Y4M 转 M4V 转换器
A free Y4M to M4V converter for YUV4MPEG2 files. Browser-based pairs here usually run in this tab, with no file upload.
将你的 Y4M 文件拖放到这里
or 浏览你的设备 · 粘贴快捷键 Ctrl+V
Accepts .y4m 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 Y4M 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
M4V 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 M4V
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。
Y4M
YUV4MPEG2在一个极小的文本头之后完全未经压缩的原始帧数据。用于编解码器测试和无损中间格式；文件体积极其庞大。
- 扩展名
- .y4m
- MIME 类型
- video/x-yuv4mpeg2
- 压缩方式
- 无压缩
- 规范
- 开放
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
- Y4M is lossless and M4V is lossy. This direction discards some information in the encode step. In practice, many files look identical at default settings, but this is a one-way loss. Keep the Y4M source if you might need a perfect copy later.
关于 Y4M 转 M4V 的常见问题
这个 Y4M 转 M4V 转换器是免费的吗？
是的。在这里把 Y4M 转换为 M4V 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 Y4M 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.
Y4M 转 M4V 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 Y4M 转换为 M4V 会损失质量吗？
M4V 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 Y4M file if you might need it again.
可以一次把多个 Y4M 文件转换为 M4V 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.
Y4M 转 M4V 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 M4V
此处共有 21 种格式可以转换为 M4V。
将 Y4M 转换为其他格式
一个 Y4M 文件可以转换为以下任意一种格式。