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[vdr] Re: [PATCH] (DVB-T) statmux fix vbr tagging for pic header



At 17:32 18/05/2003, you wrote:
Has anyone encountered problems after applying the patch?

For me everything works fine.
The patch itself doesn't make it worse, it certainly makes it better.
I've tested the driver without the patch and tuned to a channel which usually works with it (meaning it doesn't deadlock straigh away). After about an hour there was the same ARM crash with the buffer running full. It appears related and the patch doesn't cover it or it's a completely different deadlock situation.

My first thought then was it could be the PCR that is going out of sync after a while and eventually crashes things (then again it should only be non-lipsync) so I made sure every channel had the correct PCR PID set. Same result.

I've read through the Texas Instruments av711x documentation ( http://www.linuxdvb.tv/documentation/AV711x_3_1.pdf ) which states in section 11.2 that the decoder is "free running" i.e. not synced on tuning to a channel, then activates PCR, then looks for PTS. The whole process to sync can take around 3 minutes or so it says.

What I'm wondering at the moment is whether the deadlock can be reproduced with a specially crafted MPEG2 file or whether there is some kind of unpredicable crash. I don't yet comprehend things about av7110 debitypes in av7110.c. Has this to do with the typ of card or system (i.e MHz of processor) etc. so could it be that some people get deadlocks and others don't. Odd.

What was changed in the firmware to include timshifting on one card? Are the buffers smaller or in another part of the RAM or something?


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