Apparently get_bit_count is equal to get_pos, not get_remaining.
Apparently get_bit_count is equal to get_pos, not get_remaining.

Stupid porting error from ffmpeg, that lead to the problem of
parsing only the first line of each interlace field (so two lines total).

Appropriately fix to gst_bit_reader_get_pos and remove the FIXME-FFMPEG for those.

Still some parsing artifacts and warnings present though, but now the debug
image dumps are actually seen as real subtitles, with some just having a few lines
wrong.

leio/libdvbsub,leio/libdvbsub