Speech, short song
- Input
- 5 min, MP3 128 kbps
- Expected output
- 4,8 MB
128,000 bits/s x 300 s / 8 = 4,800,000 bytes.
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convert video to mp3 online
Drop the video, pick MP3 and the bitrate and click Extract. The tool decodes the audio track in your browser, in pieces, and writes the MP3 directly, so even long videos do not need gigabytes of memory.
128,000 bits/s x 300 s / 8 = 4,800,000 bytes.
192,000 x 240 / 8 = 5,760,000 bytes.
320,000 x 240 / 8 = 9,600,000 bytes.
128,000 x 3600 / 8 = 57,600,000 bytes.
44,100 x 2 channels x 2 bytes x 240 s, plus a 44-byte header.
Choose the video and click Extract. Reading, decoding and MP3 encoding all run in your browser, in a Worker, with no upload. The file only sits in your device's memory while it is processed.
No. The tool runs in the browser and nothing is sent to a server. It works best in recent browsers; M4A only appears when the browser has an AAC encoder.
128 kbps. Speech gains nothing above that and the lecture hour comes to 57.6 MB. In mono, the file keeps the same bitrate with a single channel, useful when the recording is already mono.
Yes, with an extra 0.03 to 0.05 second the MP3 encoder itself adds at the end. Pauses and gaps in the track become silence, so the audio does not end up shorter than the video.
There is no fixed limit: the video is read in parts and the audio is processed in pieces. What limits you is decoding time and the memory to hold the output file.
Extraction runs in your browser. The video is not sent to any server.