[HTML inside] MPEG Stream questions...

[Roger Merchberger]

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--- alunjuk wrote:
> Display stream says this
> 80 80 0E 05 00 00 00 00 00 00 00 00 00 00 00 00 > (0x05) | 
> 80 80 0E 05 00 00 00 00 00 00 00 00 00 00 00 00 > (0x05)| 
> 00 05 47 E0 30 20 56 40 00 00 00 00 00 00 00 00 size=00054> (vid-
> H) | 00 00 00 00 00 01 B3 22 02 40 23 0E 29 23 81 10 11 11 12 
> 00 00 42 E0 30 00 CC 58 00 00 00 00 00 00 00 00 size=00004 
> (video) | 82 00 01 00 00 00 00 00 00 01 B8 00 00 00 00 00 00 01
[snippage]
And a log listing from my zss version 0.55 shows this:
#5# /30072/ \4\ .864. ,864, VV^0 0 0 0^AAA^0 0 0 1^V^f8 7a 78 0^^0 0 0 0^V^0 0 0 0^v0 0 1 b8 0 0 27 80v^0 0 0 1^V^0 0 0 0^^0 0 0 1^V^f a0 0 0^^0 0 0 0^V^49 80 0 0^^0 0 0 0^V^f4 c9 4c 0^^0 0 0 0^VV
#6# /52756/ \4\ .864. ,864, V^27 d2 a5 0^^0 0 0 0^V^0 0 0 0^v0 0 1 b8 0 0 2a 80vAAAAAA^0 0 0 1^V^90 ac 0 0^^0 0 0 0^VVAAAVV^d5 f8 0 0^^0 0 0 0^V^4b 80 0 0^^0 0 0 0^V
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The dark green 8-byte headers are GOP headers... but usually right after that there are 4-byte headers of 0 0 0 0 or 0 0 0 1; but sometimes there's wildly different data in these headers... is it possible that the tivo isn't breaking the video/audio stream on MPEG headers [but magically reassembles the stream correctly whilst playing] or is there a whole lot more to the MPEG standard than what I've found so far that allows data headers to be something other than 0 0 1 xx...?
There just seems to be a lot of these "strange" [well, at least to me] 4-byte headers that don't make much sense to me (yet).
Remember all, I'm still a newbie at this MPEG stuff...
... And I'm already working on zss 0.56 that will begin logging (for eventual chopping) on GOP header boundries, not on chunk/record boundries...
Sorry for the HTML but I cut-n-pasted from my zss log (which can now output in HTML, which does make reading the log quite a bit easier)... I hope it didn't look too evil.
Laterz,
Roger "Merch" Merchberger



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