lavc: include timebase in avcodec string at debug level.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
ffmpeg: copy tmcd track timebase parameters

Fixes part of Ticket2045

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
movenc: Calculate fps for tmcd without intermediate step.

Fixes part of Ticket2045

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
movenc: check that fps for tmcd is within encodable range.

The fps is stored as a 8 bit value thus 255 is the maximum encodable.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>