v4l2_stateful_decoder: modify -w option to output decoded frames and single yuv file

v4l2_stateful_decoder currently generates single yuv file
per each frame. This CL makes change to generate
single yuv file per bitstream as well.

BUG=b:181681793
TEST=v4l2_stateful_decoder --file=./1080p_30fps_300frames.vp9.ivf -w

Change-Id: I195c15e362f3b7524af8da25a185cc2256afd510
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/drm-tests/+/2737594
Tested-by: Steve Cho <stevecho@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Steve Cho <stevecho@chromium.org>
1 file changed