MythLogBot@irc.freenode.net :: #mythtv

Daily chat history

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Wednesday, July 6th, 2011, 00:01 UTC
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[05:49:30] xris: any of you guys working on web-setup here/awake?
[06:01:57] wagnerrp: ive fiddled with it, i might be of assistance
[06:04:39] xris: was mostly just wondering what people would think about using something like a python-based framework, rather than the built-in C++ web framework
[06:05:12] xris: but maybe the C++ one is working out fine.
[06:05:37] wagnerrp: unless youve got a plan for working around the Gil, i would say no
[06:08:02] xris: GIL isn't an issue with most of the modern python webserver
[06:08:03] xris: s
[06:08:09] xris: gevent, twisted, paste, etc.
[06:08:24] xris: as long as we're not 2.4.. 2.5? I forget.
[06:08:30] xris: anyway, 2.6+ is safe
[06:08:44] wagnerrp: they run independent interpreters?
[06:09:09] xris: depends on the implementation
[06:09:21] xris: gevent is libevent-driven (like node.js)
[06:09:36] xris: twisted is some kind of special multiprocessing/threading
[06:09:53] xris: dunno about paste, but it's definitely multithreaded and GIL isn't an issue
[06:10:12] wagnerrp: the GIL is an issue with multithreading
[06:10:23] wagnerrp: unless each thread runs its own independent interpreter
[06:10:43] xris: http://nichol.as/benchmark-of-python-web-servers
[06:13:24] xris: I've been using gevent a bit at work for a very fast api server. but using that for mythtv would add the overhead of having to implement our own template language parsing layer (or at least integrate with an existing one)
[06:15:04] xris: anyway, a number of things (e.g. cherrypy) don't have GIL problems.
[06:16:21] xris: figured that having the option of using python would move some of the web overhead to a separate process (which would run on a slave machine if necessary), and make sure the python bindings are kept up to date.. unlike the php/perl ones.
[06:16:35] xris: and since there are a lot of standalone webservers, it doesn't have the apache problem that php does.
[06:16:41] xris: just throwing out ideas, though.
[06:16:55] xris: I still have a love-hate relationship with python...
[06:18:41] wagnerrp: i never realized how poorly performing twisted is
[06:20:39] xris: well, that whole thing suffers from benchmarkitis
[06:21:04] xris: but it does give some interesting data about how things perform in that specific setup
[06:21:44] xris: anyway, iirc the multiprocessing lib (which is almost a clean dropin for threading) alleviates the GIL problems
[06:22:02] xris: as does the libevent stuff used by gevent
[06:23:32] wagnerrp: i wouldnt be against a rewritten mythweb in python, but i think the setup should be embedded
[06:24:02] wagnerrp: in python, with its own server, that is
[06:24:21] xris: I've been pondering rethinking mythweb in python, but would really like to hear back from this webinos guy first...
[06:25:19] xris: but yeah, assuming you guys found a decent templating language for the built-in stuff, or are comfortable working with whatever is there.. I was mostly just throwing out ideas.
[06:25:38] wagnerrp: certainly the xml interface should be integrated, rather than proxying through a separate server
[06:26:16] xris: oh, yeah.. though something other than xml would be nice. but I guess cdev did some cool work with automagic soap goodness
[06:26:52] wagnerrp: the interface supports any form of serialization
[06:26:57] wagnerrp: currently you can use XML and JSON
[06:27:08] wagnerrp: but other methods can be written if desired
[06:27:47] xris: ah, cool. that got finished.
[06:28:10] xris: I apparently miss still miss some commit messages (or that got added before I had a reliable feed)
[06:29:01] wagnerrp: there was a fairly sizable thread in the -dev list
[06:30:10] wagnerrp: this was back in march, i think
[06:32:17] xris: could be. -dev and -users get filed into the same inbox for me. I only really read -developers
[06:32:52] wagnerrp: it was briefly mentioned there, referencing the large description made in -dev
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[07:24:54] xris: hmm, "in use by.. preview generation" really shouldn't block a delete
[07:26:00] wagnerrp: i think theres a ticket for that
[07:26:05] xris: heh
[07:26:20] wagnerrp: i mean, i recall someone mentioning that a while back
[07:26:39] xris: since preview gen is wonky at the moment, I just used mythweb
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[08:09:17] pat1: Hello, I submitted a bug some weeks ago regarding pausing during playback on a remote frontend. The problem is resolved, but I'm not sure what was the source of the resolution. I've updated the ticket accordingly.
[08:09:22] pat1: http://code.mythtv.org/trac/ticket/9794
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[14:19:25] davide: jya: are you around? i got a gt430 yesterday and decided to try 2x timestretch on hdpvr/mpeg4 recordings. my igp 9400 could do 2x on atsc/mpeg, but could only get to 1.6–1.8x on hdpvr recordings depending on nvidia driver version. anyway, the gt430 looks to have enough power on the video side, but i'm experiencing audio underruns every second or two. is there anything i can tweak or configure to get rid of the underruns? this is using the alsa
[14:19:26] davide: hdmi device on the gt430.
[14:56:28] dblain: xris: I'm not working directly on the Web Setup, so I don't have an opinion on what should be used other than a desire for it to be contained in mythbackend so it would always be available.
[14:57:49] dblain: As for the JSON support, I added it some time ago along with server side scripting to the embedded Html server (simple server side execution of javascript with syntax similar to php/asp)
[14:58:12] dblain: FYI: Server Side Scripting (https://github.com/MythTV/mythtv/commit/257558928)
[14:58:12] dblain: Framework API (https://github.com/MythTV/mythtv/commit/856b61b53)
[14:59:00] dblain: Unfortunately, I still haven't found the time to write up any documentation yet.
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[15:11:49] jya: davide: did you increase the default buffer size as suggested in the audio log ?
[15:12:22] jya: with hdmi, if using timestretch, it will usually use LPCM all the way
[15:12:38] jya: you need to make the audio buffer to over 1MB to be on the safe side
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[16:04:23] davide_: jya: no, i haven't done anything yet. i didn't have time last night to do any fiddling or investigate the logs beyond seeing the repeated underruns. all that's on tonight's menu.
[16:05:04] jya: if you look at the log, if the buffer is too small, it will show a message with the command you should run on how to increase the hardware buffer size
[16:09:51] davide_: your talking about the /proc/asound/.../prealloc stuff, right? I just saw that in the code.
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[16:19:18] jya: davide_: that's right...
[16:19:28] jya: the alsa default is 64kB
[16:19:45] jya: this is nowhere near enough for 6 or 8 channels LPCM
[16:21:54] davide_: is there any standard way to make the new value persistent? /proc/sound is outside the control of sysctl and alsactl only appears to save/restore mixer levels.
[16:26:38] Beirdo: at worst, you can always use rc.local
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[16:28:25] davide_: Beirdo: i know, but i try to use the existing frameworks for stuff like that whenever it already exists.
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[17:14:52] Beirdo: granted :)
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[20:08:32] Diverdude: How can i change the font of subtitles in myth tv? I want it to be larger text, default text can hardly be seen
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