Que fait Media Converter ?
Media Converter permet de convertir des données ou des fichiers dans le navigateur et présente clairement le résultat et ses limites. Fonctions vérifiées : WAV audio extraction, Capability-checked MP4 and WebM, Compatible-track remuxing, Resolution caps and hard cancellation.
When should you use this tool?
Use WAV extraction for an uncompressed audio copy, transcode when the target codec or dimensions must change, and remux to change compatible containers without re-encoding. A remux does not fix an unsupported playback codec and does not shrink video dimensions. Check the output in the application that will receive it.
Comment l’utiliser ?
- Choose a local media file, or load the two-second sample tone. Wait for the file and codec capability check.
- Select an enabled output operation and a video height cap for transcoding. Run Convert locally; Cancel terminates the Worker.
- Preview and download the result, then check it in your target player. Changing the file or settings clears the previous result.
Exemple réel d’entrée et de sortie
Export a two-second local sample as WAV
Entrée
Sample tone: 2 seconds, 440 Hz, mono PCM, 48 kHz.
Operation: WAV audio extraction.Sortie
A downloadable WAV file with a 48 kHz, 16-bit mono PCM audio track, about 188 KiB.The sample is generated in this tab without a microphone. WAV uses built-in PCM processing. For compressed inputs, the original codec must also be decodable; video conversion depends on available encoders.
Erreurs fréquentes et corrections
| Symptôme | Cause probable | Correction |
|---|---|---|
| MP4 or another operation is unavailable. | The file codec cannot be decoded or the requested encoder is unavailable. Container support alone does not guarantee encoding support. | Choose an enabled operation. Firefox may lack AAC encoding even when H.264 is available. WAV extraction or compatible remuxing may still work; the tool rejects accidental track loss. |
| The file is rejected or processing stops. | The media is encrypted, damaged, unsupported, or exceeds duration, dimension, frame, file, output or time budgets. | Use an unencrypted short mono/stereo file, shorten or resize it first, then recheck. No file is uploaded as a fallback. |
Supported behavior and limitations
Limite propre à cet outil : Inputs: local MP4/MOV/M4A, WebM/Matroska, WAV, MP3, Ogg, FLAC or AAC when their tracks are supported. Maximum 30 seconds; desktop 25 MiB, touch devices 10 MiB. Input video: 1920 × 1080 or rotated equivalent (touch 1280 × 720), 900 frames. Transcoded video: at most 1280 × 720, 30 fps (touch 854 × 480), never upscaled. Audio: 1–2 channels, 8–96 kHz; re-encoded audio is 48 kHz. Output budget is 25 MiB/10 MiB; inspection stops after 20 seconds and conversion after 90 seconds. Only primary video/audio tracks are used; subtitles and descriptive metadata are omitted. Remuxing preserves original codecs and dimensions; MP4 remuxing is limited to H.264/AAC. A browser preview may be unavailable even for a valid output. No MP3 encoder, HLS/URL import, DRM, 4K, arbitrary codec guarantee or server fallback. Physical-phone performance has not been validated; use small files on mobile.
Normes et références d’implémentation
- Mediabunny official repository (opens in a new tab)Version 1.61.4, MPL-2.0; the complete corresponding source archive and license are linked in the workspace. No optional codec plugins are included.
- Mediabunny formats and codec support (opens in a new tab)Separates container compatibility from native WebCodecs encoding/decoding. The tool checks the actual tracks and requested configuration.
Media Converter — FAQ
Is my input uploaded?
No. Processing happens in a browser Worker. Engine files load from this website; tool input, output, and filenames are not sent to a processing API.
Do I need an account or API key?
No account, API key, or backend processing service is needed.
How do I save a result?
Review the result, then use the Copy or Download control available for that output. Modifying input clears stale results.
What are the limits?
Inputs: local MP4/MOV/M4A, WebM/Matroska, WAV, MP3, Ogg, FLAC or AAC when their tracks are supported. Maximum 30 seconds; desktop 25 MiB, touch devices 10 MiB. Input video: 1920 × 1080 or rotated equivalent (touch 1280 × 720), 900 frames. Transcoded video: at most 1280 × 720, 30 fps (touch 854 × 480), never upscaled. Audio: 1–2 channels, 8–96 kHz; re-encoded audio is 48 kHz. Output budget is 25 MiB/10 MiB; inspection stops after 20 seconds and conversion after 90 seconds. Only primary video/audio tracks are used; subtitles and descriptive metadata are omitted. Remuxing preserves original codecs and dimensions; MP4 remuxing is limited to H.264/AAC. A browser preview may be unavailable even for a valid output. No MP3 encoder, HLS/URL import, DRM, 4K, arbitrary codec guarantee or server fallback. Physical-phone performance has not been validated; use small files on mobile.
Quelles modifications ?
Mise à jour substantielle : Media Converter: Added local processing, explicit size limits, cancellation, worked examples, error explanations, and downloadable results.