Intermittent Jerky Playback Question

[Maikeru-sama]

Jerky Playback Question

Hi Forum, I just had a question about a video that I have converted from AVI to MPV using CCE. It seems like the video has intermittent jerky playback about every 5-7 seconds. I have changed specific settings in CCE (which I will discuss later) and pretty much got the same result.

My CCE Settings are based on the guide below:
https://forum.videohelp.com/viewtopic.php?t=222898

The first time I converted my file:
Output top field first Stream was CHECKED
Offsetline was ZERO

The second time I converted my file:
Output top field first stream was NOT CHECKED
Offset line was ZERO

The third time I converted my file:
Output top field first stream was CHECKED
Offset line was ONE

Each time I got pretty much the same result, which is an intermittent jerky file. Is there any other settings in CCE that I could manipulate to fix the problem.

Note:I looked at the original AVI file and there doesn't appear to be any jerky play in it, so I know the problem is occurring during the conversion process.

Also, here is some file information from GSpot:
Container:
File Length Correct
DivX Style "packed bitstream" AVI
AVI v1.0
Interleave: 1 vid frame (42 ms), preload=504
Audio frames: Aligned on interleaves
Video: 197 MB (88.43%)
Audio: 23.5 MB (10.53%)
AVI Overhead: 2.32 MB (1.04%)

CODEC
DX50
Name DivX 5.0.3

[aedipuss]

not enough info on source and dest. but a guess is that you are trying to go from 25fps avi to ntsc mpg. the jerkiness is from the extra frames that are inserted to make up the difference. not much you can do about it other than trying to get a hold of the source in ntsc.

[Maikeru-sama]

Thanks for the reply. No, I am not doing a Framerate conversion. The source and destination is 23.976 FPS and in CCE, I have 23.976 chosen and doing a 2:3 Pulldown.

- Mike G.

[Chris K]

Thanks for the reply. No, I am not doing a Framerate conversion. The source and destination is 23.976 FPS and in CCE, I have 23.976 chosen and doing a 2:3 Pulldown.

What happens if you leave the 2:3 Pulldown off?
IMO both source and destination 23.976 don't need pulldown.

Chris.

[guns1inger]

If the target is for DVD then you do need pulldown for authoring. My experience is that CCE does a pretty good job with pulldown, however if you aren't sure then encode without it, and use DGPulldown to add it afterwards.

I also never (ever) load a raw avi file into CCE. I always load via an avisynth script. I never let CCE resize for me or do any processing other than encoding.

[Maikeru-sama]

Thanks for responding fellas.

Yes, this video was converted to MPV and placed on a DVD, so I have to use a pulldown or TmpGenc will complain. Also, I failed to mention, yes I always use AviSynth Script. Just for grins, I will provide the script, but I have used this script for thousands of conversion and never had this problem. Also, before anyway says anything, I know burning the sub into the movie degrades the quality but I have done it alot of times and I know it doesn't cause jerkiness. Also, the border is big because I want it to be widescreen.

LoadPlugin("C:\Program Files\DirectVobSub\VSFilter.dll")
AVISource("C:\movie.avi")
LanczosResize(656,336)
AddBorders(32,72,32,72)
TextSub("C:\movie.srt")
ConvertToYUY2()

I am going to re-encode without pulldown (maybe this avi is the one exception where CCE can't handle it) and use DGPulldown. Will let you all know, may have to just live with the jerkiness.

[aedipuss]

are you sure it's ntsc? most divx avis are 25fps. i've seen a lot of dixv and never come across a 24fps one.

[Maikeru-sama]

Well, the DGPulldown Option didn't work, got the same result.

aedipuss, what other methods could I use to check the FPS.

Also, I failed to mention this avi file was originally in enclosed in an OGM file. I used mencoder to "copy" (not encode) the avi file and the sub out of it. But remember, the copied avi file doesn't have any jerkiness, so mencoder copied it fine.

When I look in GSpot, drag the OGM and the copied avi file into Mplayer, each time it says 23.976 FPS.

Also, I am pretty positive that it is 23.976 FPS because the Subs I burned into the avi is in-sync with the audio. If it was really 25 FPS and I encoded it as 23.976 FPS, the audio, video and subs would be out of sync.

- Mike G.

[guns1inger]

Many of the avis I have seen/converted are 23.976 fps.

Process of elimination comes next.

1. Check carefully the original avi files post OGM extraction to make sure they are 100% smooth.

1a. Put an AssumeFPS(23.976) after the Load statement in your avs scipt and encode with CCE.

2. Use the same avisynth script and convert with HCEnc. Throw a Trim(0,2500) at the end to make the tests shorter.

3. Use the same avs script with DVD Flick (or use ffmpeg from the commandline if you are game) and see what results you get.

[Chris K]

and in CCE, I have 23.976 chosen and doing a 2:3 Pulldown.

Shouldn't this be 29.970 fps? Sorry if I'm wrong. I'm a pal guy.

I tried it with DVDLab with a 23.976 fps source and it offered me to convert it with pulldown.
But then when I look at the properties of the resulted conversion it says 29.970 fps.
Does the output of CCE also says 29.970 when you select 23.976 together with 2:3 pulldown?

Chris.

[manono]

Does the output of CCE also says 29.970 when you select 23.976 together with 2:3 pulldown?

Yes, encoding for progressive 23.976fps with pulldown applied either during the encoding or afterwards results in an MPV that plays at interlaced 29.97fps. You're lucky that, as a PAL person, you don't have to mess with this stuff.

[Maikeru-sama]

Thanks for the responses.

I figured out what my problem was.

I used VirtualDubMod to play the AviSynth Script and also the original AVI file and both were jerky. So Mencoder was the culprit. I have used Mencoder to copy several OGM files and it always worked fine, I guess this file was an exception. Anyway, I went back and used OGMDemuxer and the result was no jerkiness in the copied AVI file. I placed it on a DVD and it was fine as well.

Thanks for the help

- Mike G.