Danil,
On 04-08-2018 12:43 AM, Gyan Doshi wrote:
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?
These are the only outstanding issues in this patch. Clarify them and I
can push tomorrow.
Regards,
Gyan
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