[vdr] error decompressing frame for Astra HD+

Reinhard Nissl rnissl at gmx.de
Sat May 10 11:54:48 CEST 2008


Hi,

Igor schrieb:

> I'm glad to see you :)

Well, I was quite busy at work this week.

> what about your VDR system ? Have you the same errors ?

Well, my P4 2.8 GHz HT system is not powerful enough to play this 
stream in real time. Hence, I regularly see VDR issue CLEARs 
after which such messages are normal.

> btw , I have uploaded one sample from AstraHD with the size 10 MB
> 
> Astra.pes  
> http://www.zshare.net/download/1179707004348a83/
> 
> you can try it

As written above, I had to slow down replaying:

	xine -S slow2 astra.pes#demux:mpeg_pes

This only gives me messages for two B pictures, i. e. you're cut 
VDR recording shows a picture structure like that:

	IBBP....

In MPEG2, one (VDR) would have set the broken link flag for such 
a group of pictures as the B pictures cannot be decoded without a 
reference picture from the previous GOP.

But H.264 doesn't have a broken link flag, so that's why FFmpeg 
gives messages like the following:

[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]no frame!
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]B picture before any references, skipping
[h264 @ 0xac236490]decode_slice_header error
[h264 @ 0xac236490]no frame!

Bye.
-- 
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl at gmx.de



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