WalterT AA+ watermarks your videos with their logo?? Why on earth would they have thought that was acceptable.
Since MP4 is produced in the tablet, and not in the Raspberry Pi, both the 2nd generation and 3rd generation ASIAIR watermark the MP4 videos. The 1st generation is not capable of recording videos, so it does not apply.
I have created MP4 videos from the cameras on the macOS without including watermarks, using the INDIGO server. So, it is definitely ZWO attempting to advertise the ASIAIR to the FaceBook and YouTube idiots, by forcing the watermark to always appear. It is not an inherent problem in macOS, and I believe iOS treats MP4 similarly.
In any case, one should avoid using MP4 anyway, since the color components are already mushed together (possibly using Yuv) and then compressed. I.e., any Luma component already includes the R, G and B components from the sensor, and once compressed, the original color components cannot be extracted independently. It is impossible to correctly separate the color components when processing the MP4 files to account for atmospheric dispersion. So, ASIAIR watermarks is not really an issue, since serious people do not use MP4 anyway.
Just save as AVI to get a proper recording of the color separations, and without the ASIAIR watermark, to boot.
The AVI in ASIAIR are created from the raw camera captures. The raw data is then given to iOS (in the tablet) to be converted by iOS into MP4, after a watermark layer is placed on it. This is also why MP4 is not available in the ASIAIR storage -- it is converted by iOS in the tablet and saved to the Photos folder in the tablet.
Chen
