MPEG-4 video gives still but audio plays FW 3.1.3

Hi, I have a Iphone 3GS 32 with 3.1.3 installed and discovered that MPEG-4 files don't play video and some H264 video stops after c.a. 40 seconds for c.a. 60 seconds.
I have tried to convert with Itunes, but Itunes gives the message that the fileformat is correct and does not have conversion neceserry.
Withe the MP4 issue the audio sounds good and my screen is displaying a stil with a green bar right below. On 3.1.2 everithing was all right. I have tried to downgrade to 3.1.2 but that is restricted.
I have checked the playing of the same files on my old 3G 16 with 3.1.2 and the files are playing well.
I also discovered with playing H264 files that the stop after ca 40 seconds for 1 minute and then go on. The movie time us running from 0:40 - 1:48 but audio and video stops. After the 1:48 the movie is continuing well????
In the Ipod discussions i saw same issue wit FW 3.1.3, but i have posted it also in the Iphone discussion.
Hopefully Aplle fixes this verry soon!!
THX in advance for any suggestion to make it work,
Wim

I have downloaded the latest Danuisoft DVD ripper and ripped the movies again and they run in 320*240 H264 and MPEG-4 format.
Strange that they run in the 3.1.2 FW and not in the 3.1.3 FW. Maybe someting to dow with the solved MPEG-4 flaw.
So now i have to convert my 30 movies again.
THX for your suggestion whatheck
I am concerning also the right choice of the 3GS. It is faster, but i get anoying messages about diverting when i call somebody, i have to convert my movies again. But stil its faster.
On my good old 3G that was jailbroken and i could customize al the anoying messages and now Apple is avoiding all this customizing by FW's that could not be customized. Why not an open system so that i can choose by miself as user of a beautyfull piece of technology that supports me on the road with Phone, Internet, AV, Entertainement and Land/Nautical Navigation aids.
So next sunday it wil be bad wether so that i can take the time to do the converting work.
THX a lot,
Wim

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