[Ffmpeg-devel-irc] ffmpeg.log.20120915

[burek]

[03:06] <nebiki> i can't stream to twitch/own3d anymore with ffmpeg using rtmp, i get a black screen. old builds like the one i have from 07/2012 works fine. did anything change? with new builds i can record to my hdd without any problems, using the same settings as with streaming.
[09:07] <Tjoppen> file a ticket and use the old one until it's fixed
[12:22] <JamJams> Hi, I'm using the command line options of "-ss 0 -t 60" however if I do a length check I get 00:01:00.12. Is there anyway to fix that?
[12:31] <amaurea> When asking about a color matrix bug in #x264 they pointed me here. According to them, x264 does not correctly convert from RGB to bt709 because swscale does not allow one to set the colormatrix correctly for the RGB -> YCbCr conversion, only the other way around. Is that correct?
[12:43] <burek> JamJams can you please use a pastebin site (like www.pastebin.com) to show your ffmpeg command and the complete console output?
[12:44] <JamJams> One second
[12:48] <JamJams> burek http://pastebin.com/KNz4qwYt
[12:48] <burek> JamJams, please read more carefuly what I asked of you
[12:49] <JamJams> Oh the console output my mistake
[12:54] <JamJams> burek > http://pastebin.com/Tz6MSidw < Fixed :)
[12:56] <burek> ok, where do you 59.640
[12:56] <burek> do you see*
[12:57] <burek> also, you are using -c copy
[12:57] <burek> which means to copy whatever is on the input side
[12:58] <burek> so that obviously means you can't customize it at all
[12:58] <burek> it is what it is
[12:58] <burek> if you want it to be exactly one minute, you need to re-encode
[13:00] <JamJams> I was using -c copy, as I wanted an exact stream copy.
[13:00] <JamJams> So it'll never be exact, with a direct stream copy?
[13:02] <burek> well
[13:02] <burek> it's like a zip file
[13:02] <burek> you can cut only on some boundaries that make sense
[13:02] <burek> not just in the middle where you want it
[13:02] <burek> you might see how many frames there are
[13:02] <burek> in your output
[13:03] <JamJams> Ah
[13:03] <burek> and then repeat the original command, but instead of -t <num> use -vframes <num_of_frames+1>
[13:03] <burek> to see what will happen
[13:03] <burek> and to understand what am I talking
[13:03] <JamJams> I used vframes too, it was about 15 frames off.
[13:03] <burek> well yes, ffmpeg made a best effort to respect your -t 01:00
[13:04] <burek> it's the best you can get with copy method
[13:05] <JamJams> Ah
[13:05] <JamJams> Is there anyway to get the exact result within ffmpeg?
[13:10] <burek> yes, avoid -c copy
[13:10] <burek> and use -c:v ... -c:a ...
[13:10] <burek> as you need
[13:11] <burek> type ffmpeg -codecs to see all available codecs and choose one you need
[13:13] <burek> also do take note that not all your streams are copied to the output with just -c copy
[13:13] <burek> oh, you used -map :) ok, just ignore me :)
[13:13] <JamJams> Yep
[13:15] <burek> btw, why do you need an "exact" length of 1 minute
[13:24] <JamJams> Well that was how long the selection I was testing was.
[13:25] <JamJams> It could be 5:3:3.321 next time for all I know :P
[14:17] <alxgomz> hi, I am using ffmpeg to transcode video on the fly on my upnp server.
[14:17] <Mavrik> yay!
[14:17] <alxgomz> I want to embend subtitle in the stream, which container support subtitles AND stream
[14:17] <alxgomz> ?
[14:18] <alxgomz> is matroska streamable?
[14:19] <Mavrik> yeah
[14:19] <Mavrik> and it supports subtitles
[14:19] <Mavrik> however your player has to support MKV with subtitles as well
[14:19] <alxgomz> that's what i want to check ;) yes
[14:20] <alxgomz> thx Mavrik, I'll tell you my results
[14:28] <humbolt> are there any docs available, on how to create a high quality and standard conforming IPTV stream for STBs with ffmpeg?
[15:34] <alxgomz> Mavrik: can't find a player that support both matroska stream and subtitlles :(
[15:34] <alxgomz> thx anyway
[19:07] <dirty_d> im re-encoding a movie with subtitles and DTS audio to ac3 or aac audio, im getting this error: Only SUBTITLE_ASS type supported. Subtitle encoding failed
[19:07] <dirty_d> Stream #0:2 -> #0:2 (pgssub -> ass)
[19:07] <dirty_d> not sure what i need to do to fix that
[19:08] <JEEB> you're trying to convert picture-based subs to text-based
[19:08] <JEEB> can't you just -c:s copy?
[19:08] <JEEB> (sets the subtitle codec to copy)
[19:08] <dirty_d> ill try
[19:10] <dirty_d> yea that works, thanks. is there another syntax for that? like -scodec copy?
[19:10] <JEEB> could be
[19:10] <dirty_d> and -c:v -c:a etc
[19:10] <dirty_d> havent seen that before
[19:10] <JEEB> I've seen acodec and vcodec used, and -codec:a/v/s
[19:10] <dirty_d> ahh, ok
[19:10] <JEEB> but -c:a/v/s is the shortest
[19:21] <dirty_d> hmm, -c is different than -scodec
[19:21] <dirty_d> not entireley sure how
[19:22] <dirty_d> hmm maybe not
[19:22] <JEEB> -c:s is scodec
[19:22] <JEEB> -c is just... general, not sure what it will default to
[19:23] <dirty_d> yea, i canceled encoding then did -scodec and the fps was like 4 times higher, but i guess its because the work in the beginning of the output file was already done or something
[19:23] <dirty_d> although i though it would just overwrite it
[22:20] <humbolt> Does anybody know what "Fame Coding" is_
[22:22] <humbolt> And if somebody tells you, that he requires a keyframe every second and then states "720p (8/48) or 1080i (4/24)", what do the numbers in brackets mean?
[22:51] <JEEB> humbolt, probably minimum and maximum size of the GOP?
[22:52] <JEEB> "frame coding" is usually used to say that you want progressive stuff? not sure tho
[22:53] <JEEB> or if it has frame coding: <something> it might tell you that the <something> contains the info on how one wants the shit encoded (interlaced/progressive + possible other settings)
[00:00] --- Sun Sep 16 2012