958167c4f7
Back in an older commit, the default YUV colorspace was changed to 601 in order to ensure correct playback in video players that ignore the contents of the H264 header. x264's "undef" is unfortunately not what players that don't ignore the header expect for BT.601, resulting in incorrect colors when played back. Setting it to "bt470bg", similar to what is specified in ffmpeg outputs, remedies this issue.