movenc: Check for allocation failures in mov_create_chapter_track

Signed-off-by: Martin Storsjö <martin@martin.st>
movenc: Check that tracks->enc exists before trying to free extradata

Signed-off-by: Martin Storsjö <martin@martin.st>
movenc: Properly free allocated data on failures in mov_write_header

Signed-off-by: Martin Storsjö <martin@martin.st>
movenc: Check for errors from mov_create_chapter_track

On failures in the write_trailer function, we could also ignore
the errors and try to finish the file despite these errors (which
would only leave an incomplete chapters track). It's probably better
to signal the error clearly to the caller though (and if this
function failed there's no guarantee that there's enough memory to
finish the trailer either).

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '4d122b01e4ce539269ee2df193b061772c7374f6'

* commit '4d122b01e4ce539269ee2df193b061772c7374f6':
  movenc: Check for allocation failures in mov_create_chapter_track

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '3559fb97c459c88b4f1d0eef80d55933d3b7fabe'

* commit '3559fb97c459c88b4f1d0eef80d55933d3b7fabe':
  movenc: Check that tracks->enc exists before trying to free extradata

Conflicts:
	libavformat/movenc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '2bbad1f94cbc5eab0aa2d937bc79d085477d0242'

* commit '2bbad1f94cbc5eab0aa2d937bc79d085477d0242':
  movenc: Properly free allocated data on failures in mov_write_header

Conflicts:
	libavformat/movenc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  movenc: Check for errors from mov_create_chapter_track

Merged-by: Michael Niedermayer <michaelni@gmx.at>
libavutil: cast truncated values to uint32_t

programs using ffmpeg that are compiled with -Wshorten-64-to-32
gives a warning when using header files common.h and rational.h

cast 64-bit truncated values to (uint32_t) to avoid the warning

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