The official Ut Video decoder only threads with slices, thus until now any files encoded by the libavcodec encoder have only been decodable with a single thread. The default slice count is now set to subsampled_height / 120.
Also sets slices to 1 for the Ut Video encoder tests to keep them green.
efec857 utvideoenc: Enable support for multiple slices and use them
libavcodec/utvideoenc.c | 37 ++++++++++++++++++++++++++++++++++---
tests/fate/utvideo.mak | 2 +-
2 files changed, 35 insertions(+), 4 deletions(-)