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cedf589c09
More commonly, this fixes the case of sws_setColorspaceDetails after sws_getContext, since the latter implies sws_init_context. The problem here is that sws_init_context sets up the range conversion and fast path tables based on the values of srcRange/dstRange at init time. This may result in locking in a "wrong" path (either using unscaled fast path when range conversion later required, or using scaled slow path when range conversion becomes no longer required). There are two way outs: 1. Always initialize range conversion and unscaled converters, even if they will be unused, and extend the runtime check. 2. Re-do initialization if the values change after sws_setColorspaceDetails. I opted for approach 1 because it was simpler and easier to reason about. Reword the av_log message to make it clear that this special converter is not necessarily used, depending on whether or not there is range conversion or YUV matrix conversion going on.