| Friday, August 10th, 2012, 00:06 UTC | ||
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| [00:14:11] | jya: | danielk22: there's one thread doing the all downloads in HLS, so whatever clients/thread is reading from it, it doesn't really matter. joining the thread, whatever that means shouldn't have an impact on how long it takes. I wonder if this is related why changing channels in LiveTV takes so long, here with HLS it only makes it worse… |
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| [13:31:03] | danielk22: | jya: joining the thread is when you wait for a thread to finish up. i.e. calling pthread_join, MThread::wait(), etc. If there is one long lived thread for all downloadNow() calls then that is probably causing some issues because you can't start the download for channel X because the last segment of the download for channel Y needs another 15 seconds to finish. |
| [13:31:43] | jya: | danielk22: I'm changing the HLSRingBuffer destructor, so it goes through the list of everything currently downloading, and cancel the download |
| [13:32:40] | jya: | unfortunately, the MythDownloadManager code for cancelDownload (which is never used in mythtv) is broken as it delete an object used in the downloading thread.. cause segfault, so I've fixed that first. |
| [13:33:02] | danielk22: | heh |
| [13:33:03] | jya: | so now the destructor takes only about 3–4s all up |
| [13:33:11] | jya: | enough for the change of channels to work... |
| [13:33:25] | danielk22: | so it was taking more than 5–6 seconds before? |
| [13:33:29] | jya: | still have a few racing conditions occurring on MDM, going through them all |
| [13:34:13] | jya: | danielk22: yes, the destructor set a boolean for the HLS download thread to stop. But I'm using the DownloadURL command of MythDownloadManager. |
| [13:34:21] | jya: | this doesn't exit until the download is finish |
| [13:34:39] | jya: | for that particular stream, it takes 16s for the segment to complete download |
| [13:34:40] | danielk22: | jya: I wonder if the non-blocking MDM API would be easier to deal with in the long run. Then you wouldn't need to wait for the downloads to stop, just disconnect the listener after sending the cancel. |
| [13:35:12] | jya: | so that's how long the destructor take, the frontend would have timedout before that, so the backend after the channel change is successful, just close everything as there's no more client |
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| [13:36:11] | jya: | danielk22: I was thinking the same… but making all this code re-entrant with signals is a major headache/work |
| [13:37:35] | danielk22: | yep |
| [13:38:08] | jya: | right now, I prefer to fix the MDM::CancelDownload as that way I have little to change |
| [13:43:11] | jya: | though… it's such a pain to cancel downloads right now with the blocking API, that maybe I should just try to do the same with the non-blocking one |
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| [14:10:56] | jya: | danielk22: with my speed up of the HLSRingBuffer, I see often when changing channels: "DTVRec(1): FindH264Keyframes: No ringbuffer" |
| [14:11:05] | jya: | Is that something to worry about ? |
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| [15:20:49] | jya: | danielk22: okay, I've pushed my changes. I now have livetv channel change working well with HLS |
| [15:25:44] | danielk22: | w00t! :) |
| [15:33:18] | MythBuild: | build #3955 of master-linux-32bit is complete: Failure [4failed compile core] Build details are at http://code.mythtv.org/buildbot/builders/mast . . . /builds/3955 blamelist: Jean-Yves Avenard <jyavenard@mythtv.org > |
| [15:35:07] | jya: | damn... |
| [15:36:34] | jya: | ah shoot, have the code within a #ifdef LIBCRYPTO |
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| [15:52:46] | jya: | danielk22: did you read the post on the mailing list about myth not starting up at the right time following the UTC conversion? |
| [15:58:36] | danielk22: | no, I guess it is on the users mailing list? |
| [16:00:01] | MythBuild: | build #3956 of master-linux-32bit is complete: Success [3build successful] Build details are at http://code.mythtv.org/buildbot/builders/mast . . . /builds/3956 |
| [16:02:27] | jya: | danielk22: yep |
| [16:02:34] | jya: | let me find a link |
| [16:03:07] | jya: | http://www.mythtv.org/pipermail/mythtv-users/ . . . /338045.html |
| [16:04:44] | ** jya off to bed ** | |
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