id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	mlocked
9176	Calculated current position deviates from actual position for H.264	stuartm	beirdo	"This is a recent bug, I guess either introduced somewhere in the last 6 weeks or caused by a change in the encoding of BBC HD.

After watching a recording for a period, the first seek made either through skip/jump or the editor is wildly wrong, most of the time several minutes later in the recording than it should be. Additionally the bookmark mark written to the database does not correspond to the actual location.

The symptoms initially suggest a bad seektable, such as the issue reported for #9126 so this may be a duplicate but the effects are different. I can seek around the recording with the editor and the byte offsets seem fine, the last frame in the table does seem to correspond to the end of the recording, the total recording length appears to be accurate unlike in #9126.


{{{
|  13940 | 2010-11-01 19:28:00 |    0 |      376 |    9 |
|  13940 | 2010-11-01 19:28:00 |   15 |   918192 |    9 |
|  13940 | 2010-11-01 19:28:00 |   35 |  1934144 |    9 |
|  13940 | 2010-11-01 19:28:00 |   51 |  2946712 |    9 |
|  13940 | 2010-11-01 19:28:00 |   64 |  3614864 |    9 |
|  13940 | 2010-11-01 19:28:00 |   73 |  4626304 |    9 |
|  13940 | 2010-11-01 19:28:00 |   82 |  5394848 |    9 |
|  13940 | 2010-11-01 19:28:00 |   91 |  6009796 |    9 |
|  13940 | 2010-11-01 19:28:00 |  100 |  6602560 |    9 |
|  13940 | 2010-11-01 19:28:00 |  109 |  7204348 |    9 |
|  13940 | 2010-11-01 19:28:00 |  118 |  7852572 |    9 |
|  13940 | 2010-11-01 19:28:00 |  126 |  8344192 |    9 |
|  13940 | 2010-11-01 19:28:00 |  137 |  8960268 |    9 |
|  13940 | 2010-11-01 19:28:00 |  146 |  9536300 |    9 |
|  13940 | 2010-11-01 19:28:00 |  155 | 10158016 |    9 |
|  13940 | 2010-11-01 19:28:00 |  164 | 10701336 |    9 |
|  13940 | 2010-11-01 19:28:00 |  173 | 11248416 |    9 |
|  13940 | 2010-11-01 19:28:00 |  181 | 11851332 |    9 |
|  13940 | 2010-11-01 19:28:00 |  190 | 12628712 |    9 |
|  13940 | 2010-11-01 19:28:00 |  199 | 13310776 |    9 |
}}}

The first 20 entries in the seektable show a variable frame distance, not a static one. The last mark in the table is 77263 with an offset of 6435781440. There are 5818 entries in total.

It's also possible that framesPlayed is bogus, not the seektable?"	defect	closed	major	0.24.1	MythTV - Video Playback	Master Head	medium	Duplicate			0