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Careful about size
Authored by: cvk_b on Nov 02, '05 08:10:34AM

Use sizes divisible by 16 in MPEG4 to avoid screen flicker on iPod (keeping with 230,400 pixels tip).

720 x 304 - 2.35:1
624 x 336 - 1.85:1
624 x 352 - 16:9
512 x 384 - 4:3

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Careful about size
Authored by: sjonke on Nov 02, '05 09:26:40AM

Interesting, I'll have to try this. I have not been happy with the way higher-than-320x240 video looks on the iPod's display. In particular you get horizontal white lines during fast motion scenes. Will the divisible by 16 rule eliminate that? Currently I've been sticking to 320x240 because of this (which doesn't exhibit the problem), but of course that doesn't look great when played on a TV.

--- What?

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Careful about size
Authored by: cvk_b on Nov 02, '05 11:35:03AM

For 320x240 I use H.264 from a baseline compile of HB (found in HB forums).
For those of you who are still waiting for your iPod, the height does not have to be 240 for H.264. So don't waste bits encoding 'black space' into your files. 320 by anything less than 240 should work. Your widescreen will be presented correctly. I use avg bitrate of 400 but sometimes I will go back and redo the file if the until it gets closer to a bitrate of 768.

For > 320x240 I use MPEG4 from a main compile of HB (found everywhere) following:

230,400 max pixels rule w/16 rule:
720 x 304 (2.35:1)
624 x 336 (1.85:1)
624 x 352 (16:9)
512 x 384 (4:3)
2500 bitrate (I know, overkill)
29.97/30 fps

Always 2 pass for both formats.

On a dual G5 it takes less time to encode than watch.

Hope that helps.

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Motion Screen Flicker
Authored by: EdZeke on Dec 26, '05 08:44:06PM

I just got a 60GB iPod video for Christmas. Lucky me!

I seem to get 'screen flicker' on the iPod during scenes with motion on all of my mp4 videos no matter the size, bitrate, frame rate and whether it be interlaced or deinterlaced. The h264 videos look fine, however. I'm starting to think I might have a bum unit. I haven't had a chance to watch them on a TV yet.

Is everyone experiencing this?

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