M4V 转 DV 转换器
A free M4V to DV converter for iTunes Video files. Browser-based pairs here usually run in this tab, with no file upload.
将你的 M4V 文件拖放到这里
or 浏览你的设备 · 粘贴快捷键 Ctrl+V
Accepts .m4v files. You can queue several files; each is processed one after another on your own device.
你的文件永远不会离开这台设备 —— 没有上传，也就没有服务器可以从中删除它们。
- 01
添加你的 M4V 文件
将文件拖放到上方的方框里，或点击浏览选择。它们会直接从磁盘读取 —— 不会发送到任何地方。
- 02
检查设置
DV is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
下载你的 DV
点击转换，等待该行处理完成。转换多个文件时，可以将它们全部打包为一个 ZIP 一次性下载。
M4V
iTunes Video苹果为 iTunes 使用的 MP4 变体格式，偶尔会带有 FairPlay DRM 保护。没有 DRM 保护的文件实际上等同于 MP4；这个扩展名主要是告诉苹果的软件应该如何处理它。
- 开发者
- Apple
- 发布时间
- 2005
- 扩展名
- .m4v
- MIME 类型
- video/x-m4v
- 压缩方式
- 有损
DV
Digital VideoMiniDV 摄像机使用的帧内编码格式，以固定的 25Mbit/s 独立记录每一帧。非常适合剪辑，但存储起来相当浪费空间。
- 开发者
- IEC consortium
- 发布时间
- 1995
- 扩展名
- .dv, .dif
- MIME 类型
- video/x-dv
- 压缩方式
- 有损
- Both M4V and DV are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
关于 M4V 转 DV 的常见问题
这个 M4V 转 DV 转换器是免费的吗？
是的。在这里把 M4V 转换为 DV 完全免费，无需账号、没有水印、也没有每日次数限制。处理在你自己的设备上完成，因此不存在需要转嫁给你的服务器成本。
我的 M4V 文件会被上传到任何地方吗？
For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
M4V 转 DV 有文件大小限制吗？
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
把 M4V 转换为 DV 会损失质量吗？
DV is a lossy format, so some detail is discarded when it is encoded. At the default quality setting the change is often not visually obvious; keep your original M4V file if you might need it again.
可以一次把多个 M4V 文件转换为 DV 吗？
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
M4V 转 DV 能在手机、Mac 或 Chromebook 上使用吗？
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
将其他格式转换为 DV
此处共有 21 种格式可以转换为 DV。
将 M4V 转换为其他格式
一个 M4V 文件可以转换为以下任意一种格式。