[Daniel Low]

Compressing heavily compressed stuff is never a good idea but it’s unavoidable in your case so you have to make the best of it.
Sorenson doesn’t actually know what ‘scene changes’ are only that when the differences between frames is above a certain threshold it will add a keyframe. Adding confusion to this calculation is also the placement of I B & P frames in the source MPEG-2.
As for frame size and player size, I’m not sure where you are going wrong by the bottom line is that the player video window (excluding the timeline) should exactly match the encoded video frame size. You should not be getting any black bars if done correctly.
Scaling using the player will impact the quality and playback performance.

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

Try setting keyframes to every 150 – the nastiest bit of corruption appears at the very end of the clip everything else I saw was slight.

Try and avoid blue backgrounds on graphics!

And IMHO, never use the player to resize the frame – encode to the desired frame size.

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

[Andrew Saliga] “but Daniel, you wouldn’t recommend an H.264”

Not at such low datarates – it’s worth trying though.

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

[Brecht Wouters] “A client wants to have a video with a duration of 12 minutes resized to only 10Mb”

10 Megabits (Mb) or 10 MegaBytes (MB)?

With or without audio?

I’ll assume MB. The datarate limit is rather low for any text to be clear. You could try H.263 or MPEG-4 or even the sorenson 3 codec at a frame size of 160×120 at a rate of about 120kbits/s

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

I measured the window on the test page and it’s more like 508×380

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

What frame size are you using – it looks a bit odd to me?

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

Ok, sounds like there’s a problem in the transcode, probably with the way the fields are being processed. My best advise to you is NOT to use Quicktime Pro to do the transcoding. Do you have access to any other transocding software? compressor, episode or squeeze for example?

What OS do you use?

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

Thanks for posting that back – however it would be interesting to find a solution that didn’t require a deinterlace step.

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

That’s a very low data rate for stereo(?) AAC audio used with HD video content. Other than that, there’s very little information to determine what’s going wrong where.

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004

[Daniel Low]

I’d post this in the Premiere forum for the correct workflow but in answer to your questions:

1. DVCAM is DVCAM not Quicktime (as it’s tape) but it can be digitised or created or transcoded to using the Quicktime DV PAL Codec.

2. If the footage is 16:9 then your project should be 16:9 and so should the clips (1024×576) – when played back to DVCAM tape they’ll be 720×576 FH anamorphic

3. The clips are stereo which is 2 channels (left and right), that’s all they are saying.

__________________________________________________________________
Two years from now, spam will be solved. – Bill Gates, World Economic Forum 2004