Re: How to convert a JPEG image to an I-frame?

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Would the jagged edges appear because the source was meant for 50Hz Interlaced, while the hardware is set for 60Hz interlaced? I had a similar problem on my nvidia tv-out device, and had to revert back to older drivers.

nvidia-drivers 1.0.7185, is the last driver that still support setting the tv-out device to 50Hz, instead of the default: PAL 60Hz. Any driver that nvidia released later on, doesn't seem to support tv-out @50Hz, no xorg.conf settings will work. My card is an old Geforce4 440MX, so the new cards requires later drivers :(

I hope this maybe helps somebody.

Theunis

On 13/11/2007, Reinhard Nissl <rnissl@xxxxxx> wrote:
Hi,

Reinhard Nissl schrieb:

>> Yes, they are smooth for a brief moment, and then get jagged.
>
> I recall this behavior when I had a FF card for testing. Maybe it's a
> feature to stop flickering one pixel high horizontal lines in still
> images by doubling one field of the frame. Maybe there exists a switch
> to turn this feature off.

To prove the above mentioned behavior, please try this synthetic file:

http://home.vrweb.de/~rnissl/radio/field_test.mpg

Actually, it should display like here:
http://home.vrweb.de/~rnissl/radio/field_test.png

But if the above is true, you'll get some heavy flicker on TV and then
it will split the screen into a top and bottom half where one half will
be white and the other one black. This will happen when the FF card
decides to display just a single field of the frame.

> You've tried to repeat an I frame forever. Try to remove the sequence
> end code (00 00 01 B7) from the end of the file before mplexing and the
> MPEG program end code (00 00 01 B9) from the file after mplexing. Maybe
> remove everything up to the first video PES packet from the final file.

Bye.
--
Dipl.-Inform. (FH) Reinhard Nissl
mailto: rnissl@xxxxxx

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