] --- Sun May  1 2016