[Ffmpeg-devel-irc] ffmpeg.log.20160202

[burek]

[00:33:57 CET] <kbarry> I think 'ffprobe' is the right tool to learn "what kind of stream is this"
[00:49:02 CET] <hurstly> what sort of things can you use ffprobe for and is there any examples for it?
[00:49:47 CET] <c_14> https://trac.ffmpeg.org/wiki/FFprobeTips
[00:50:47 CET] <hurstly> thanks :)
[03:12:17 CET] <hawke__> hows it going anyone home
[03:12:32 CET] <dystopia> evening hawke__
[03:12:38 CET] <hawke__> hey dystopia
[03:12:56 CET] <hawke__> he do you know how to install from a clone ffmpeg onto centos
[03:13:03 CET] <hawke__> hey not he
[03:13:58 CET] <dystopia> i don't sorry, but stick around, im sure someone else will be able to help
[03:14:09 CET] <hawke__> thanks
[03:32:23 CET] <J_Darnley> hawke__: what's wrong with ./configure && make && make install?
[03:33:01 CET] <hawke__> nothing im a noob at centos didnt know it was that simple
[03:33:21 CET] <hawke__> just do it from the ffmpeg clone directory right
[03:36:45 CET] <J_Darnley> yes
[03:36:57 CET] <J_Darnley> the installing is optional
[03:37:09 CET] <J_Darnley> you can just run it from the directory you build it in.
[04:02:43 CET] <hawke__> thanks
[04:02:47 CET] <hawke__> got it to work now
[04:02:57 CET] <hawke__> just having issue with ampache streaming
[04:03:12 CET] <hawke__> but i am going to find ampache channel for that
[04:03:16 CET] <hawke__> thanks a million
[04:21:39 CET] <wizkid057> there a good way to downmix 5.1 to stereo with VLC-like results?
[06:18:23 CET] <dystopia> wizkid057 use ffmpeg to demux the audio, then encode it with nero's aac encoder or qaac, then remux
[08:52:33 CET] <markusl> good morning, anonyoe awake with DASH (webm_chunk and webm_dash_manifest) knowledge? I've got the problem that those commands http://pastebin.com/22zHuGdE (output: http://pastebin.com/bLaBbS7r) give the same bandwidth= in manifest for all live streams even if they're encoded differently
[09:20:29 CET] <siery> hey, I was trying to set up streaming channel with ffmpeg, but I'm getting all the time error: [x11grab @ 0x1178f40] Cannot open display HDMI-1, error 5.
[09:20:29 CET] <siery> HDMI-1: Input/output error
[09:21:35 CET] <siery> I write a simple script in bash to do that, but even when i type directly the command -i and then screen input I'm getting this error
[09:23:40 CET] <siery> I'm using Debian Jessie. And I think i install all dependences. Is there something more i need to specify? Maybe someone can review my script?
[10:38:42 CET] <Ajay_> Hi
[10:39:16 CET] <Ajay_> i wan't to know the status of .webm container support in ffmpeg
[10:39:30 CET] <Ajay_> .webm (vp8 + vorbis)
[10:40:02 CET] <Ajay_> file recorded with sample https://webrtc.github.io/samples/src/content/getusermedia/record/ in firefox & chrome-canary
[10:40:43 CET] <Ajay_> but am unable to process it with latest ffmpeg stable build on windows 32'bit server
[10:40:57 CET] <Ajay_> is it a known issue ?
[11:45:37 CET] <roxlu> When I concat multiple ts streams with ffmpeg, does it increment all the PTS/PCR values? Or does it restart when a new stream is appended?
[11:55:27 CET] <Mavrik> roxlu, PTS depends on your -copyts, PCR is always restamped.
[11:56:28 CET] <roxlu> Mavrik, ok awesome thanks! So is stream A ends with e.g. PCR = 10:01, then it will get e.g. 10:02 when stream B is appended ?
[11:56:40 CET] <roxlu> i.e. the PCRs increment
[11:56:43 CET] <Mavrik> PCR is applied on the output muxer
[11:56:54 CET] <Mavrik> So it should be monotonously incremented.
[11:57:03 CET] <roxlu> Okay thanks Mavrik !
[11:57:08 CET] <Mavrik> Even though I'm not sure what mpegtsenc.c does in all cases.
[12:04:38 CET] <Workday> does ffmpeg traverse through the whole video file to get total frames?
[12:05:02 CET] <Workday> regards to mpeg-2
[12:05:20 CET] <HiddenWolf> Does ffmpeg allow to set a subtitle as default on?
[12:08:41 CET] <tp_> theres no such thing as a default flag for subtitles
[12:09:09 CET] <tp_> its all up to your video player to decide
[12:11:51 CET] <HiddenWolf> hm.
[12:12:28 CET] <HiddenWolf> If I start the source file in vlc, it defaults to English subs, if I test-encode a bit of it, I can select the subs, but they're not automatically started.
[12:16:16 CET] <HiddenWolf> Oh well. Plex can handle that.
[12:21:22 CET] <Mavrik> Maybe you're just losing the subtitle language flag
[12:21:25 CET] <Mavrik> And the player doesn't enable them.
[12:56:36 CET] <Ajay_> but am unable to merge .webm(vp8+vorbis) video file with latest stable build on windows 32'bit server
[12:56:40 CET] <Ajay_> any idea ?
[13:35:32 CET] <FirePowi> Hi, is it possible to directly impose subtitles with ffmpeg, please ?
[13:36:56 CET] <J_Darnley> What do you mean by "impose"?
[13:37:01 CET] <J_Darnley> FirePowi ^
[13:37:32 CET] <J_Darnley> ffmpeg can render subttles onto video quite easily.  See the subtitle video filters.
[13:38:18 CET] <FirePowi> J_Darnley, I mean that I want the subtitled to be in video output.
[13:38:39 CET] <zylthinking> hi, I use ffmpeg to wirte aac to mp4, I can write the file without any warning, but the result mp4 file fails to being played
[13:38:49 CET] <zylthinking> the code is at http://sprunge.us/egEC
[13:39:22 CET] <J_Darnley> In what?  By what?  Can ffmpeg decode the files you write?
[13:40:13 CET] <zylthinking> I have not try ffmpeg, while, the vlc fails to play
[13:40:58 CET] <FirePowi> J_Darnley, testing.
[13:41:10 CET] <zylthinking> vlc can show there is a aac stream in mp4, with sample rate 44100 strearo, while,  in fact it is 8000 & mono
[13:44:21 CET] <zylthinking> ffprobe shows: Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 23 kb/s (default)
[13:44:30 CET] <FirePowi> J_Darnley, It work ! Thanks :8)
[13:44:42 CET] <FirePowi> I meant :-) *
[13:48:53 CET] <zylthinking> chrome in mac seems plays it well
[14:04:44 CET] <J_Darnley> zylthinking: perhaps you should also ask you question on FFmpeg's libav-user mailing list.
[14:07:05 CET] <zylthinking> ok, thanks, some one figures that because of sample rate does not specified in mp4,  while, he does not say how to specify it. I have specified the information in AVcodecContext, seems is not  enough. I will research
[14:25:37 CET] <bove> Is there a way to limit macroblock size in ffmpeg? I am getting an XDCam file rejected with this error: "MB Size exceeds limit. MB No. 7271 was found to be of size 6793. Max allowed is 6144."
[14:27:42 CET] <bove> Is mblmax what I am looking for?
[14:43:05 CET] <leventel> hello
[14:45:02 CET] <spaam> Hello and welcome to #ffmpeg
[14:46:04 CET] <relaxed> bove: what was your command?
[14:49:58 CET] <bove> relaxed: Basically -target xdcamhd422. This was in ffmbc, but I am assuming the required setting would be compatible
[15:10:35 CET] <roxlu> Mavrik, when I concat two TS streams with ffmpeg the PCR intervals are to far apart. Do you maybe know if there is a flag to change the PCR interval?
[15:12:15 CET] <roxlu> hmm http://ffmpeg-users.933282.n4.nabble.com/MPEGTS-no-PCR-when-muxing-H264-td2989848.html  same issue .. way back
[15:19:53 CET] <DHE> I've had a similar issue. Using CBR mode (-muxrate parameter) does generate PCR in reasonable increments, with obvious downsides...
[15:20:10 CET] <DHE> I had ffmpeg drop a PCR every 2 seconds (the keyframe interval)
[15:26:13 CET] <roxlu> DHE, ah thanks! Do you maybe have a full command?
[15:39:57 CET] <DHE> roxlu: just add "-muxrate 5M" or such before the output filename. you may have to experiment with different values if you don't know the actual necessary rate
[15:40:08 CET] <DHE> you should get errors if you choose too small a value
[15:40:45 CET] <roxlu> Ok thanks DHE
[15:41:03 CET] <DHE> concatenation isn't what I was doing, so check it out first. otherwise you may need to do timestamp manipulation
[15:41:45 CET] <roxlu> DHE, does ffmpeg have support to that too?
[15:43:11 CET] <DHE> yes, check the manual. Check -vsync, including all the comments around it
[16:12:39 CET] <Ccdc_DuckZ> hello, can somebody point me to the right functions (or even a tutorial) on how to save an animated gif from ffmpeg? I've never used this library before, so I'm not sure where to start from
[16:23:04 CET] <furq> Ccdc_DuckZ: the binary or the library
[16:23:13 CET] <furq> if it's the binary then ffmpeg -i input.video output.gif
[16:23:23 CET] <Ccdc_DuckZ> ah sorry, library
[16:32:46 CET] Action: HiddenWolf is amazed at the efficiency of x265
[17:03:08 CET] <aworan> Hi all, I am using ffmpeg on my raspberry pi 2 under Ubuntu mate. I recompiled ffmpeg to enable mmal decoders and it work great. I have a question to makes things better on raspberry pi. By default, ffplay or another 3part software like Firefox use h264 decoder. So I want to do a build (modifying source code if needed) to replace h264 decoder code by h264_mmal decoder. Do you think it is possible ? Or a stupid idea ?
[17:07:14 CET] <c_14> It should be possible. You'd probably have to remove the AVCodec struct in libavcodec/h264.c and add one in libavcodec/mmaldec.c that has the same name but all the other entries from the mmaldec struct. I can't say whether or not it's a stupid idea though.
[17:11:14 CET] <aworan> Thank you c_14 ! I will try it
[17:11:35 CET] <c_14> wm4's comment in #ffmpeg-devel might be better
[17:12:12 CET] <c_14> at the very least less hacky
[17:12:25 CET] <aworan> Ok
[17:12:42 CET] <aworan> I will do that instead ;)
[22:26:36 CET] <Halidith> Hi, im trying to make a playable file from a m3u8 playlist with 191 segments. but i get the error Failed to open segment of playlist 0
[22:46:22 CET] <lmat> Here's a script I use to play music: http://sprunge.us/UUeW
[22:47:11 CET] <lmat> By default, it plays all the files in ./* in order. You can pass files to play. You can play ./ recursively, and you can pass directories to be read recursively, and the files can be random-sorted.
[23:39:35 CET] <cokomoko> hi
[23:46:54 CET] <shadow42085> ok what packages do i need to Cross-Compile to build ffmpeg for windows
[23:47:47 CET] <shadow42085> i have all of the dev packages for linux native built and installed
[23:52:57 CET] <shadow42085> anyone or am I in the wrong channel?
[23:59:58 CET] <genii> shadow42085: You might want #ffmpeg-devel  , as per the /topic
[00:00:00 CET] --- Wed Feb  3 2016