On 03-08-2018 08:46 PM, Danil Iashchenko wrote:
+For most general-purpose filters, no conversion is required. + +In case a file contains an alpha channel supported by the format, then explicit conversion is a requirement.
This is unclear. So, if the input's pixel format has alpha, we should convert? to what? In the example below, the conversion target also has alpha. Does RGB24 need to be converted?
+@item +Insert a PNG logo in the top-left corner of the INPUT. Explicit format conversion is a must. +@example +-i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
PNGs, afaik, are always full chroma. Shouldn't we convert to yuva444p? Regards, Gyan _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
