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MP4 Diagnostics · A/V Sync Check · Windows

AthenaDoctor report showing track details and the Audio/Video Sync check, with an [OK] no structural problems detected summary

One click, one file, one report — codec, resolution, bitrate, and the Audio/Video Sync check, all on screen.

Free
Get it from Microsoft Store

No license · no account · ~6.6MB, standalone

Read the file.Trust the log.

AthenaDoctor opens any .mp4 and generates a full diagnostic report — codec, resolution, bitrate, and whether audio and video are actually in sync. Built to answer the question guesswork can't: what's really going on inside this file?

Free tool Full diagnostic log A/V sync check Windows 10 / 11 64-bit

Completely free — no trial, no license, no account. AthenaDoctor is a diagnostics companion distributed free on the Microsoft Store.

Get it from Microsoft Store

One file in. One report out.

AthenaDoctor reads your .mp4's internal structure directly — no re-encoding, no guessing — and lays out everything that matters in a single log.

01

Full diagnostic log

Every relevant detail about your .mp4 in one report — generated in seconds, no re-encoding involved.

02

A/V Sync checkCore feature

Reads the file's edit list (elst) to check whether audio and video actually line up — a number, not a hunch.

03

Codec & profile detection

Identifies H.264 or H.265, plus the declared Profile and Level for each video track.

04

Resolution & bitrate

Width x height and average bitrate, reported separately for video and audio.

05

Divergence alerts

Flags cases where the declared codec profile doesn't match what the video stream actually contains.

06

Save the report

Export the full log as text — handy to keep for reference or to share when asking for support.

07

Multilingual

Full interface in English, Brazilian Portuguese, Spanish, Japanese, Russian and Simplified Chinese.

08

Lightweight & free

Standalone executable, about 6.6MB, no installs beyond itself, no ads, no telemetry.

Why check A/V sync at all?

Without a log

Audio and video "feel" a little off after a recording, conversion or edit — but you're guessing whether it's the player, the source, or the file itself.

With AthenaDoctor

The report reads the file's actual edit-list and timestamps, so any drift shows up as an exact number — not a feeling.

Built on the same MP4-parsing engine used inside AthenaCut and AthenaRecorder — it reads exactly what the file says, frame timing included.

Free.Forever.

No subscription, no trial, no upsell. AthenaDoctor is a free diagnostics tool for Windows.

AthenaDoctorFree

Included, always

  • Full .mp4 diagnostic log
  • A/V sync check via edit-list (elst) parsing
  • Codec, profile, resolution and bitrate detection
  • Save the report as text
  • Windows 10 and 11 (64-bit)

How it works.

Point it at a file, read the report. No account, no configuration.

Install AthenaDoctor from the Microsoft Store — free, no account needed.

Open AthenaDoctor and select your .mp4 file.

Read the report: codec, resolution, bitrate, and A/V sync status, all at a glance.

Save the log as text if you want to keep it or share it when asking for support.

Free

no license · no trial · Microsoft Store

Get it from Microsoft Store