Spot consistency in subtitle file

[liloneum]

Time code in a subtitle file has to follow the spot numbering.

e.g.

<Subtitle SpotNumber="100" FadeUpTime="5" FadeDownTime="5" TimeIn="00:10:00:000" TimeOut="00:10:05:00">
  <Text VPosition="8" VAlign="bottom" HAlign="center" Direction="horizontal">Penultimate subtitle</Text>
</Subtitle>
<Subtitle SpotNumber="101" FadeUpTime="5" FadeDownTime="5" TimeIn="00:00:00:000" TimeOut="00:00:05:000">
  <Text VPosition="8" VAlign="bottom" HAlign="center" Direction="horizontal">Subtitle generated by mistake by the subtitle editor</Text>
</Subtitle>

[wolfgangw]

Lilian, thanks for the feedback. Actually, in TI's Subtitle Specification no mode of temporal ordering is specified. It was probably an inadvertent omission, though. S428-7, on the other hand, explicitly asks for a temporal stack (my word) where TimeIn shall be equal to or greater than the corresponding value in a preceding spot.

Allow me to think a bit about it. I am leaning towards a temporal sequentiality check, of course.

[liloneum]

OK. So why not just a hint for TI's Subtitles. You're right, subtitles are displayed not matter the order. For S428-7, I think the mxf will not be wrapped if it does not respect the rules...

[wolfgangw]

Because of the lack of specification the various implementations in the field might well be treating out-of-order subtitles differently. On which system did you test?

[liloneum]

I tried it on easydcplayer. I'll try it on a server as soon as it is possible.