On Monday 09 May 2005 02:36, Chris Kennedy wrote:
> Ah, it is working now, but seems it will output garbled CC, repeat
> letters alot, and not output all the CC, comes in spurts kinda, very
> odd, I'm looking closer, but sounds like still a possible parsing issue,
> seems like there's alot of stuff with the first 2 bytes 0x80...
>
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 8080e576
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 808079f2
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 8080f420
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 808070ef
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 80807020
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 808064e5
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 808067e9
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 8080e5f2
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 808020e5
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 80807562
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 8080ecec
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 80808073
> May 8 19:36:13 digit kernel: saa7127: CC data 3: 8080f294
> May 8 19:36:14 digit kernel: saa7127: CC data 3: 8080a197
> May 8 19:36:14 digit kernel: saa7127: CC data 3: 808061e3
> May 8 19:36:14 digit kernel: saa7127: CC data 3: 80802094
> May 8 19:36:14 digit kernel: saa7127: CC data 3: 8080d094
> May 8 19:36:14 digit kernel: saa7127: CC data 3: 8080a297
> May 8 19:36:14 digit kernel: saa7127: CC data 3: 80806854
I believe that 8080 is the CC data of field 2 (XDS data). The actual closed
captioning is in field 1 (that's the lower 16 bits). I think that a
widescreen NTSC program will actually use the XDS data. Can you confirm that?
From what I remember all CC data is actually stored correctly in the stream,
i.e. no CC data is dropped. So my suspicion is that it all boils down to
timing problems with the output. First check that each VBI 'frame' is
obtained on time from the stream. I.e. that you don't get multiple VBI frames
in spurts instead of one frame per 1/30 second.
If that's OK, then it is a timing issue with programming the saa7127. Loop the
output of the PVR 350 to the input of another PVR and check if the XDS data
really ends up in field 2 and the CC data in field 1. I remember seeing
problems with that.
Hope this helps,
Hans
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