>As soon as I get rid of -I active, the thing is going very well .... :-( ??
>Am I using bad values ???
Nope, the values are fine, but they are triggering a bug.
(I remember this problem arising before, somewhere, but I don't remember
what the resolution was.)
...
> INFO: [y4mscaler] === SOURCE parameters: =================
> INFO: [y4mscaler] < stream:
> INFO: [y4mscaler] < 1280x960, SAR 1:1, progressive
> INFO: [y4mscaler] < chroma subsampling: 420_MPEG2
> INFO: [y4mscaler] < chroma ss ratios: x 1:2 y 1:2
The clues are here:
> INFO: [y4mscaler] < active region:
> INFO: [y4mscaler] < 0.765387x2.637279 at 80.404124,43.104995
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> INFO: [y4mscaler] < matte region:
> INFO: [y4mscaler] < 1280x960 at 0,0 (bg Y'CbCr: 16,128,128)
> INFO: [y4mscaler] === SCALING parameters: ================
> INFO: [y4mscaler] | Scaler: Matto's Generic Scaler
> INFO: [y4mscaler] | kernels: sinc:5, sinc:5
> INFO: [y4mscaler] === TARGET parameters: =================
> INFO: [y4mscaler] > stream:
> INFO: [y4mscaler] > 720x576, SAR 59:54, progressive
> INFO: [y4mscaler] < chroma subsampling: 420_JPEG
> INFO: [y4mscaler] < chroma ss ratios: x 1:2 y 1:2
> INFO: [y4mscaler] > active region:
> INFO: [y4mscaler] > -6x576 at 6,0 (bg Y'CbCr: 16,128,128)
and here:
> INFO: [y4mscaler] > X ratio: 15181/24298
> INFO: [y4mscaler] > Y ratio: 895679/1312092
...
The bug is that ratios are represented as a pair of 32-bit ints, and
the larger-than-usual numbers here (big frames) are causing the ratio
calculations to overflow.
As a work-around for right now, if you change the active region size
to something with more small factors, e.g. 1180x850, you'll avoid
the overflow and the size/scale-factors will look much more reasonable,
like this:
INFO: [y4mscaler] === SOURCE parameters: =================
INFO: [y4mscaler] < stream:
INFO: [y4mscaler] < 1280x960, SAR 1:1, progressive
INFO: [y4mscaler] < chroma subsampling: luma plane only
INFO: [y4mscaler] < chroma ss ratios: x 1:1 y 1:1
INFO: [y4mscaler] < active region:
INFO: [y4mscaler] < 1180.000000x848.953704 at 78.000000,40.546296
INFO: [y4mscaler] < matte region:
INFO: [y4mscaler] < 1280x960 at 0,0 (bg Y'CbCr: 16,128,128)
INFO: [y4mscaler] === SCALING parameters: ================
INFO: [y4mscaler] | Scaler: Matto's Generic Scaler
INFO: [y4mscaler] | kernels: cubicK4, cubicK4
INFO: [y4mscaler] === TARGET parameters: =================
INFO: [y4mscaler] > stream:
INFO: [y4mscaler] > 720x576, SAR 59:54, progressive
INFO: [y4mscaler] < chroma subsampling: luma plane only
INFO: [y4mscaler] < chroma ss ratios: x 1:1 y 1:1
INFO: [y4mscaler] > active region:
INFO: [y4mscaler] > 720x566 at 0,5 (bg Y'CbCr: 16,128,128)
INFO: [y4mscaler] > X ratio: 36/59
INFO: [y4mscaler] > Y ratio: 2/3
INFO: [y4mscaler] Output Stream Header:
INFO: [y4mscaler] >>> frame size: 720x576 pixels (414720 bytes)
INFO: [y4mscaler] >>> chroma: luma plane only
INFO: [y4mscaler] >>> frame rate: 30000/1001 fps (~29.970030)
INFO: [y4mscaler] >>> interlace: none/progressive
INFO: [y4mscaler] >>> sample aspect ratio: 59:54
-matt m.
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