| Tuesday, January 1st, 2013, 00:06 UTC | ||
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| [00:22:42] | Beirdo: | jpabq: new job? congrats |
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| [01:38:31] | neufeld: | So, I see a discussion about a ago regarding keyframes. I was updating my script at http://www.mythtv.org/wiki/Transcoding_Preserving_Captions for schema 1299, and got weirdness. If I skipped anywhere in the H.264 file, it landed on a non-keyframe (obvious from the way images ghost in until the next keyframe). That didn't happen before. The script runs mythcommflag --rebuild. When I reran that command on |
| [01:38:31] | neufeld: | recordings that I had transcoded earlier under 0.24, the jump behaviour broke the same way. So something in mythcommflag is logging non-keyframes in the recordedseek table. I can build a seek table by hand, using ffmpeg -vf showinfo, and inserting the keyframe data into recordedseek, and it works perfectly. Comparing the database values for the two modes, I see that the mythcommflag version of it has many more |
| [01:38:31] | neufeld: | records. It has all of the ffmpeg-labelled keyframes, but is records other positions that are not keyframes as well. A particular recording of interest has exactly 485 keyframes. When mythcommflag runs, it generates 3266 unique records for that recording. If anybody has suggestions for patches, I can try them out. I'll delve into it myself when I get time, but I don't have as much context, so it might take me a |
| [01:38:31] | neufeld: | while. |
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| [02:04:56] | neufeld: | OK, what I believe to be an incorrect declaration of a frame being a keyframe appears to follow in H264Parser::isKeySlice(). I have a non-keyframe of type SLICE_I_a (7). It's coming back and declaring this frame to be a keyframe. I'm out of my depth on this, though. What are SLICE_I, SLICE_SI, SLICE_I_a, and SLICE_SI_a, and why is SLICE_I_a getting granted keyframe status when the playback can't be started at |
| [02:04:56] | neufeld: | that offset in the file? |
| [02:04:58] | stichnot: | neufeld: You are right that mythcommflag's definition of a keyframe is different than the recorder's definition. Pretty soon I will try to get that fixed. |
| [02:13:21] | neufeld: | stichnot: OK. Let me know if there's anything I can do to help. In the mean time, I'll just script up a little code to build my seek tables from ffmpeg outputs. |
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| [02:20:18] | stichnot: | neufeld_AFK: thanks, I'll let you know. |
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| [14:27:22] | stichnot: | danielk22: http://code.mythtv.org/cgit/mythtv/commit/?id . . . 2fceb2dd7935 has some minor recorder changes that ought to be fine, but I'd appreciate if you could take a quick look. |
| [14:33:08] | stichnot: | gigem: When you get a chance, please have a look at http://code.mythtv.org/cgit/mythtv/commit/?id . . . 2fceb2dd7935 with respect to your variable framerate recordings. Legacy recordings should have the same weird position/duration/seeking behavior as before. Mythcommflag --rebuild should fix those. New recordings should look good. The most complete test would be... |
| [14:33:10] | stichnot: | ...for in-progress recordings, since it relies on realtime seektable updates from the recorder. |
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| [15:12:47] | danielk22: | stichnot: I don't see any problem with the dtvrecorder portion. I do wonder if using a ratio for the duration wouldn't be more accurate than a double, but I don't think it really matters for <3 hour long recordings. + ratio<> is a C++11 feature ;) |
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| [15:27:00] | stichnot: | danielk22: yeah, I realize the potential for cumulative FP error, but it's hard to imagine that reaching a 0.5s threshold for any recording that would fit on a hard drive :) |
| [15:43:31] | danielk22: | :) |
| [15:43:54] | danielk22: | BTW Happy New Year everyone! |
| [16:10:16] | danielk22: | Did we update the cppcheck version? It looks like there are a bunch of error,warning and performance level messages that weren't there before. |
| [16:13:14] | stuartm: | Happy New Year |
| [16:13:35] | stuartm: | danielk22: Beirdo updated it a couple of weeks ago |
| [16:14:59] | danielk22: | If anyone is looking for a good C++ multithreading book. I read "C++ Concurrency in Action" by Anthony Williams while on vacation and it covers threading in C++ from beginner concepts up to a intro on lock-less algorithms. + it is updated for C++11. |
| [16:15:49] | stuartm: | looks like it was the latest master at that time, stable release is 1.57 and we're using 1.58 Dev |
| [16:17:12] | danielk22: | Considering some of the things it is warning about in performance, like inefficient constructors, I think our code must be pretty darn clean. It might be entertaining to run it on some earlier releases. ;] |
| [16:17:17] | stuartm: | danielk22: interesting, will probably give that a look |
| [16:18:31] | stuartm: | danielk22: I watched TV, ate and drank too much and managed to fit in some fiction reading – didn't occur to me to do something productive with the holiday ;) |
| [16:20:19] | danielk22: | Hehe. In my new job I'll be writing a lot of python, so reading about C++11 threading was part of my entertainment program. |
| [16:21:16] | danielk22: | Reading that book 10 years ago would have saved me from a lot of the self-education in threading mistakes. Of course the book didn't exist then.. |
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| [17:19:02] | gigem: | stichnot: I will try to take a look. BTW, do your changes handle dts/pts discontinuities? I haven't been getting as many of those lately, but I still get some. |
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| [17:28:38] | stichnot: | gigem: the changes should make it completely ignore dts/pts altogether. |
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| [18:46:36] | stichnot: | wagnerrp: I know nothing about upnp, but would it be hard for the server to roughly apply a cutlist while delivering the content? |
| [18:46:41] | gigem: | stichnot: Okay. Do your changes have any impact on danielk22's recording quality check? That is where the discontinuities affect me. |
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| [19:08:03] | stichnot: | gigem: on the recorder side, it just creates new markup in the seektable that was never used before, so there should be no chance of affecting recording quality calculations. |
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| [19:22:24] | wagnerrp: | stichnot: talk to beirdo about that one |
| [19:22:33] | wagnerrp: | he was working on that issue a bit last year |
| [19:23:02] | wagnerrp: | basically, instead of giving the UPnP player a single file, you gave it a playlist of several video segments |
| [19:23:40] | wagnerrp: | there may also be some requirement of giving time-based content listings, rather than filesize-based ones |
| [19:23:40] | stichnot: | ok, that sounds like an extension of HLS then. |
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| [19:25:27] | stichnot: | Getting the cutlist-adjusted length should be easy, especially if the new seektable markup is present. |
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