Original video that I want to fix:

Stream #0:2(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 640x496
[SAR 1:1 DAR 40:31], 1708 kb/s, 25 fps, 25 tbr, 12800 tbn, 30k tbc

What was wrong: DAR should be 4:3, not 40:31.

With various attempts I can only get results like this:

Stream #0:2(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 640x496
[SAR 1:1 DAR 40:31], 1708 kb/s, SAR 4:3 DAR 160:93, 25 fps, 25 tbr,
12800 tbn, 30k tbc

Notice that I can only manipulate the SAR/DAR outside of the brackets,
what's inside the brackets remain the same.

Comare this (original):
[SAR 1:1 DAR 40:31]

With this (touched by avconv):
[SAR 1:1 DAR 40:31] SAR 4:3 DAR 160:93

It seems the parameters in brackets are immutable, why is that?

Thanks a lot!
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