Hi, I use melt (0.9) because of the videostab2 filter. Transcode is
practically unusable and there aren't any ffmpeg binaries available
yet with vid.stab enabled (as far as I know).
It is sad that the included version (0.75) is older than 3 years. The
developer was quite active in the meantime.
There is also an ugly bug in the melt version: it seems to ignore the
interpolation setting. The only way it gets reported (with -debug)
correctly, is to set "rescaler=name" for the consumer like:
melt -debug test.mlt -consumer avformat f=yuv4mpegpipe
rescale=bicublin | ffmpeg -i - image%02d.png
This outputs (along other lines):
Image Transformation/Stabilization Settings:
smoothing = 10
maxshift = -1
maxangle = -1.000000
crop = Keep
relative = True
invert = False
zoom = 0.000000
optzoom = On
interpol = Bi-Cubic (4) <== OK!
sharpen = 0.800000
Final zoom: 0.000000
Corresponding code section:
https://github.com/mltframework/mlt/blob/2308a7/src/modules/videostab/filter_videostab2.c#L168
However, no matter what interpolation setting is used, the image
always looks uninterpolated. Here is a sample with default settings
and the vectors:
1=0/0:0.02x0;2=0/0:-0.01x0;3=0/0:-0.014x0;4=0/0:0.0265x0;5=0/0:0.0123x0;6=0/0:-0.0178x0;7=0/0:-0.02044x0;8=0/0:0.01276x0;9=0/0:0.01111x0
Frames: http://imgur.com/a/q3khB#0
Original: https://en.wikipedia.org/wiki/File:Pm5544_ntsc-1.png
The code looks right, though:
https://github.com/mltframework/mlt/blob/2308a7/src/modules/videostab/transform_image.c#L674
For a normal video, this results in wobbling blocks.
Can this be fixed?
Best,
Adrian
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