Predator could not provide any possible suspects.
Assigning to the concern owner from the CL --
https://chromium.googlesource.com/chromium/src/+log/6a69033c6082f3fc61ffbe7876eb88a83e44d08b..43a5c81154242b1297c669ab28db4de1fd1ff080?pretty=fuller&n=10000

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/2ad785825859b6be6964d484a1d6a5f3f2c2ded5

@wolenetz -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

Duplicate of bug 759277: huge trun.sample_count causes OOM
P3 and marking duplicate
CC+=CF folks and dalecurtis@ like previously done on bug 759277

ClusterFuzz has detected this issue as fixed in range 509426:509671.

Detailed report: https://clusterfuzz.com/testcase?key=6669575533101056

Fuzzer: libFuzzer_mediasource_MP4_AACSBR_pipeline_integration_fuzzer
Job Type: mac_libfuzzer_chrome_asan
Platform Id: mac

Crash Type: Out-of-memory (exceeds 2048 MB)
Crash Address: 
Crash State:
  mediasource_MP4_AACSBR_pipeline_integration_fuzzer
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=499767:499873
Fixed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=509426:509671

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6669575533101056

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

https://chromium-review.googlesource.com/c/chromium/src/+/720206 may have fixed this.