On Thu, 28 Oct 2004, Martin Samuelsson wrote:
On Thursday 28 October 2004 01:45, Steven M. Schultz wrote:The frames that I feed to mpeg2enc are actually not interlaced, they are ordinary 'progressive' images. But since I use png2yuv to generate an
Ok - that's what I figured. Now to interlace that you need to take the "top" field from frame #1 and the "bottom" field from frame #2!
It sounds like you're taking the two fields from the same frame - the top lines of frame #1 and the bottom lines of frame #1. That's not how interlacing needs to be done (if I'm not totally off base - and if I'm spouting off incorrectly someone will let me know I'm sure ;)).
No, you're right. Perhaps, or not. It all depends on one thing I'm not able to remember seeing in this conversation:
Dik, what are you generating? Your choices are these:
1: 50 full-resolution images per second. 2: 25 full-resolution images per second.
That would be number 2 in my case :)
In case 2, however, you've got to do the same thing people do when they convert wet film material into PAL: Take all odd-numbered lines of image 1 (I'm deliberately avoiding "frame" here, and in point 1.) and put them into the top field, then all even-numbered lines of, still, image 1, and put them into the bottom field. The purists seem to prefer not to call this an interlaced stream, as the fields in fact represents the same point in time.
This is exactly what I was trying to do. To be precise, I use this command to convert the images into a yuv stream:
ppmtoy4m -F 25000:1000 -I t -L
It's how all 24 fps movies are converted into PAL and then broadcasted, though.
3: Something completely different.
In case 3: What? :)
/Sam
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