Decklink 10 bit workflow and mpeg2 question

[Peter Corbett]

Where you’ll see more than 10% difference (a lot more) is encoding very long programs 100mins to 120mins. That’s where the differences really kick in with fewer artifacts, less mosquito noise and sharper images.

Peter Corbett
Powerhouse Productions
Australia
http://www.php.com.au

[Pablo2099]

Do you mean for encoding using a lower VBR (say 6-7mbps)in order to fit onto a single 4.7gig DVD? Do you use the 4x multipass VBR with this? If so I could see where the investment would be justified if maximum quality is the focus (as it should be)

out of curiosity, what would your encode time be for a 120min 4pass VBR encode job?

Cheers

Pablo

[Bj Ahlen]

CinemaCraft’s strength is in encoding progressive footage (because that’s what film transfers are).

Procoder’s strength is in encoding interlaced footage (because that was their bread and butter).

Multipass helps more at low bit rates (relative to the amount of motion).

[Peter Corbett]

Hi Pablo,

I’d probably do around 5.7 average, with 8.0 max and 3.0 min. It varies, but with CC you can specify exactly the amount to fit on the disc and adjust the bit rate to fit. I also use Procoder all the time for everthing else – WMV9, QT, MP4, AVI, etc.

Peter Corbett
Powerhouse Productions
Australia
http://www.php.com.au

[Richard Scobie]

Pablo,

You may want to double check with the stations what MPEG profile they require the TVC in.

Here in NZ, the requirement is 15Mb/s MPEG2 422@ML, not MP@ML which is 4:2:0 and is commonly used for DVD etc.

Either way 10 bit not going to gain you anything, as both formats only encode to 8 bit.

If you do need 422@ML, CCE will not do it (not sure about Procoder).

Regards,

Richard

[Peter Corbett]

Yes it’s true that MPEG2 is 8-bit, but as I said above, the 10-bit will help with editing your master if you have graduations, big chroma/gamma shifts and blurs or even transcoding/dubbing. Compromised masters often lead to compromised dubs or exports. Commercials get compressed again from the 15mbs delivery version, and can look pretty shitty on some stations. Still we’ve got to try for the best, haven’t we? 😉

I send all my masters to Dubsat via 15mbs MP@ML. I’ll have to investigate 422@ML. I couldn’t see any options in Procoder.

Peter Corbett
Powerhouse Productions
Australia
http://www.php.com.au

[Richard Scobie]

[Peter Corbett] “I send all my masters to Dubsat via 15mbs MP@ML”

Interesting. I thought all Aussie delivery agents had the same requirement. Quoting from Adstream:

“The file formats we accept are:
MPEG files (.mpg or .mpeg):
MPEG2 4:2:2 (25 Mbps or higher)”

Here it is 422@ML or nothing.

The encoding options for 422@ML are limited and expensive. Telestream is one or Digital Rapids cards and software.

Regards,

Richard

[Igor Babic]

Try TmpgEnc2.5 Plus. This can transcode any avi to 422@ML 10bit and at max 2pass 80Mbps.

https://www.pegasys-inc.com/en/product/tp_spec.html
You can download trial. Excellent product. Has MPEG Editing function as a bonus.

Never use it at this rate, but for DVD picture is brilliant.

[Pablo2099]

TmpgEnc scares me though – Whist the visual quality is great, Ive heard a few say the audio is nowhere near as good. I might check it out though as Id luv to be able to go 25mbps instead of just 15.

The option I always use in Procoder is a storage MPEG which allows you to select a 422P@ML profile at 15mbps. I use adstream and whilst its true that 25mbps is their ‘stated’ requirement – Ive never had an issue sending them at 15.

Pablo

[Peter Corbett]

I might give it go with Procoder at 25mbs. I use Dubsat but do the rates compare with Adstream? I’ll have to check it out.

Peter Corbett
Powerhouse Productions
Australia
http://www.php.com.au