How to - Repair B-Frame corruption in Mp4 video

[ABBrittain]

I have an MP4 file about 1hour 40 mins in length about 2mins 46 sec in a b-frame appears to be corrupt the first play about bit appears at about 2 mins 56 sec later.

I've tried to use Avidemux, Avanti, winff and TX264, h264encoder and FFMPEG directly to recover this problem.

Nothing works - does anyone know how I could recover the file - other than going back to source, if possible?

[Selur]

I assume that the first sentence means:
a. you have an mp4 file which is 1h 40m long (with probably MPEG-4 AVC video content, since you mentioned h264encoder)
b. this file has a corrupt Frame at around 2m 46s and the exact same Frame appears intact at 2m 56s
c. you now want to know if there's a way to replace the broken frame with a copy of the non-broken frame
am I right with this interpretation?

Assuming that is what the first sentence was ment to say:
- you can't fix this without reencoding at least the gop in which the broken frame is
- in theory one probably could:
a. detect the GOP structure of the file and the settings the first file was created with
b. open the file in an avisynth script, trim the source to the gop which includes the broken frame
c. replace the corrupt frame with a copy of the intact frame
d. reencode the new GOP
e. cut out the broken OP and replace it with the newly encoded gop (this will only work if the settings found in a. are a decent match to the original encoding parameters)
In praxis:
I don't know if your knowledge of video editing is broad enough to do this.
If the knowledge if there it's probably not really hard to do this, but from my point of view it's mainly a question of 'is it worth the effort' since doing the stuff I mentioned above isn't totally trivial and reencoding the source is probably less time consuming.

Cu Selur

[theewizard]

how important is tht 10seonds to the story
open the video in avidemux
cut and safe 2:46 seconds
cut and safe from 2:56 to the end
join the two parts