MP4 to MIDI Converter Online
Turn MP4 performance, lesson, or rehearsal videos into editable MIDI notes. MelodyTrace normalizes the MP4 input, transcribes its audio, and gives you a piano-roll result to review.
- MP4
- Audio track extraction
- Editable MIDI
Click a note to hear it
How it works
Upload MP4
Choose MP4 performance, lesson, or rehearsal videos up to 50 MB and 10 minutes. The visual stream is ignored and the first audio track is extracted.
Review the transcription
Play the detected notes on the piano roll, compare them with the source, and adjust sensitivity, minimum note length, or pitch bends when needed.
Edit and download MIDI
Download the result immediately, or sign in to correct notes and export notation for the next step in your music workflow.
Formats & limits
- Input formats
- MP4
- Output
- MIDI (.mid)
- File limits
- 50 MB · 10 min
- Price
- Free · no sign-up
Preparing MP4 for a cleaner MIDI result
- Trim the video to the performance passage you need and favor clips where the target instrument is clearly audible.
- A clear single melody, vocal, or instrument line usually needs less cleanup than a dense finished mix.
- Trim long silence and unrelated sections before uploading so the transcription focuses on the passage you need.
- Speech, applause, and backing tracks are part of the extracted audio and can introduce unwanted notes.
Frequently asked questions
How do I convert MP4 to MIDI?
Upload the MP4 file — MP4 performance, lesson, or rehearsal videos all work — and it's normalized and sent through the same Basic Pitch transcription engine used for every audio source on this site; there is no separate MP4-specific model, so the file format itself has no bearing on transcription quality, only on how the audio decodes going in. The result lands on an interactive piano roll where you can play it back against the source, adjust detection sensitivity or minimum note length, and re-transcribe without uploading the file again if the first pass needs tuning. Once it looks right, download the generated .mid file directly with no account required at all, or sign in first to unlock full note editing plus exporting the result as MusicXML or PDF sheet music alongside the plain MIDI download.
Does the MP4 video image affect the MIDI?
No — the video stream is decoded and discarded entirely before transcription starts; only the first audio track is extracted and analyzed for notes, using exactly the same pitch-detection pipeline as any pure-audio upload on this site, so there is nothing video-specific about the transcription quality itself. This means picture quality, resolution, frame rate, lighting, and any on-screen visuals in the MP4 file have zero effect on the result — a shaky phone recording and a studio-shot video transcribe identically as long as the audio itself is comparable. A video with multiple audio tracks, such as alternate-language dubs or separate music and dialogue stems, only uses whichever one is flagged as the primary track in the file, so isolate or re-mux the track you actually want beforehand if your source has more than one embedded.
What MP4 files work best?
Trim the video to the performance passage you need and favor clips where the target instrument is clearly audible. Speech, applause, and backing tracks are part of the extracted audio and can introduce unwanted notes. Beyond those format-specific points, the same rule applies as for any source: a single clear melody or solo instrument transcribes far more accurately than a dense mix, since the underlying transcription model was evaluated on isolated, largely monophonic material rather than multiple instruments layered together in a full production. If a first attempt comes back with noticeably more wrong or extra notes than you expected, that's usually a sign the source has more going on musically than a solo line — try isolating just the part you actually need, either by re-recording it alone, muting other tracks before bouncing a mix down, or using a separate stem-splitting tool first, then re-upload that isolated part instead of the full mix.
What are the upload limits?
Each file can be up to 50 MB and roughly 10 minutes long, a ceiling that comfortably covers the vast majority of performance clips, lessons, and rehearsal videos people upload here without needing to trim anything first, since most individual songs, practice takes, or short clips fall well under both limits. Short, focused passages finish transcribing sooner and are noticeably easier to verify against the original on the piano roll afterward, simply because there's less material to scroll through and compare note by note before you trust the result. If your source runs longer than that ceiling, cutting it down to the specific section you actually need — rather than uploading the full file and discarding most of the transcribed result afterward — is usually both the faster and the more accurate path, since trimming also removes whatever unrelated audio elsewhere in the file might otherwise confuse the transcription.