[mythtv] MPEG4 and seektables
david.asher at caviumnetworks.com
Fri Mar 17 16:57:36 UTC 2006
I started using Steve Adeff's tv.com script (thanks Steve!) to load some
videos into the MythTV database.
The are MPEG4 .avi's. They play fine, but seeking is terrible. I kinda
expected that since there was no seek table.
So, I thought: "lets create a seek table for them". I tried:
$ mythcommflag --rebuild -f <avifile>
This acted like it was working, but the resulting seek table is horribly
I get all sorts of blocky artifacts (BIG blocks), and when first
entering the playback after saving position on exit I get a black screen
which slowly fills in -- sounds like we didn't start on a keyframe?
On starting playback I see (-v playback):
2006-03-16 22:51:40.079 Resyncing position map. posmapStarted = 0
2006-03-16 22:51:40.096 Position map filled from DB to: 59546
2006-03-16 22:51:40.096 SyncPositionMap prerecorded, from DB: 769 entries
2006-03-16 22:51:40.096 SyncPositionMap, new totframes: 59546, new
length: 2483, posMap size: 769
2006-03-16 22:51:40.096 AFD: Position map found
on FF I get:
[mpeg4 @ 0x1191a84]warning: first frame is no keyframe
So, I'm thinking the key frames weren't correctly found.
I've got 2 questions:
1. should i expect seek table generation to work for an MPEG4 ?
2. what is the difference between the --video and --rebuild -f options
for creating the seek table?
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