Problem w/ Sorenson 4.2 to FLV

jlafferty wrote on 12/12/2005, 6:35 AM
Hiya,

Anyone else have this issue: I'm going from DV to Flash using the On2 encoder. I'm trying to get the frame dimensions to be set to 360x240 (half DV) only the program will not allow it. There's an option for 320x240, and there's also a checkbox for "Maintain Aspect Ratio". If I uncheck that box, then I can put 360x240 in -- with the box checked, it defaults to 360x270.

Here's the real annoyance -- with the box unchecked, and 360x240 manually entered (this is for a 512kb stream), my video instead gets re-sized down to something like 160x120!

And these On2 encodes aren't exactly a trivial render time :(

What say yee?

- jim

Comments

John_Cline wrote on 12/12/2005, 7:02 AM
DV video is 720x480, which is an aspect ratio of 1.5:1, but DV uses rectangular pixels and, when viewed on a television, it displays it at a 1.333: aspect ratio. Computer monitors are based on square pixels and you actually do want your DV-sourced video encoded at the correct 1.333:1 ratio. Therefore, use 320x240, not 360x240.

I do a smart deinterlace on my video and use 512x384 for On2 FLV. It looks really good at broadband speeds.

John
jlafferty wrote on 12/12/2005, 7:11 AM
OK. I "understand" the square vs. rectangle pixel argument, as it looks on paper. However, 320x240 encodes of my DV material look noticably stretched vertically. Why is that?
jlafferty wrote on 12/12/2005, 7:40 AM
Is this, BTW, possibly just my eyes playing tricks, or ? When WMP displays a 720x480 DV stream, it looks more rectangular than the 320x240 video... at least, to my eyes.
logiquem wrote on 12/12/2005, 7:43 AM
Crop 8 pixels each side of your original DV before resizing to 320 x 240.

704 x 480 (with NTSC 0,9091 pixels ratio) resized to 320 x 240 (square ratio) will preserve the NTSC original aspect when viewed on a computer display aspect.
jlafferty wrote on 12/12/2005, 8:07 AM
What should I used to do that cropping? Should I just re-encode to AVI from in Vegas and use Pan/Crop, then bring it into Sorenson and set it to 320x240, or do the cropping in Sorenson?
logiquem wrote on 12/12/2005, 11:30 AM
Crop in Sorenson.
jlafferty wrote on 12/12/2005, 11:03 PM
Alright, thanks!