Spotted by Dmitriy Novash.

It could cause Mar 1 to be misinterpreted as Feb 32, which timegm()
then transforms into Mar 4 (only on some years, including 2019)

Add support for sdes and other items needed by the RIST protocol

See merge request videolan/bitstream!11

reference: TS 103 127 V1.1.1

In function scte35_validate psi_check_crc call execute without data
size check. The syntax flag in scte35 PSI by definition is false so
psi_validate will be true. In such case scte35_validate may overflow on
zero length PSI size.