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CAP MIDI
Not possible

Convert CAP to MIDI

Can you convert CAP to MIDI?
Verified by Adam B.· reviewed by FE Editorial ·updated Jul 2, 2026
QUICK ANSWER
Is it possible to convert CAP to MIDI?
No - not a direct conversion.

If your .cap file came from a network tool like Wireshark or tcpdump, it holds packet traffic and cannot produce MIDI. If it came from Capella music notation software, that is a different .cap format and Capella can export it to MIDI.

No direct path
Also to MIDI: GP · ABC · GP5

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert CAP to MIDI?

The primary .cap format is a binary network packet capture (libpcap or a vendor variant) storing timestamped Ethernet/IP/TCP frames - it contains no pitch, note, or rhythm data. The confusion arises because Capella music notation software also uses the .cap extension for an entirely different format; only the Capella version has any path to .MIDI.

How to convert CAP to MIDI

Capella APP

If your .cap is a Capella music notation file (Capella 2002 or earlier), open it in Capella and export to MIDI from the File menu.

Programs that convert CAP

Capella
MuseScore

About these formats

.CAP Packet Capture file (network trace) - primary meaning

A CAP file is almost always a network packet capture - a recorded snapshot of network traffic from a sniffer such as Wireshark, tcpdump, or a router. Open it with free Wireshark on Windows,…

Open .CAP details →
.MIDI Standard MIDI File (MIDI sequence)

A .midi file is a musical score - it stores notes, timing, and instrument commands, not recorded audio. Play it with VLC or Windows Media Player. To export it as MP3 or view the notes as…

Open .MIDI details →

Quality & what to watch

  • A network capture .cap starts with magic bytes D4 C3 B2 A1 (libpcap); a Capella music .cap will not match this signature - checking the file origin confirms which type you have.
  • MuseScore is listed as an associated program but does not open network packet capture .cap files and cannot produce MIDI from one.
  • No tool can convert a network capture to MIDI because the source data is network traffic, not music.

Frequently asked questions

How do I know which type of `.cap` file I have?
Check where the file came from - a network tool (Wireshark, tcpdump, airodump-ng) produces a packet capture; Capella music software produces a notation file. A libpcap file starts with bytes D4 C3 B2 A1.
Why do some sites list CAP-to-MIDI converters?
Those databases conflated two unrelated formats sharing the .cap extension: the network packet capture and the Capella music notation file.
Can I open a network `.cap` in MuseScore?
No - MuseScore handles music notation only and cannot read or interpret network packet capture data.