Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.


Go Back   Doom9's Forum > Video Encoding > MPEG-4 AVC / H.264

Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
Old 7th January 2009, 03:46   #1  |  Link
Registered User
Join Date: May 2004
Posts: 4
Advice on MJP2-to-H.264 conversion?

I am using a slideshow authoring program called ProShow Gold. It can output a variety of video formats and containers. However, they all seem to be saddled with 4:2:2 or 4:2:0 chroma subsampling. The only exception is a Quicktime MOV with Motion-JPEG2000 compression.

My ultimate goal is to have these slideshows available to clients on my web site. My company logo incorporates some red on black, and as you can imagine the results are terribly blocky. The MJP2-encoded Quicktime looks good, but results in too large of a file and does not appear to be widely supported (e.g., in a Flash video player).

Here are two demonstration videos:

http://luxography.ca/tmp/subsampling_mjp2.mov (8744K)
http://luxography.ca/tmp/subsampling_h264.mov (4060K)

I would like H.264 video that looks as good as the MJP2 one. I've run into a major obstacle, namely finding one utility that can both read MJP2 in a Quicktime container, and encode to H.264 with 4:4:4 chroma subsampling.

My target playback size will be around 768x512. I've tried outputting an MPEG-4 at 1536x1024, then using a utility like Handbrake to scale down and re-encode with x264. But it appears that it defaults to at best 4:2:2, and the compression artifacts are reintroduced. I have also tried Quicktime 7.5.5 Pro's export features to no avail.

Subsampling aside, I have been getting excellent results with x264 on 1280x720 videos at less than 1 Mbps streaming.

I do not have access to any of the high-end video compression tools, and it seems I'm out of luck with the free/affordable alternatives.

Anyone have any further recommendations I can try?
- Brian
traycer is offline   Reply With Quote

4:4:4, chroma, mjp2, subsampling, x264

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +1. The time now is 03:48.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.