Hi Christoph,
Am 03.04.21 um 00:42 schrieb Christoph Gerstbauer:
Hello, forget my last mail. The original video is destroyed in the first place.
If you SPLIT the fields from the original MPG you see PER FIELD interlacing
artefacts. That is a sign that the original video from tape was not correctly
DEINTERLACED (25i-> 50p -> 25p) when going into MPG format.
You see in the picture TOP field and Bottom field of the MPG file.
Normally NO interlacing lines should be in one FIELD.
I was thinking about an algorithm, which could work as follows:
1. Extract all 2nd lines from a frame
2. Rebuild planes
3. Intelligently filter or move the stripes horizontally
4. Merge the planes or create a stream with double frame rate to create a
visually better video.
I was in hope, that such algorithm exists somewhere
See attached file.
So I guess the way of the signal was:
1. ) TAPE (I guess betacam or imx): Interlaced top field first (25i)
2.) digitized into file as PROGRESSIVE 25fps without handling the interlacing.
(25p)
3.) ENCODING to MPG with a bottomfield first flag, but already destroyed fields....
(25"i"/p)
Seems probable.
This can not be repaired.
Thanks for your thoughts,
-Ulf
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