There are MPEG TS files where subtitle packets are multiplexed with
audio and video packets properly, meaning that packets that are supposed
to be shown/played together are also stored next to each other. However,
the timestamps in the PES streams have huge differences. For example,
the first timestamps for audio and video packets are around 00:11:08.418
whereas the timestamps for corresponding subtitle packets start at
09:19:25.912.
This workaround attempts to detect such situations. In that case
mkvmerge will discard subtitle timestamps and use the most recent audio
or video timestamp instead.
Implements #1841.
Before the defaults were applied before the result was stored in the
cache. The problem with that is that changing the defaults in the
preferences did not affect cached results. Adding a file the second time
was using cache data which had the old defaults applied.
Now the defaults are applied after the result has been stored in the
cache. Upon retrieval from the cache the current defaults are applied,
too.
In this case the track contains MP3 data. However, the ESDS's object
type ID field is set to 0x6b in the headers indicating MP2. Additionally
the track's fields for channels & sampling frequency are set to 0.
Fixes#1844.
