Premiere rendering jerkyness or acceleration rendering with MJPEG sources.

[Sennyotai]

I've been having issues with rendering video originally captured to MJPEG using the screen-capture application PlayClaw. The original video plays fine in VLC and WMP. The issues come when i try to render it out of Premiere. Sometimes the rendered video is sped up (like it took a 20fps video and is playign at 30fps) when both source output fps are the same.

Example: http://www.youtube.com/watch?v=qIeJZE18G08#t=1620s

The other issue is sometimes with the exact same video (same soruce, same timeline, even same output settings) the video will start to stutter.

Example: https://www.dropbox.com/s/fezlb1ah7v8dnod/Test%20Render.mp4

I normally output h264 video, but also tried mpeg2 and it still happened.

My recording setup records video, game audio, and commentary all to seprate files. And the speedup/stutter/desynch doesn't appear in the previews while doing the editing.

So im sorta at a loss on how to fix the issue... (besides recording in raw video, but i dont really have the space to be doing 3+hr of 720p raw)

[pandy]

Probably source format use variable frame rate - search on videohelp for guides how to deal with variable frame rate video - some codecs are designed for constant frame rate only and to use them with vfr video some tricks need to be used.

[Sennyotai]

triple checked the source file and even popped it into MediaInfo again.

Video
ID                                       : 0
Format                                   : JPEG
Codec ID                                 : MJPG
Duration                                 : 10mn 49s
Bit rate                                 : 18.0 Mbps
Width                                    : 1 264 pixels
Height                                   : 682 pixels
Display aspect ratio                     : 1.85:1
Frame rate                               : 25.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:4:4
Bit depth                                : 8 bits
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.835
Stream size                              : 1.36 GiB (100%)

This was a test recording to try and narrow down the render issues. I was renering at 25fps to match the recording with this one. Its not Variable Frame Rate.

[pandy]

Sorry but MediaInfo is not very reliable source of information, bitrate for MJPEG, 25 fps, with such resolution is to low...

perhaps ffprobe on source file can show some interesting info?
http://ffmpeg.org/ffprobe.html

[Sennyotai]

different source clip this time. (needed the drive space back) i switched back to 30fps recording and rendering. same stutteryness/acceleration issues.

ffprobe:

Input #0, avi, from 'D:\Recording\java 2013-01-12 13-18-59.avi':
  Duration: 00:07:36.63, start: 0.000000, bitrate: 15732 kb/s
    Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p, 1280x720 [SAR 1:1 D
AR 16:9], 30 tbr, 30 tbn, 30 tbc

any specific options i should probe with?

also ive just enabled gpu rendering in premiere and thats fixed the crashing with the Low Compression recordings, but id still prefer the mjpeg recordings if this is render-sillyness fixable.