By: Michael Lynch <git@mtlynch.io>
Derive video duration during processable video construction NewProcessableVideo now accepts a function that derives duration from the video path. This keeps duration validation inside ProcessableVideo construction while letting callers provide the probing implementation.
| Time to Start | Worker time | Duration | Time to finish | |
| Config | 2s | 5s | 5s | 7s |
| Eval | 6s | 1m40s | 1m40s | 1m47s |
| Build | 11s | 8m46s | 2m25s | 2m36s |
| Suite | 2s | 10m32s | 2m34s | 2m36s |