Y4M 转 M4A 转换器

A free Y4M to M4A 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。

使用方法

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
M4A 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 M4A
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

M4A

MPEG-4 Audio

只容纳音频的 MP4 容器格式，通常是 AAC，有时也是无损的 ALAC。这是 iTunes 抓取音乐时使用的格式，也是苹果设备期望的格式，对封面图片和标签有完善的支持。

开发者: Apple / MPEG
发布时间: 2001
扩展名: .m4a
MIME 类型: audio/mp4
压缩方式: 有损或无损

转换前值得了解

Y4M is lossless, and M4A can be either. At typical quality settings this lands on lossy and trades size for some quality loss. Keep Y4M as a source if you may need a higher-detail version later.
这次转换只会保留音轨 —— 画面会被完全丢弃。

FAQ

关于 Y4M 转 M4A 的常见问题

这个 Y4M 转 M4A 转换器是免费的吗？

是的。在这里把 Y4M 转换为 M4A 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 M4A 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 M4A 会损失质量吗？

It depends on your selected settings and codec path. Many engines can write either lossy or lossless output for M4A, so you can usually increase quality if this file is your final version.

可以一次把多个 Y4M 文件转换为 M4A 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 M4A 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 M4A

此处共有 41 种格式可以转换为 M4A。

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。