MP4 to AVI conversion results in a ghost-effect video .. !

[ahmadka]

Hi guys ... Well I have some old university lectures which I'd like to convert from MP4 to AVI, as in MP4 form they take a lot of space ..

I'm using this software called Pazera free MP4 to AVI Converter ... The tool itself seems to be working fine .. The only problem I'm getting is this effect which causes stuff from previous frames to remain in the visual area, till a keyframe comes along and clears all old data ..

Here's a picture of this effect:


Here is the snapshot from two frames later:


This is an upload (around 200 MB) which has an original 5 minute record and its converted form .. The effect can be seen in this ..Its very simple and straight forward to download from here:

http://ifile.it/yxakob4

For conversion I'm using the FFmpeg MPEG4 codec .. Unfortunately the tool doesn't have the option to open the codec dialog box to fully tweak its settings .. I can only see the bitrate and frame rate from the main window .. However, this is the commandline the program used to do the encode:

-y -i <input_file> -vcodec mpeg4 -b 1500k -acodec libmp3lame -ar 44100 -ac 1 -s 848x480  <output_file>

... so maybe I can change parameters manually myself from the commandline ..

So any clues on how I can get rid of this 'ghost-like' effect .. ?

I tried many different freeware/shareware/trailware tools for the conversion .. This one seems to provide the best result .. others gave my problems such as a/v sync issues, incorrect resolutions, etc .., as well as the issue discussed here ..

[guns1inger]

Personally I think you are going about this the wrong way. Mpeg-4 (Xvid/Divx) in an AVI container will produce much lower quality at the same bitrate a H264 in an MP4 container. If your goal is simply to reduce the file size, encode the file with H264 at a lower bitrate than it has now. You will get a much better outcome.

As for your ghosting problem. The first place I would look is at the dubious software you are using. XmediaRecode or Xvid4PSP will do a far better job, and give you control over all the settings you need. If you are still getting ghosting it may be related to the codecs being used for decoding.