fftools/ffmpeg: stop using OutputStream.frame_number in print_report()

This field means different things when the video is encoded (number of
frames emitted to the encoding sync queue/encoder by the video sync
code) or copied (number of packets sent to the muxer sync queue).

Print the value of packets_written instead, which means the same thing
in both cases. It is also more accurate, since packets may be dropped by
the sync queue or bitstream filters.

0 files changed, 0 insertions, 0 deletions