Stefan Pöschel authored Aug 02, 2016 and Bastien Nocera committed Aug 02, 2016

The MPEG-2 TS magic made assumptions which do not hold for the first
packet of every MPEG-2 TS, e.g. that the Continuity Counter is 0 or
the Payload Unit Start Indicator is set.

This alternative approach exploits the fixed packet size of 188 bytes
(192 bytes with BDAV MPEG-2 TS) and checks the first five packets for
the Sync Byte 0x47.
The used offsets partly seem to be a bit high in contrast to other
formats, but MPEG-2 TS files are usually much bigger than that.

https://bugs.freedesktop.org/show_bug.cgi?id=51118