| Thursday, December 15th, 2011, 00:00 UTC | ||
| [00:00:56] | dekarl is now known as dekarl_zZz | |
| [00:04:10] | dekarl_zZz: | hmmm, obviously the backend started spamming "PESPacket: Failed CRC check 0x0 != 0xffffffff for StreamID = 0x0" and others as soon as I filed the ticket ;) |
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| [01:21:26] | skd5aner: | stuartm: NY Times movie review API – http://developer.nytimes.com/docs/movie_reviews_api , rottentomatores.com – http://developer.rottentomatoes.com/docs/json/v10/Movie_Reviews , USA Today – http://developer.usatoday.com/docs/read/movie_reviews |
| [01:22:04] | skd5aner: | stuartm: I believe you could also use netflix's API to get community submitted ratings/reviews as well |
| [01:24:10] | dmz (dmz!~dmz@unaffiliated/dmz) has joined #mythtv | |
| [01:24:51] | dmz: | howdy y'all, quick question...if I was interested in seeing what it would take to get a mythfronend written for honeycomb (android) where would I start looking for details on requirements for frontend? |
| [01:25:23] | skd5aner: | dmz: like a full fledged port of mythfrontend for android? |
| [01:25:31] | dmz: | yes |
| [01:25:40] | dmz: | i'm tired of re-encoding to flash and using web interface :) |
| [01:25:47] | dmz: | i have a nice tablet it should "just work" |
| [01:25:50] | skd5aner: | you would be doing the porting? |
| [01:25:57] | dmz: | i'd be starting it |
| [01:26:21] | dmz: | that's the hardest thign, getting initial port started, then others start hacking their own versions |
| [01:26:26] | skd5aner: | I think it'd be a seriously difficult task |
| [01:26:32] | dmz: | why is that? |
| [01:27:10] | dmz: | there are pleanty of examples of code to view video on android, especially wiht nice co-processors |
| [01:27:22] | skd5aner: | well, honestly – I'm not a developer, so I probably shouldn't have spoke up – but I can only imagine that even if you were able to get it to even compile on an android tablet, would there even be enough power there to run the thing |
| [01:27:24] | dmz: | just need to make a client to browse the recordings and then start/receive stream |
| [01:27:34] | dmz: | it would have to be a complete port |
| [01:27:38] | dmz: | it can't be compiled for android |
| [01:27:49] | dmz: | and yes pleanty of power |
| [01:28:02] | dmz: | my tablet has dual core 1Ghz (overclocked to 1.57ghz) 1gig ram |
| [01:28:12] | dmz: | bigger than most of my current embedded mythfrontends |
| [01:28:17] | wagnerrp: | thats not much power at all |
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| [01:28:33] | wagnerrp: | fine for some light browsing and some simple UIs |
| [01:28:41] | wagnerrp: | but nothing in the world of video decoding |
| [01:28:52] | sphery: | you'd be better off with something like iamlindoro's app |
| [01:28:54] | dmz: | my frontends are all VIA boards, single processor, 1g ram |
| [01:29:12] | dmz: | it has an nvidia chip w/hw decoder |
| [01:29:23] | dmz: | same as via |
| [01:29:30] | skd5aner: | I would think it would be much simplier to take almost start from scratch than it would be to try and port mythfrontend to android |
| [01:29:32] | dmz: | it's all in the gpu anyway |
| [01:29:53] | wagnerrp: | VIA units have XvMC decoding, which has since been abandoned by MythTV because its antiquated and sucks |
| [01:29:56] | dmz: | thats kind of where i was heading |
| [01:30:05] | wagnerrp: | the Tegra systems are not yet supported, such support would have to be written |
| [01:30:15] | dmz: | yeah my via's got borked but i didn't want to replace so I made the mwork :) |
| [01:30:24] | dmz: | well gives me a project for 2012 :) |
| [01:30:34] | wagnerrp: | mythtv *should* compile on android, in theory |
| [01:30:44] | dmz: | i'll see if i can get an app to browse mythbackend, schedule/manage recordings, browse listings, etc |
| [01:30:49] | wagnerrp: | as long as you get the necessary prereqs, like qt, it will compile on the ARM architecture |
| [01:30:49] | skd5aner: | Well, I applaud the goal – just seems lofty and I wish you luck :D |
| [01:30:58] | dmz: | :) |
| [01:31:02] | sphery: | dmz: see http://vimeo.com/33007761 for an example of something that probably should be done for android |
| [01:31:03] | dmz: | i'm not going to compile it |
| [01:31:06] | dmz: | it'll have to be a full port |
| [01:31:15] | sphery: | (i.e. that one is on ios, but no one has done an equivalent for android) |
| [01:31:26] | iamlindoro: | port... you keep using that word... I don't think it means what you think it means |
| [01:31:33] | iamlindoro: | port doesn't mean "new app from scratch" |
| [01:32:00] | iamlindoro: | port means "app on new platform using code from app on other paltform" |
| [01:32:43] | dmz: | hmm the companion looks interesting |
| [01:32:51] | dmz: | yeah that's a good place to start |
| [01:33:03] | dmz: | porting code means converting code |
| [01:33:07] | dmz: | where necessary |
| [01:33:19] | dmz: | at least that's how i've approached porting code for 20+ years :) |
| [01:33:37] | dmz: | so mythbackend support http stream? |
| [01:33:39] | iamlindoro: | which is not what you're talking about doing-- you're talking about implementing a new application, from scratch |
| [01:33:41] | iamlindoro: | which is not a port |
| [01:33:54] | dmz: | well i'd port some functions, "borrowing" the best parts :) |
| [01:34:01] | dmz: | then write from scratch new ones |
| [01:34:04] | dmz: | but i like this myth companion |
| [01:34:05] | skd5aner: | replicate or dupliucate |
| [01:34:11] | dmz: | copy :) |
| [01:34:13] | wagnerrp: | thats not 'porting', thats duplicating behavior |
| [01:34:25] | dmz: | whatever, i'm motivated :) |
| [01:34:35] | skd5aner: | good – don't let us stand in your way :) |
| [01:35:55] | sphery: | dmz: the idea behind the companion app is that it's using the services API to retrieve data so that it's loosely coupled to internal mythtv code--meaning much more maintainable |
| [01:35:59] | ** dmz goes to lok at the http live stream transcode ** | |
| [01:36:08] | dmz: | yeah i like that |
| [01:36:22] | sphery: | rather than trying to duplicate a moving target (where mythfrontend code is changing all the time) |
| [01:36:27] | dmz: | not sure if http stream is best, seems like it would add a large overhead on backend too |
| [01:36:29] | skd5aner: | dmz: http://www.mythtv.org/wiki/Services_API |
| [01:37:01] | sphery: | well, you could stream the full-bitrate recording file--if your little pad can handle it |
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| [01:38:02] | dmz: | we'll find out, down side is it'll take me a few weeks just to get the structure in place |
| [01:40:39] | dmz: | i'll be back in a few months and let y'all know what happens |
| [01:40:46] | dmz: | thanks for the info, the api is a great place to start |
| [01:40:56] | skd5aner: | stuartm: might be something useful here too with a bit of UK slant :) – http://www.guardian.co.uk/open-platform |
| [01:41:25] | dmz: | is there a common way to discover backends/frontends? just scan local network for them or is there a broadcast it'll respond to? |
| [01:41:31] | skd5aner: | upnp |
| [01:41:43] | dmz: | easy enough, thanks |
| [01:41:56] | dmz: | dang standards! :) |
| [01:45:52] | wagnerrp: | dmz: note, if youre running your backend on one of those little VIA units, the live transcodings will not be an option |
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| [02:09:42] | dmz: | no i have multiple backends and all are multi-core, big boxes :) |
| [02:10:07] | dmz: | my desktop is 8 core, 16 G with 4x24" monitors :) frontends are all fanless via |
| [02:11:45] | wagnerrp: | but all SD analog recording? |
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| [04:54:47] | Password: | hi kids |
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| [08:28:58] | markk: | sphery: I think there may be a bit of a chicken and egg issue with your last commit. Updated this morning and restarted the backend – it threw out a ton of sql errors about inserting into logging. stopped and started with db logging disabled and it was then able to update the database. restarting as normal now works. |
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| [09:25:03] | Beirdo: | markk: so ya know... it would be nice to be able to reuse your VDPAU changes for the GPU commflagging. To do that, I'll need a way to hook in and get handed the VdpVideoSurface itself (and ideally be able to supply the surfaces to the decoder as the buffering is significantly different) |
| [09:25:33] | Beirdo: | not sure where you're heading currently with the changes, but maybe this will help guide us into a common direction :) |
| [09:26:16] | Beirdo: | I take the VdpVideoSurface and bind it to OpenGL, then copy it over in the GPU memory to an OpenCL bound image |
| [09:26:43] | Beirdo: | which is a different path from how you currently have it, I think |
| [09:27:52] | Beirdo: | I'm thinking of cleaning up my branch some and pushing it to github next week. Ideally, it would be nice to be able to use common code for all of that stuff rather than the somewhat custom code I have now. |
| [09:28:35] | Beirdo: | With it available to see (even incomplete) you'd be able to easily see how I have it hooked up, which might give you ideas, etc. |
| [09:29:03] | ** stuarta suspects that might be a good plan ** | |
| [09:29:35] | Beirdo: | I don't mind reworking my code to fit :) Especially if we can get code that fits all needs, etc. |
| [09:30:17] | Beirdo: | I'm taking pretty much all of next week off, so I should have time to get it massaged up a bit for others to see ;) |
| [09:35:51] | stuarta: | lucky you, i'm working every day that's not a weekend or holiday :( |
| [09:36:21] | Beirdo: | heh, I had to burn off 48h of vacation this month ;) |
| [09:36:27] | Beirdo: | most of that's next week |
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| [09:56:15] | markk: | Beirdo: as you say, the easiest thing to do is to share your code. it's hard to see the synergies without understanding how you've handled it. I do have a plan for 0.26 to move VDPAU over to OpenGL – i.e. VDPAU for decoding only and then OpenGL for rendering – but that will depend on performance and the ability to use existing VDPAU functionality (e.g. hq scaling) without too much of a fudge. |
| [09:56:45] | Beirdo: | right |
| [09:57:28] | Beirdo: | :) Yeah, makes sense. It's nearly impossible at the moment for you to see into my code, so I realize it's less than ideal :) |
| [09:58:08] | Beirdo: | I like the idea of doing VDPAU->OpenGL like that, it seems to work pretty well |
| [09:58:51] | Beirdo: | I'm not doing it at the Presentation level though, just Video Surface, so I'm not sure how well it works further down the chain |
| [09:58:59] | Beirdo: | I'd suspect it will work well still |
| [10:02:55] | Beirdo: | I was unhappy to find that I had to copy the texture in OpenGL, but such is life. Can't bind the texture to both VDPAU and OpenCL simultaneously. :( |
| [10:03:25] | Beirdo: | but copying in GPU memory is blistering fast anyways |
| [10:04:31] | markk: | Beirdo: It probably doesn't even do a copy |
| [10:13:44] | Beirdo: | not in the normal binding, no |
| [10:14:04] | Beirdo: | but to get it bound to OpenCL, I needed to do a texture-to-texture copy in OpenGL |
| [10:14:27] | Beirdo: | otherwise the original buffer wasn't there anymore when I unbind VDPAU |
| [10:14:35] | Beirdo: | I got blank frames :) |
| [10:15:13] | Beirdo: | so instead, I have two OpenGL textures, one bound to VDPAU, one to OpenCL, copy across, then unbind VDPAU one, and carry on |
| [10:15:31] | Beirdo: | but in GPU memory, rather than system RAM |
| [10:16:16] | Beirdo: | ugh! 2am?! |
| [10:16:28] | Beirdo: | OK, I'd better go to bed. I just keep doing this :) |
| [10:47:16] | markk: | iamlindoro, Captain_Murdoch: a little more trial and error testing on libx264 settings. the single biggest improvement is generated by changing rc_lookahead to e.g. 10. transcoded material is clear from the very beginning. unfortunately on the test clip, setting rc_lookahead to anything other than 0 drops the frame rate from around 90 to 60 fps – but I guess that's the price of quality:) |
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| [13:01:59] | stuartm: | skd5aner: UK slant would be good for UK users, there are differing cultural attitudes to film content :) |
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| [14:05:55] | Beirdo: | oh how I love being on call |
| [14:19:49] | danielk22: | markk: Qt 4.8.0 supports threaded OpenGL.. probably a boon for performance, but I can imagine might complicate the OpenGL video renderer.. |
| [14:21:35] | Beirdo: | OK, server's fixed, time to try salvage what's left of my sleep. |
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| [14:30:33] | Captain_Murdoch: | markk, not sure if there are other ramifications, but I think that setting rc_lookahead also means that frames get buffered in the encoder, so there will have to be some logic added to keep track of the pts and keyframe status of those frames so that we can record the right pts to the output file and split on the right frame. also may mean buffering audio frames so the audio frames are in the same file as the video, but I think |
| [14:30:34] | Captain_Murdoch: | I already have code that can handle that. previously mythtranscode would write out audio whenever it had data, now it tries to keep the audio packets as close to the video packets as possible by checking audio frame pts >= last video frame pts before writing an audio frame. |
| [14:31:22] | j-rod|afk is now known as j-rod | |
| [14:31:24] | Captain_Murdoch: | so I'd venture so say that if your using a lookahead of 10, your A/V could be out of sync by 1/3 or 1/6 of a second. |
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| [15:03:46] | markk: | danielk22: I don't honestly see much advantage to threaded opengl – texture upload from a different thread might be useful though (upload video frames to gpu directly from decoder thread). |
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| [15:15:05] | markk: | Captain_Murdoch: that makes sense – though I might just have a quick test and see what rc_lookahead = 2 (for example) looks like. if it produces the correct results it might without the av sync... |
| [15:20:04] | markk: | Captain_Murdoch: interestingly rc_lookahead=1 is enough |
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| [17:45:57] | Captain_Murdoch: | markk, nice. I still have to handle the buffered frame situation though so I can track of the pts and keyframe status so I can split the stream at the right point for HLS. for non-HLS libx264 encoding it is good to know. once the kinks are worked out, converting from .nuv software recording and transcoding should be a lot easier. we could allow .mp4 w/ libx264 & mp3 or .mpg mpeg-ts with mpeg2video & mp3 |
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| [18:23:40] | sphery: | markk: oops, yeah, sorry about the log spew. I forgot to update the check, so it logs some db errors until the upgrade completes (it will recover on its own once the table is updated, but could slow things down depending on how many errors it's logging). I'll fix the check. |
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