vd_lavc: better hwdec log output

Often, we don't know whether hardware decoding will work until we've
tried. (This used to be different, but API changes and improvements in
libavcodec led to this situation.) We will often output that we're going
to use hardware decoding, and then print a fallback warning.

Instead, print the status once we have decoded a frame.

Some of the old messages are turned into verbose messages, which should
be helpful for debugging. Also add some new ones.

0 files changed, 0 insertions, 0 deletions