Challenge 1: A Crash Mid-Recording With MP4 Format — Solution Walkthrough

What likely happens to the recording:

Per this chapter's own material, an MP4 file can become entirely
unplayable if the recording is interrupted before it's properly
finalized. Since the crash happened partway through the two-hour
session, the recording was never given the chance to complete its
normal finalization process, meaning the entire two hours of footage
is at real risk of being lost or corrupted, not just the final few
seconds.

Why MKV would have changed the outcome:

Per this chapter's own material, an MKV file remains playable right up
to the point of interruption, even if the recording never gets a
chance to finalize normally. If this same session had been recorded in
MKV format, the crash would still have ended the recording abruptly,
but everything captured up to that moment would remain intact and
playable — only the recording after the crash would be missing,
rather than risking the entire two-hour file.

Why this matters practically:

This is exactly why this chapter recommends MKV for the actual
recording session itself, with remuxing to MP4 only afterward, once
the session has ended safely — the format choice made before recording
begins directly determines how much is recoverable if something
genuinely goes wrong mid-session.

WHY THIS WORKS AS AN ANSWER
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This exercise is a direct, practical application of this chapter's own
MKV-vs-MP4 crash-resilience material to a concrete, high-stakes
scenario (a full two-hour session at risk).