Merge commit '74d98d1b0e0e7af444c933ea3c472494de3ce6f2'

Merge commit '74d98d1b0e0e7af444c933ea3c472494de3ce6f2'

* commit '74d98d1b0e0e7af444c933ea3c472494de3ce6f2':
  mpegts: Validate the SL Packet Header Configuration

See e630ca5111077fa8adc972fe8a3d7e2b3e8dc91f

Our local timestamp_len > 64 is adjusted to > 63 to match the Libav
check and the actual specifications (14496-1, 10.2.2).

There is no need to request a sample as it violates the specifications
and such a file would likely be the result of a crafted/fuzzed sample.

On the other hand, the clipping of the value is kept for extra safety.

Merged-by: Clément Bœsch <clement@stupeflix.com>