Slight but noticeable color shift when using FFmpegFrameGrabber

[b005t3r]

Slight but noticeable color shift when using FFmpegFrameGrabber

[b005t3r]

I quickly tried setting the remaining fields of picture_rgb like so:

                picture_rgb.color_trc(AVCOL_TRC_BT709);
                picture_rgb.colorspace(AVCOL_SPC_BT709);
                picture_rgb.color_primaries(AVCOL_PRI_BT709);
                picture_rgb.color_range(AVCOL_RANGE_MPEG);

but for no noticeable results.

I guess, in theory, sws_scale() should be able to make the necessary color conversion automatically, if these were set correctly for both input and output (which they were, after the above change), but there was no change.

[saudet]

The first thing I would check is if we save the images to PNG files with a different library, is the result the same?