| Wednesday, September 24th, 2014, 00:08 UTC | ||
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| [08:32:22] | paul-h: | stuartm: just updated my BE and LiveTV is working again – thanks for the fix |
| [08:34:31] | paul-h: | just ripping a CD. It's not finished yet but it seems to be working as expected so far |
| [08:48:34] | paul-h: | stuartm: rip completed without problems, all tracks on the master BE in the correct music directory, the FE updated it's track list OK and all tracks playing OK |
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| [08:52:25] | paul-h: | That was with a remote FE and separate master BE |
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| [08:54:32] | paul-h: | You have me wondering now whether I tested ripping on a combined FE/BE |
| [08:56:47] | paul-h: | Not something I can easily test since the location of be BE means I would have to be a contortionist just to open the CD drive |
| [08:57:42] | stuartm: | paul-h: that's alright, I'll look into it |
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| [11:09:30] | stuartm: | has anyone seen audio bitrates under 1Kbps in the wild? |
| [11:30:21] | dekarl: | no, even speex begins with >2kbps http://www.speex.org/comparison/ speex-devel is also the place I'd ask such a question. |
| [11:56:47] | stuartm: | that's good enough for me, certainly never going to see anything lower than that in video then :) |
| [11:57:39] | stuartm: | just prepping some schema changes and was debating whether we stored bitrates in kbps or bytes per second |
| [11:57:49] | stuartm: | seems like kbps will do |
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| [12:26:41] | dekarl: | stuartm, is that kilobytes or kilobits per second? I'm talking about "nothing below 2 kilobits/s" ;) |
| [12:27:03] | dekarl: | so kbps should be "good enough" |
| [12:27:35] | stuartm: | bits per second – thinko/typo |
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| [12:48:07] | stuartm: | stichnot: https://forum.mythtv.org/viewtopic.php?f=36&t=379 |
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| [13:09:11] | stichnot: | stuartm: thanks, I don't look at the forum that often (btw, any hope for an email gateway?). Sounds likely to be a recorder issue, but I'll try to triage. |
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| [13:28:44] | dekarl: | stuartm, so mythtranscode segfaults for you too? |
| [13:29:01] | dekarl: | was about to answer with the obligatory "show us your backtrace" |
| [13:29:57] | dekarl: | also dropping dsmcc on the floor should work, while support for (audio) streams coming/going is known broken |
| [13:30:54] | stuartm: | dekarl: it's not segfaulting, but it's not working either |
| [13:33:23] | stuartm: | oh, it is actually segfaulting |
| [13:33:41] | stuartm: | wonder why that wasn't logged by the kernel |
| [13:34:32] | dekarl: | still need to look into the "off by one frame" patch on the ticket and the "sometimes off by one frame" patch from lvr (which I can't find right now) before I start actually using mythtranscode again :/ |
| [13:35:15] | stuartm: | http://pastebin.com/1bwMfNz8 |
| [13:35:20] | stuartm: | backtrace ^^ |
| [13:35:26] | stuartm: | it is in libav |
| [13:35:54] | stuartm: | jya: ^^ lossless mpeg-2 transcoding is segfaulting since the last ffmpeg resync – http://pastebin.com/1bwMfNz8 |
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| [13:40:50] | dekarl: | jya/stuartm: looks like might have changed something https://code.mythtv.org/cgit/mythtv/commit/my . . . 57b9600b01d8 |
| [13:42:56] | stuartm: | dekarl: seems so |
| [13:45:05] | stuartm: | #12213 |
| [13:45:05] | ** MythLogBot http://code.mythtv.org/trac/ticket/12213 ** | |
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| [18:26:14] | stuartm: | dekarl: fwiw I'm finding no mention of a PS mode for Firewire either in the code or on the wiki |
| [19:08:59] | dekarl: | stuartm, hmm http://www.mythtv.org/wiki/Video_capture_card . . . ncoder_Cards |
| [19:09:14] | dekarl: | "compresses the tuned video signal into an RTjpeg, MPEG-2, or MPEG-4 program stream before sending it into the computer" |
| [19:09:24] | dekarl: | looks like i remembered it wrong |
| [19:10:24] | dekarl: | the firewire stream thing I remebered appears top have been the mpeg-ts with PAT/PMT |
| [19:10:41] | dekarl: | s/with/without/ |
| [19:13:46] | stuartm: | some of the hardware encoder cards do output PS stream it appears, just looking at where best to distinguish whether we're dealing with a PS or TS stream |
| [19:17:13] | dekarl: | re the migration path I like the idea of a batch scanner that renegerates missing / lost information |
| [19:22:12] | stuartm: | I'm not even sure where codec information is in PES packets (if it's there at all) |
| [19:24:30] | stuartm: | the fact that half the relevant standards are behing pay walls just makes this learning process slower :) |
| [19:32:57] | dekarl: | soon countries will be sued for publishing patents in the clear, because TTIP&co. crap :( I bet they'll find some obscure country where they don't have to |
| [19:33:29] | dekarl: | otoh "in the clear" lol, I tried to read some patents, clear is a large word for patent lingo |
| [19:35:19] | stuartm: | wait, what? |
| [19:35:20] | dekarl: | stuartm, looks like its a function of the recording profile? https://code.mythtv.org/cgit/mythtv/tree/myth . . . der.cpp#n330 |
| [19:35:36] | dekarl: | https://code.mythtv.org/cgit/mythtv/tree/myth . . . rder.cpp#n67 |
| [19:36:36] | dekarl: | https://code.mythtv.org/cgit/mythtv/tree/myth . . . der.cpp#n612 |
| [19:37:54] | dekarl: | unless its a hdpvr (would have been to easy) |
| [19:38:46] | stuartm: | dekarl: seen that already, but I was musing whether there was a point lower down in DTVRecorder where we'd be able to distinguish the difference as that would catch all future recorders too |
| [19:39:45] | stuartm: | or existing recorders which might produce PS streams but we're not aware of |
| [19:40:48] | stuartm: | although I've been sidetracked for the moment by the question of codec identification for PS streams |
| [19:41:10] | dekarl: | PESStreamID? |
| [19:42:03] | dekarl: | the only reference to FindPSKeyFrames is in mpegrecoder.cpp, so I'm not sure if there is a generic place to hook into |
| [19:45:43] | stuartm: | best I can tell the PES stream ID only determines whether it's video, audio, DSMCC, private data etc – although it hints that it might also indicate codec – there are a range of IDs reserved for both audio and video, I can't actually find a list of whether they correspond to specific codecs |
| [19:47:21] | stuartm: | the other, more likely possibility at this stage is that it's just for multiple video/audio streams not for indicating a stream codec |
| [19:48:41] | dekarl: | hmm, where is the non-pes streamid used? https://code.mythtv.org/doxygen/classStreamID.html |
| [19:49:03] | dekarl: | doh PMT/SDT or so |
| [19:49:56] | dekarl: | but then, just look at the recording profile? |
| [19:52:09] | dekarl: | would have been to easy, lots of "if !hdpvr" |
| [19:53:23] | dekarl: | the generic hack appears to be "hook into the three keyframe finders" |
| [19:54:45] | dekarl: | but that's missing the PS codec :/ |
| [19:56:09] | dekarl: | lets turn it around, can't the preview generator just read it from the ffmpeg structs? |
| [19:56:52] | dekarl: | I was wondering anyway if we can't kick of the preview generator when recording to seed the preview cache instead of waiting for a poor user to open mythweb after being away for two weeks :) |
| [19:57:16] | stuartm: | there's the Program Stream Map and Program Stream Directory, which contain stream_type – it's not clear whether these are available for PS containers though |
| [19:58:06] | stuartm: | dekarl: we already run the preview generator after recording, but we don't produce scaled copies for mythweb as we've no idea what size it's going to ask for |
| [19:58:47] | stuartm: | dekarl: we need to know the codec info from the moment we start recording if we're going to allow streaming of livetv |
| [19:59:27] | dekarl: | no chance of ripping out livetv, is there? |
| [19:59:29] | stuartm: | the more generic the solution the better |
| [19:59:29] | dekarl: | ;) |
| [19:59:50] | stuartm: | dekarl: well even streaming of in-progress recordings ;) |
| [20:00:30] | dekarl: | ahh, for streaming in progress recordings the preview generator could be good enough. for livetv it sure isn't |
| [20:00:48] | stuartm: | I'll figure it out, just an unwanted distraction from the stuff I'd rather be doing |
| [20:01:48] | stuartm: | I am learning some things about MPEG TS/PS which I didn't previously know, and that may come in useful in the future |
| [20:02:22] | dekarl: | For the hardware encoders we could taste the incoming stream once and store the result in the recording profile. |
| [20:02:39] | dekarl: | like, taste it the first time after the backend comes up |
| [20:09:06] | stuartm: | I need to find a more recent version of the MPEG TS/PS spec, this one is so old that it pre-dates the introduction of H.264, AC3, AAC and other codecs so it's not going to list the relevant IDs even if I determine which table contains the info |
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| [20:14:34] | stuartm: | if anyone has a copy of ISO 13818–1 from the last 5 years, preferably the latest from 2013, I'd appreciate a copy – smorgan@mythtv.org |
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| [20:21:50] | stuartm: | heh, dunno why I didn't think to look at the ffmpeg mpeg parser earlier |
| [20:26:01] | stuartm: | program stream map is present in PS streams, and contains the codec info, just need to parse that out when recording |
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| [23:03:11] | jya: | stuartm: I don’t believe it’s the resync that causes to crash. it caused a crash in 0.27 too that I had to reverse |
| [23:03:38] | jya: | problem is that the method we used to use for allocating the packet do not exist anymore, and the new “official” way crashes |
| [23:03:52] | jya: | i can’t explain why… i checked and rechecked a dozen time, the code is sound |
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| [23:44:51] | jst (jst!~quassel@198.199.94.175) has quit (Remote host closed the connection) | |
| [23:45:00] | jst (jst!~quassel@198.199.94.175) has joined #mythtv | |
| [23:49:47] | stichnot (stichnot!~stichnot@207.198.105.20) has joined #mythtv | |
| [23:49:47] | stichnot (stichnot!~stichnot@mythtv/developer/stichnot) has joined #mythtv | |
| [23:49:47] | stichnot (stichnot!~stichnot@207.198.105.20) has quit (Changing host) | |
| [23:54:31] | jst (jst!~quassel@198.199.94.175) has quit (Remote host closed the connection) | |
| [23:54:48] | jst (jst!~quassel@198.199.94.175) has joined #mythtv | |
| [23:56:18] | jst (jst!~quassel@198.199.94.175) has quit (Remote host closed the connection) | |
| [23:57:25] | GreyFoxx (GreyFoxx!~greg@out.of.phaze.org) has quit (Ping timeout: 260 seconds) | |
| [23:58:14] | GreyFoxx (GreyFoxx!~greg@out.of.phaze.org) has joined #mythtv | |
IRC Logs collected by
BeirdoBot.
Please use the above link to report any bugs.