Need help calculating SCR in VOB/MPEG2 files

Derrow · 17th January 2002, 15:37

Does anybody know how the SCR (System Clock Reference) is calculated correctly in VOB files ?

It seems to be nearly the same as for MPEG2 program files, but I dont get around whit it.

All I know, the SCR is retrieved by the number of bytes transfered divided by the muxrate and multiplied by 27Mhz.

SCR= nr of bytes / muxrate(usually 1260000) * 27000000

If I compare that with a VOB file, the values I calculate does match only in the first VOB-Unit.
Mostly when an audio pack apears, the SCR makes a huge jump to a high value, and I didn't figure out yet how to get that value ?

I guess it must have something todo with the STD buffer size.

Can anybody help me?

17th January 2002, 15:37	#1 \| Link
Derrow Registered User Join Date: Nov 2001 Posts: 897	Need help calculating SCR in VOB/MPEG2 files Does anybody know how the SCR (System Clock Reference) is calculated correctly in VOB files ? It seems to be nearly the same as for MPEG2 program files, but I dont get around whit it. All I know, the SCR is retrieved by the number of bytes transfered divided by the muxrate and multiplied by 27Mhz. SCR= nr of bytes / muxrate(usually 1260000) * 27000000 If I compare that with a VOB file, the values I calculate does match only in the first VOB-Unit. Mostly when an audio pack apears, the SCR makes a huge jump to a high value, and I didn't figure out yet how to get that value ? I guess it must have something todo with the STD buffer size. Can anybody help me?

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