Do I need to install anything?

Yes. This tool generates an FFmpeg command you run locally. Install FFmpeg from ffmpeg.org (Windows, macOS, Linux). The conversion happens on your machine — no files are uploaded here.

What is CRF and what value should I use?

CRF (Constant Rate Factor) controls quality. For H.264, 18 is near-lossless, 23 is default (good balance), 28 is smaller but noticeably softer. For H.265, use 24–28. Lower = better quality, larger file.

When should I use "Copy stream" instead of re-encoding?

Use Copy (stream copy) when the FLV already contains H.264 video and AAC audio. Stream copy is instant and lossless because it just rewraps the data. If the FLV uses older codecs (VP6, Sorenson), you must re-encode.

Why choose MOV over MP4?

MOV is preferred when working with Apple tools (Final Cut Pro, iMovie, QuickTime Player) or when you need ProRes encoding. MP4 offers broader cross-platform support. Both use the same H.264/H.265 codecs inside.

Can I convert multiple files at once?

Yes. Use a shell loop: on Linux/macOS run `for f in *.flv; do ffmpeg -i "$f" "${f%.flv}.mov"; done`. On Windows PowerShell: `Get-ChildItem *.flv | ForEach-Object { ffmpeg -i $_.Name "$($_.BaseName).mov" }`.

FLV to MOV Converter

Generate the exact FFmpeg command to convert FLV video files to MOV format with your chosen codec and quality settings.

Conversion Options

Input FLV filename

Output MOV filename

Video codec

Quality (CRF) — lower = higher quality

0 — lossless 23 — default 51 — worst

Encoding speed preset

Audio codec

FFmpeg Command

ffmpeg -i input.flv -c:v libx264 -crf 23 -preset medium -c:a aac output.mov

Command Breakdown

Tips

Install FFmpeg free at ffmpeg.org. On macOS: brew install ffmpeg.
Use Copy stream if your FLV already contains H.264 + AAC — conversion is instant and lossless.
Check the codec inside your FLV first: ffprobe input.flv
H.265 saves ~40% file size vs H.264 at the same visual quality, but encoding takes 2–4× longer.

Copied!

Summary

FLV (Flash Video) is a legacy container format once widely used for web streaming. MOV is Apple's QuickTime container, broadly supported on macOS, iOS, and professional editing software. This tool generates the correct FFmpeg command to convert any FLV file to MOV, letting you choose video codec, audio codec, and quality level without memorizing FFmpeg flags.

How it works

Enter your input FLV filename (e.g. clip.flv).
Choose a video codec: H.264 (most compatible), H.265 (smaller file), or copy the stream without re-encoding.
Set a quality preset — lower CRF numbers mean higher quality and larger files.
Choose an audio codec: AAC (recommended) or copy original audio.
Click "Generate Command" to see the ready-to-run FFmpeg command.
Copy the command and run it in your terminal where FFmpeg is installed.

Use cases

Convert old Flash video archives to a modern, editable format.
Prepare FLV recordings from screen-capture tools for macOS editing.
Re-encode web-downloaded FLV clips for use in Final Cut Pro or iMovie.
Batch-convert legacy FLV files on a server using generated commands.
Preserve original quality by stream-copying instead of re-encoding.
Reduce file size by converting FLV to H.265 inside a MOV container.

Frequently Asked Questions

Last updated: 2026-06-13 · Reviewed by Nham Vu