Dub Packs build on Voice Pack-style prompts, but Dub Mode needs a video and metadata that tells the game when each sample belongs in that video. Treat it as an advanced format, not a Voice Pack with one extra file.
The official Dub workflow requires OGV because of the video support available to the game. Convert and play one small scene before preparing many lines.
Use a small set of clearly distinct lines so you can recognise a timing error immediately during testing.
Record the timing information that tells the game where the sample belongs in the video. Validate each entry against the scene, not against memory.
Test the Dub flow through to the saved combined playback. Check both individual retakes and the final sequence.
Do not carry Voice Pack filename assumptions into Dub metadata. OGV and per-sample timing are required parts of the Dub workflow.
Ready to test
Quick answers
Most Dub Pack failures come from treating video timing or the video format as optional.
Next step
Validate one short scene, its OGV file, and each timing entry before adding a larger set of lines.