There is so much more I’d like to understand from your description of your issue, but I don’t understand your commentary. But, as it isn’t in English, I’m struggling too! You’ve asked in English so I’m you can write it. Could you do the same but written?
Your “donker” frames look like its some repetitive Pan/Crop switching.
Need something more in English for me. Maybe others will understand better than I?
* Grazie
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge