video choppy when panning

[thecrock]

I recently burned an AVI file to dvd, the movie has a lot of camera panning in it and i noticed the playback is jittery when these scenes come onscreen. Wondering whether it may be due to conflicts from the codecs i have installed.

[manono]

Hi-

Wondering whether it may be due to conflicts from the codecs i have installed.

No. It's more likely to have been caused by the way it was encoded. We'll need more information, though, such as the encoder, the settings used, and the other steps you took between AVI and DVD.

I'm assuming you actually converted the AVI to DVD, rather than just burning the AVI onto a DVD-R

[thecrock]

The file was burned using Nero 6,the size is 1.42 gb, frame rate 23 fps and the video compression is XVID.

[manono]

Ah, OK; I thought you had converted it to DVD.

That can be caused by a number of things. A couple come to mind. Panning scenes require a lot of bitrate. Are you having trouble only after burning to DVD, or did you notice the same thing when playing from the hard drive? If you have a really weak computer, that could be one reason. Another might be that it shouldn't be 23.976fps. Maybe it should have been kept at 29.97fps and deinterlaced, or maybe it's a conversion from PAL, and should have been "IVTC'd" to 25fps.

You might try and open it in VDubMod and step through one of the problem scenes frame by frame, to see if it's actually missing frames, or if it's a playback issue that causes it to be jerky.

If you could upload one of the problem scenes somewhere, we could take a look at it.

[jggimi]

In http://forum.doom9.org/showthread.php?s=&threadid=93582 thecrock wrote:I recently burned an avi file to dvd using Nero....When i played back the disc on my dvd player...It's not clear, from what you've posted so far, thecrock, just where your problem is occurring. On the PC? On an MPEG-4/AVI capable standalone player?If the latter, your file may not be compliant; there are bitrate limits, among other codec settings that must be properly configured to play back MPEG-4 on standalone players.

With more information, we'd be able to give you appropriate advice.

[thecrock]

The file plays perfectly on my PC its only on my dvd player that i get a problem. My brother watched the movie with me and says i'm picking flies and the jerkiness is not all that noticeable but i like my movies prerfect. Anyway i will try vdubmod and let you now how i get on.
Thanks for the interest you guys it is much appreciated.

[manono]

Hi-

My brother watched the movie with me and says i'm picking flies and the jerkiness is not all that noticeable

Maybe he's not an encoder. We encoders tend to notice things that regular people don't, and as you said, we like things to be perfect.

But you're slowly giving us enough information, and I think that jggimi nailed it. DVD/MPEG-4 players have lower max bitrates than do computers. If it's OK on the computer, and only plays jerky on the standalone, you've most likely run up against its max bitrate, which for many is on the order of 4-5 Mbps. As I said before, during panning scenes the bitrate jumps. There are a couple of things you can do. One would be to use the settings in the latest versions of XviD which limit the max bitrate to ensure standalone compliancy. Another might be to use a lower resolution. Also, if you're capping the quants in your XviD settings, you might have to loosen them up again.

[thecrock]

Hi manono and jggimi

The file had already been encoded to XVID when I got my hands on it and being very new to this (about a week) I've never encoded into XVID myself, anyway manono says to try a lower resolution to solve the problem. I used 2 pass encoding for higher quality do you think I should just use 1 pass? I seem to remember reading somewhere that the sharpest picture can affect the smoothness of playback. Again thanks for helping me out guys.

[jggimi]

The file had already been encoded to XVID when I got my hands on it...

Then this may not be Fair Use of the content. Please review: Our definition of Fair Use. Its under Piracy and Copyright in www.doom9.org/disclaimer.htm.

This Announcement (http://forum.doom9.org/announcement.php?s=&forumid=6) that you may have missed.

Rule #6 (http://forum.doom9.org/forum-rules.htm) Thanks!

[thecrock]

You are right, my apologies.

[dli]

This is not necessarily a bitrate problem. Some standalones' firmwares especially those based on Mediatek chips exhibit problems of this kind on non DivX certification compliant XviD encodes. Use GSpot or MPEG4modifier to check whether the encode was done with more than 1 consecutive b-frame and packed bitstream was turned on. If so unpacking the bitstream may take care of the problem.

[ammck55]

dli-Please pull up and read the documents that jggimi gently steered thecrock in the direction of. Not only is it against Forum policy to post on XviD files that you have not personally created, giving help on such files is also against our rules.

Thread closed.