This is a testharness.js-based test.
[FAIL] last frame at 10
  assert_approx_equals: source_buffer.buffered.end() after append expected 0.45833333333333337 +/- 0.000001 but got 0.458332
[FAIL] last frame at 22
  assert_approx_equals: source_buffer.buffered.end() after append expected 0.9583333333333333 +/- 0.000001 but got 0.958332
Harness: the test ran to completion.