data-compression - 视频和音频文件

Question

复制： 音频和视频文件压缩器

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我想将 wmv 2mb 或更大的文件压缩为移动设备的 3gp 250kb 文件。

任何伟大的视频或音频压缩器？

Answer 1

我是ffmpeg的忠实粉丝。找出您的移动设备需要的编解码器和分辨率。如果幸运的话，将支持 H.264。

Answer 2

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.