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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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