Formats & codecs FFmix supports
FFmix reads what the bundled ffmpeg engine reads — the common containers and codecs you meet on a Mac — and exports the formats people actually need: MP4 (H.264/HEVC), MP3/AAC/WAV audio, GIF, and image frames. Everything runs locally, nothing is uploaded.
Video
| Video | Open / read | Export / write |
|---|---|---|
| Codecs | H.264 · HEVC/H.265 · VP9 · AV1 · VP8 · MPEG-4 · ProRes · MJPEG | H.264 and HEVC/H.265 — hardware-accelerated via VideoToolbox |
| Containers | MP4 · MOV · MKV · WebM · AVI · FLV · TS · M4V · 3GP | MP4 |
Audio
| Audio | Open / read | Export / write |
|---|---|---|
| Codecs | AAC · MP3 · AC-3 · Opus · Vorbis · FLAC · ALAC · PCM | MP3 · AAC · WAV (PCM) |
Subtitles, GIF & images
| Type | What FFmix does |
|---|---|
| SRT / ASS subtitles | Burn into the picture (libass), or keep an SRT sidecar |
| Transcription | Generate an SRT locally with Whisper — on-device, audio never uploaded |
| Animated GIF | Export a clean, palette-based GIF from any video clip |
| Still frames | Export JPG / PNG frames — a cover frame, or one per second |
| Images in | Drop in JPG / PNG / HEIC images as task input |
Why exports are H.264 or HEVC
On the Mac App Store build, FFmix encodes with Apple’s VideoToolbox hardware encoders, which means H.264 and HEVC/H.265 exports that are fast and easy on the battery. The bundled engine is the LGPL build of ffmpeg, so it doesn’t include the GPL x264/x265 encoders — but these two output codecs cover virtually every device, browser, editor and platform, which is exactly what you want from a converted file.
The whole range is still open to you: drop in a VP9, AV1 or ProRes source and FFmix decodes it, then writes a universally playable MP4. Expand Advanced on any task to see the exact command first.
If a file won’t open
Most “unsupported” files are just an unusual source codec. Run Convert → MP4 on the file first — that normalises it to H.264/AAC — then run your real task (compress, GIF, extract audio) on the result. Because the engine is bundled, all of this works offline.
FAQ
What formats can FFmix export to?
Video: MP4 with H.264 or HEVC/H.265, hardware-accelerated on Apple Silicon. Audio: MP3, AAC, or WAV. Plus animated GIFs and JPG/PNG still frames. Conversions land in widely compatible files by default.
Can FFmix open my file?
It reads what the bundled ffmpeg engine reads, which covers almost every common container and codec — MP4, MOV, MKV, WebM, AVI and more. If a file refuses to open, run Convert → MP4 on it first, then your task.
Does FFmix support HEVC / H.265?
Yes — it both decodes and exports HEVC, using Apple’s VideoToolbox encoder. Exports are tagged hvc1 so QuickTime and the Photos app play them correctly.
Can it export ProRes or AV1?
FFmix can decode ProRes and AV1 sources, but it exports H.264 and HEVC rather than ProRes or AV1 — those two codecs cover virtually all playback and sharing needs while keeping files small.
Free local tasks · no account · the command you see is the command that runs.