Stream copy
FFmpeg copies encoded audio packets instead of decoding and encoding them again.
Extract Original Audio from Video
Extract the first audio track from video into MKA without re-encoding. Preserve the source codec and quality with fast, private browser-local stream copy.
Local conversion workspace
Convert video to audio
Your video stays on this device. Processing starts only after you click Convert.
0 bytes uploaded
0 bytes uploadedMulti-thread mode is used only when this browser supports SharedArrayBuffer and cross-origin isolation.
Original audio
Extract without re-encoding
Copy the first audio track when speed and source fidelity matter most.
MKA container
Matroska Audio can hold common source codecs without pretending every stream is valid M4A or MP3.
Packet-boundary trimming
Cuts can land near, rather than exactly on, the requested time because encoded packets are kept intact.
Workflow
How to extract the original audio track
Preserve the source stream and verify downstream compatibility.
Choose Original
Select the video and switch the output format to Original before converting.
Trim only if needed
Leave the full duration for the cleanest copy, or accept packet-level timing when trimming.
Check MKA support
Play the file in VLC or another capable player, or transcode a working copy later.
Privacy boundary
Fast extraction without upload
Stream copy still happens entirely inside the local browser worker.
- Source codec is preserved
- No generation loss
- The MKA container may need a compatible player
FAQ
Original audio extraction questions
Clear limits of stream copy, MKA, and source codecs.
MKA safely contains many audio codecs. Renaming an AAC, Opus, Vorbis, or AC-3 stream to MP3 would be incorrect.
Usually, because it skips audio decoding and encoding. Reading and writing a large file still takes time.
Version one extracts the first audio track only.
Copy mode preserves encoded packets, so cut points follow packet boundaries instead of creating new samples.
Support varies. VLC and capable media apps usually work; MP3 or M4A is safer for built-in players.
No. Stream copy preserves the encoded audio packets and does not normalize or amplify them.