PAL Audio

Bit Of Byte wrote on 8/14/2005, 9:22 PM
Hi Team!

I have an issue with PAL Audio..

The problem as been discussed in the Vegas-Video Forum (titled PAL Audio) but I guess should have been posted in this Forum...

Anyway here is a typical "Property" of one of my captured files...

Video: 00:01:14.840, 25.000 fps interlaced, 720x576x24, DV
Audio: 00:01:14.840, 32,000 Hz, 16 Bit, Stereo, Uncompressed

Why is my captured footage now showing 32 khz at 16 bit - and not 48khz when I am recording footage at 16 bit.

Bit

Comments

rraud wrote on 8/17/2005, 5:22 PM
It should make no difference as to the audio sampling rate whether PAL or NTSC.
Some cameras, like the "awful-sounding-in-any-mode", Cannon has a 4 track audio mode which uses the 32k sampling rate.

I don't know if this could be related to your problem.
newhope wrote on 8/28/2005, 1:46 AM
Yep it's the setting that was used on the camera when the recording was made.
Normal PAL audio is 48Khz 16bit.
I can switch my old Panasonic into 32Khz if I want to do four track overdubbing, which I don't, on tape. Whoever shot the video had their camera set up to record 32KHz so you have an effective audio bandwidth of 20Hz to 16Khz --- if the audio material isn't music you won't notice much difference as normal terrestrial TV (analogue) is band limited to 15KHz anyway.
farss wrote on 8/28/2005, 6:43 AM
Even if the audio on the tape is 16/48K VidCap can get it wrong and you'll endup with resampled audio at 16/32K. If you switch the camera into 12/32K that's a different issue.
How VidCap gets this worng is pretty simple. Many decks and cameras default to 32K when the tape is blank. Now if you get VidCap to start capturing at that point (or if you use Capture Tape) it latches onto that sample rate and doesn't change when it gets the 48K stream off the tape. I haven't noticed it doing much damage to the audio, it seems to sound OK once you render it back to 48K, obviously you've lost a bit of the top end though and it'll probably sound bad during capture as Vegas manages to send 32K audio to the sound card that thinks it's getting 48K.
This bug exists in V4,V5 and V6 and seems to occur with every Sony deck that I've tried. The only video capture program that seems to have this errant behaviour is Vegas!
Please Mr Sony, you know about this problem, fix it!
Bob.