MythLogBot@irc.freenode.net :: #mythtv

Daily chat history

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Friday, April 29th, 2011, 00:05 UTC
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[04:14:17] elmojo: jpabq: had time enough to determine if the ringbuffer change helps?
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[05:16:32] jpabq: elmojo, I am pretty sure it does help. Does not completely eliminate the problem, but it is reduced.
[05:21:10] elmojo: jpabq: same here, mostly eliminated but an occasional hiccup
[05:21:35] elmojo: the logs don't make much sense with relation to the problem
[05:23:07] jpabq: It is funny, but the last four shows I watched, where problem free until about the 75% mark, then I had a problem for a several seconds, and then it played fine until the end.
[05:23:14] jpabq: s/where/were/
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[05:34:43] elmojo: jpabq: there are some more ring buffer changes that I didn't revert in the patch – might need to see how big the file read size is getting on the backend
[05:35:37] elmojo: it was changed so that it grows by 50% every time the read occurs within a certain time – it used to grow by CHUNKSIZE which I think is 32KB
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[05:38:52] jpabq: When were those changes made?
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[05:44:52] elmojo: jpabq: if you git blame libs/libmythtv/ringbuffer.cpp you should see the commit of the line I changed
[05:46:03] elmojo: you'll have to do that on a 0.24-fixes checkout though
[05:48:36] elmojo: jpabq: here is is -> https://github.com/MythTV/mythtv/commit/961dc80a
[05:50:48] jpabq: thanks
[05:52:49] elmojo: looks like the max read size is capped at 640KB in the old code and is 1MB in the new code
[05:54:41] elmojo: jpabq: if you run -v file on the backend you'll get an "Avg read interval..." message every time the read size changes
[05:55:08] elmojo: might want to check if the problem only happens if the read size is small or large
[05:56:27] jpabq: Next time I watch, I will check that.
[06:00:02] elmojo: seems like the other big piece of that commit is to fix the locking – maybe something wrong with it
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[21:57:11] pladijs: are there known issues with the mythBE not shutting down on idle? I have made all changes to the backend-setup. mythshutdown -s (or -c) returns 0 (idle), but the word idle never appears in the BE log.
[22:05:30] Beirdo: you were already in the right place
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[22:09:03] pladijs: It's just that i see hints at that it might be a rare bug http://www.pcmediacenter.com.au/forum/topic/4 . . . page__st__15 but sorry for disturbing
[22:09:35] pladijs: I mean http://www.pcmediacenter.com.au/forum/topic/4 . . . utting-down/
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[23:20:55] jya: anyone using the "lossless" option of mythtranscode ?
[23:26:50] Beirdo: that's the MPEG2->MPEG2 cutting, no? I haven't tried it in ages
[23:29:21] wagnerrp: jya: there was some issue fixed a couple weeks back where it would never terminate after the last cut
[23:29:39] wagnerrp: it would just hang at 90–100% complete in the jobqueue logs
[23:29:46] jya: When I run it I get errors constantly
[23:29:51] jya: latest master
[23:30:09] wagnerrp: might be something to do with the ffmpeg sync?
[23:31:24] jya: http://pastebin.com/qWuCr2Jv
[23:31:27] Beirdo: wagnerrp: I fixed the "never terminate" part, did I not?
[23:31:50] jya: if I use the lossy transcode (mpeg4 / mp3) then it works fine..
[23:31:51] Beirdo: interesting
[23:32:12] Beirdo: you can't do "lossless" on anything but MPEG2
[23:33:02] jya: ah ok ...
[23:33:05] Beirdo: unless someone added a lot of code that slipped by me  :)
[23:33:12] Beirdo: which is always possible
[23:33:26] jya: I imported videos in my recordings, to test all case
[23:33:45] jya: unfortunately, those are either mkv or avi.. I have one mpg but it's AC3 stereo only
[23:33:46] Beirdo: that's a really nasty messy way to fail though
[23:34:04] Beirdo: it should check if the input is usable and if not, fail gracefully
[23:34:12] jya: well, it's not something you can see normally. this is an AVI I inserted in the recordings
[23:34:44] wagnerrp: Beirdo: "there was some issue fixed a couple weeks back"
[23:34:51] Beirdo: ah :)
[23:35:00] Beirdo: heh, I need more coffee. sorry
[23:35:26] jya: I need to find a mpg recording with 5.1 AC3 then...
[23:35:50] wagnerrp: ive got several laying around, doing a fresh distclean and build presently
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[23:39:28] jya: So right now we have the choice of lossless (both audio/video) ; stereo mp3 ; or stereo uncompressed
[23:40:10] jya: is that right? Beirdo you know this more than I do...
[23:40:55] Beirdo: I think so. My main use is the output in fifo mode, rather than in-job transcoding though
[23:41:24] Beirdo: actually, in fifo mode, it's X channels uncompressed
[23:41:29] jya: have you tried the "passthru" mode by any chance ?
[23:41:36] Beirdo: it will output PCM for each channel in the source
[23:41:47] Beirdo: nope
[23:42:04] jya: Beirdo: with the change I made, it's going to be stereo only...
[23:42:14] Beirdo: even in fifo mode?
[23:42:19] jya: actually, it would have been stereo only for quite a while.
[23:42:57] jya: multi-channel audio was broken in mythtranscode, because I was sending multi-channel audio from avfd, when mythtranscode always expected stereo
[23:43:07] Beirdo: well, last time I checked with nuvexport, I got 6 channels PCM. But you have been tinkering, so I may need to fix it again
[23:43:16] Beirdo: K, good to know
[23:43:39] jya: so all I added was make ffmpeg decode only the number of channels required: here stereo
[23:44:06] jya: so if you got 6 channels PCM ; it was just a side effect of that other problem
[23:44:44] Beirdo: K, that's cool, so ffmpeg will do the downmix on decode then
[23:44:47] jya: I started to send multichannels PCM all the time to prevent the volume issue when playing 5.1 AC3 on a stereo TV
[23:45:30] jya: that's right... But ffmpeg does a crappy job with AAC audio (you'll only get left/right channel) ; and the volume will be screwed up for AC3
[23:46:16] Beirdo: sounds like some bug fixes for upstream :)
[23:46:21] Beirdo: which one? dunno.
[23:47:02] jya: I thought I could add a call to the myth downmixer inside mythtranscode ; but the problem is that in mythtranscode there's no internal information as to how many channels we want in the end
[23:47:12] jya: the mp3 encoder only accepts stereo
[23:47:21] jya: the nuv one, same
[23:47:26] Beirdo: right
[23:47:48] Beirdo: so withough a massive rewrite (which I'm sure it's due for anyways), I guess stereo will do for the moment :)
[23:47:50] jya: but there's no variable stating: output_channels = 2, or 6 etc...
[23:48:23] jya: yeah, and I don't even know how the lossless transcoding works to be honnest...
[23:48:51] Beirdo: I think I get the basics, but never really looked carefully at this implementation
[23:49:03] jya: Beirdo: the issue in ffmpeg and the downmixer is an architectural one. Only the DTS and AC3 decoder support downmixing, because it's part of the codec
[23:49:30] Beirdo: basically, between I frames, you just copy, but if the cut isn't aligned with the I frame, you need to decode and regenerate the frames
[23:49:55] jya: there's no downmixer path in the codec decoding for other codec. So if you decode AAC and tells ffmpeg you want 2 channels: it gives you left/right only. It doesn't decode all channels to then downmix
[23:50:14] Beirdo: blech
[23:50:46] jya: the AAC decoder from libfaad used to do it.
[23:51:11] Beirdo: right
[23:51:42] jya: ok.. I'm going to try with some mpeg with 5.1 AC3 recording , and see if the lossless work and how difficult it would be to have mpeg4 video with original audio
[23:52:09] Beirdo: we need to get a repository of test recordings going
[23:52:13] jya: at least it works in stereo right now... (was me who broke it when I made myth do all the downmixing)
[23:52:33] Beirdo: I'm pretty sure we have a spot on the server, but no easy way to get to it yet
[23:52:37] jya: I have put a sample of a lot of files that presented problem at some stage..
[23:52:52] Beirdo: yah
[23:53:13] jya: http://www.avenard.org/files/media/mediatest/
[23:53:18] Beirdo: like... short recording with MHEG, short recording in blah format that only X country uses
[23:53:43] Beirdo: cool
[23:53:59] Beirdo: I'll have to dig through my samples and get renaming
[23:54:28] Beirdo: I mean, i can get all teh ATSC and HD-PVR samples I want, no problem
[23:54:30] Beirdo: and IVTV
[23:54:34] Beirdo: but past that...
[23:56:34] Beirdo: hmm, trying to remember what was left in the logging changes.. Ah yes, adding commandline options for syslog facility, and to disable the console logging
[23:56:37] Beirdo: that was it
[23:57:26] Beirdo: and to disable db logging
[23:57:58] Beirdo: that should give sphery time to get home and help me get the housekeeping thread to cull out old db logs
[23:58:02] jya: in transcode?
[23:58:11] Beirdo: no no, for all apps
[23:58:35] Beirdo: sorry, mentally switched gears there on ya

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