How to fix choppy / laggy video? (no hardware lag)

[doomed9]

Hello. Does someone know how to fix a choppy / laggy video? It's not choppy because of slow hardware, rather because of faulty encoding / editing. Sometimes it just plays like with a framerate of 3 FPS. Unfortunately I don't have a chance to get the original source video. So, maybe someone knows a trick or a tool to fix the video?

Here are some specs of the mentioned file:
Video: XVID / Avi, 672x504, 23.976023 FPS
Audio: MPGA, Stereo, 48000 Hz, 128 kb/s (only the videostream is choppy)

[guns1inger]

Start with a full Tree view from mediainfo of the file.

Next, try loading it into avi demux and see if you get any warnings. If it asks to rebuild anything, let it.

Next, try going through the lagging parts frame at a time in virtualdub (assuming it loads). Are all the frames there, or have some frames been duplicated ?

[doomed9]

1.

General
Complete name                    : C:\dub-af-edit 7.avi
Format                           : AVI
Format/Info                      : Audio Video Interleave
File size                        : 700 MiB
Duration                         : 3h 10mn
Overall bit rate                 : 514 Kbps
Writing application              : VirtualDubMod 1.5.4.1 (build 2178/release)
Writing library                  : VirtualDub build 32706/release

Video
ID                               : 0
Format                           : MPEG-4 Visual
Format profile                   : Advanced Simple@L5
Format settings, BVOP            : Yes
Format settings, QPel            : No
Format settings, GMC             : No warppoints
Format settings, Matrix          : Default (H.263)
Muxing mode                      : Packed bitstream
Codec ID                         : XVID
Codec ID/Hint                    : XviD
Duration                         : 3h 10mn
Bit rate                         : 376 Kbps
Width                            : 672 pixels
Height                           : 504 pixels
Display aspect ratio             : 4:3
Frame rate                       : 23.976 fps
Resolution                       : 8 bits
Colorimetry                      : 4:2:0
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.046
Stream size                      : 513 MiB (73%)
Writing library                  : XviD 1.2.1 (UTC 2008-12-04)

Audio
ID                               : 1
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 3
Mode                             : Joint stereo
Format_Settings_ModeExtension    : MS Stereo
Codec ID                         : 55
Codec ID/Hint                    : MP3
Duration                         : 3h 10mn
Bit rate mode                    : Constant
Bit rate                         : 128 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 48.0 KHz
Stream size                      : 174 MiB (25%)
Alignment                        : Aligned on interleaves
Interleave, duration             : 42 ms (1.00 video frame)
Interleave, preload duration     : 504 ms

2. Avidemux doesn't show any warnings, but it asks: "Packed Bitstream detected. Do you want me to unpack it?"

3. - "Are all the frames there?" How can i check this?
- "or have some frames been duplicated?" In the lagging parts of the video, some frames look very similar, but they don't seem to be exact duplicates.

I'm afraid that the video seems to be an assembly of many different clips with differents formats cobbled together. Probably it's not worth the efforts. I just thought there is maybe a program which can "repair" it automatically.

[Soopafresh]

http://www.videohelp.com/tools/DivFixPP

[doomed9]

Thanks for the help soopa, but unfortunately this tools didn't solve the problem.

[aedipuss]

try having avidemux re-write the file. import source, set video and audio to copy and type to avi. click save video.

see if the new one plays.

[guns1inger]

I hope it is pretty much static pages, because that bitrate at that resolution isn't going to be pretty.