27 Apr 2021, 10:55

First i supposed that is just problem of my TV, but after experiments with retropie' tweakwec found out that this is a some programm issue, and I don't think I'm the only one who's experienced this, cause:

*The default NTSC and PAL modes are enough for most cases where you might want to output composite video, but the Pi's video encoder is actually capable of much more than that.

PAL-M was always broken in the official firmware, and things like PAL60 were never implemented properly, either. The Pi can do both of these, and even SECAM turned out to be implemented in hardware.

Why?
The factory NTSC and PAL modes cover most typical cases for a composite output. So why you might want to use this tool?

On a display that supports it, PAL60 and/or NTSC 4.43 may produce sharper image than regular NTSC, while retaining the 60 Hz 480i or 240p raster favoured by retro enthusiasts.
You may some old sets from e.g France or Russia that only supports SECAM, or from Brazil that only supports PAL-M. tweakvec lets you revive such sets without hardware mods - although the video quality will generally be worse in those modes compared to regular PAL or NTSC.
Even if you don't need any of these special modes, tweakvec gives you access to some additional settings, such as setting horizontal position of the image, and relative horizontal position of luminance and chrominance signals.*