Hello, Can someone help me to understand the xfade filter documentation regarding custom expressions. I'm not really sure how to express a transition given the variables provided.
"XY - The coordinates of the current sample." - Is the transition defined by selecting a color/state for each pixel? "WH - The width and height of the image." - OK. "P - Progress of transition effect." - Looking at the source, this is a float. Ranging from 0-1 I assume(?) "PLANE - Currently processed plane." - Not sure what this means. How many planes are there? I'd say at least 2, one for each input. Are there more? "A - Return value of first input at current location and plane." - This would return something like first_input[x][y] if the input were treated as an array? But I still don't understand what the plane refers to OR what the value returned would be. Would it be 0 or 1, or some color value? "a0(x, y) a1(x, y) a2(x, y) a3(x, y) - Return the value of the pixel at location (x,y) of the first/second/third/fourth component of first input." - What does 'component' refer to? 1234 == RGBA ? Is there an example that illustrates how to use a custom expression to achieve a meaningful transition? Thank you! _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
