视频和音频文件
Duplicate: audio and video file compressor
I would like to compress a wmv 2mb or larger file to 3gp 250kb file for mobile devices.
any great compressors for video or audio?
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我是 ffmpeg 的忠实粉丝。 了解您的移动设备需要什么编解码器和分辨率。 如果幸运的话，将支持 H.264。
I'm a huge fan of ffmpeg. Find out what codec and resolution your mobile device wants. If you're lucky, H.264 will be supported.
你在这里可能会遇到一些麻烦。 WMV 是一个容器，而不是编解码器，因此我们无法具体说明我们正在处理的压缩级别以及需要在何处进行更改，但在不做出巨大妥协的情况下可能很难获得如此显着的文件大小减小，就像将视频的分辨率降低几个数量级一样。 这些妥协对于移动查看来说可能是可以接受的，但不能保证您能够减小文件大小，特别是如果您的文件采用 H.264 或 VC-1 等现代编解码器进行编码。
我的第一条建议是尝试找到一个好的类似向导的转码器，上面有一个漂亮的非开发人员界面等。视频压缩是一项艰巨的工作，它背后的强大工具以及这些类似向导的工具用于实际执行工作的应用程序非常复杂，需要大量练习和调整才能正确，并且通常仅限于命令行。 例如，如果您的移动设备供应商提供这些实用程序，那么使用它们会更好。
如果您无法找到这样的实用程序，请花大量时间查看 mencoder 和 ffmpeg 的手册页和 IRC 房间。 这本身并不困难，只是需要大量的研究和阅读才能获得可接受的输出，特别是当您追求您提到的减少时。 祝你好运。
You might have some trouble here. WMV is a container, not a codec, so we can't tell specifically the level of compression we're dealing with and what needs to be changed where, but it may be difficult to get such a dramatic reduction in filesize without making huge compromises, like decreasing the resolution of the video by several orders of magnitude. These compromises may be acceptable for mobile viewing, but there's no guarantee you'll be able to get that filesize down, especially if your file is encoded in a modern codec like H.264 or VC-1.
My first piece of advice is to attempt to locate a good wizard-like transcoder, with a nice non-developer interface on it, etc. Video compression is intense work, and the power tools behind it, and the tools that these wizard-like applications use to actually perform their work, are very complex and take lots of practice and tweaking to get right, and are usually restricted to commandlines. If your mobile device's vendor provides these utilities, for instance, you'll be much better off using them.
If you aren't able to locate such a utility, godspeed and spend lots of time with mencoder and ffmpeg's man pages and IRC rooms. It's not difficult per se, it just takes a lot of study and reading to get acceptable output, especially when you're going after the reductions you've mentioned. Good luck.