Add output counter for video file naming

[scepter-architect]

Prevents similar named outputs from overwriting each other. Simple solution to avoid unwanted data loss.

Test by putting a series of long prompts into a batch where the beginning of the prompts are all the same:

text_prompt
" This is a test prompt that illustrates the issue of data loss where similar prompts will overwrite one another leading to unwanted data loss <S>Ovi is really cool, its pretty neat<E> <AUDCAP>Clear voice speaking<ENDAUDCAP>"
" This is a test prompt that illustrates the issue of data loss where similar prompts will overwrite one another leading to unwanted data loss <S>Ovi is really cool, its actually amazing<E> <AUDCAP>Clear voice speaking<ENDAUDCAP>"
" This is a test prompt that illustrates the issue of data loss where similar prompts will overwrite one another leading to unwanted data loss <S>Ovi is really cool, I really like Ovi<E> <AUDCAP>Clear voice speaking<ENDAUDCAP>"

The last prompt output will overwrite the other two on the filesystem. This PR offers a solution.