blocks|key|5146747|text|我强烈推荐ffmpeg。在Windows上，我发现this+site可以托管好的二进制文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5146748|entityMap|0|LINK|mutability|MUTABLE|url|https://ffmpeg.zeranoe.com/builds/^0|P|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I strongly recommend ffmpeg. On Windows, I have found <a href="https://ffmpeg.zeranoe.com/builds/" rel="nofollow noreferrer">this site</a> to host good binaries.

blocks|key|5146582|text|这取决于你想花多少钱。如果这是一个全新的(大多数没有资金)的想法，那么就走ffmpeg路线，但当你扩展并寻求改善质量时，考虑一种可以自动化的更专业的编码工具(Rhozet，Inlet，Digital+Rapids是3个选项)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5146583|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

kind of depends on how much you want to spend. if this is a brand new (and mostly unfunded) idea, then go the ffmpeg route, but as you scale and look to iprove the quality, consider one of the more professional encoding tools that can be automated (Rhozet, Inlet, Digital Rapids are 3 options).

blocks|key|2891395|text|ffmpeg可以做到这一点，它是一个使用libavcodec的命令行工具。可以处理大多数视频格式的转换。它的许可证是LPGL，如果它适合您的需要。您可以以编程方式将其作为单独的进程使用，或者如果您觉得自己是硬核，则可以自己使用libavcodec库直接编码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2891396|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

ffmpeg can do it, its a command-line tool that uses the libavcodec. Can handle conversion of most video formats. Its license is LPGL, if that suits your needs. You can utilize it as a separate process programmatically, or if you're feeling hardcore, you can use the libavcodec library yourself to encode directly.

blocks|key|2891449|text|当你想转码成Flv+(这可能是最适合web的)时，我使用下面这行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2891450|ffmpeg+-hq+-y+-i+$directory/$file+-r+20+-s+300x200+-deinterlace+-ar+22050+$directory/$file.flv+1>/dev/null+2>/dev/null|code-block|syntax|javascript|2891451|当然，它在linux下工作得很好:-)。|2891452|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

When you want to transcode to Flv (which is probably the best for the web) then I use this line:

<pre><code>ffmpeg -hq -y -i $directory/$file -r 20 -s 300x200 -deinterlace -ar 22050 $directory/$file.flv 1&gt;/dev/null 2&gt;/dev/null
</code></pre>

It works very well, under linux of course :-).

blocks|key|2891671|text|如果你正在寻找GPL的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2891672|关于音频方面的问题，可以试试sox.非常强大！它做了很多事情！它包含在大多数linux发行版中。|offset|length|2891673|还有著名的用于mp3音频编码的LAME。|2891674|在视频方面，mencoder令人印象深刻！它是mplayer包的一部分。它将处理大多数视频格式的转换。比我想象中存在的要多得多。(有关文档，请参阅Chapter+9.+Basic+usage+of+MEncoder和Chapter+10.+Encoding+with+MEncoder。)|2891675|它在某种程度上更多地限制了它可以创建的内容。但它确实支持mpeg4、mpeg2、dvd-mpeg、flv和许多其他格式。(虽然我自己还没有尝试过flv，但谷歌显示其他人也在使用它。)|2891676|我做过像jpeg+%2B+sound+->+mpeg4电影这样的事情：|2891677|nice+%2B20+$MENCODER+mf://${JPEGFILE}++-mf+w=720:h=480:fps=1/${SOUNDLENGTH}:type=jpeg+-audiofile+${SOUNDFILE}+-ovc+lavc+-oac+lavc+-lavcopts+vcodec=mpeg4+-ofps+30000/1001+-o+${MENU_MPG}|code-block|syntax|javascript|2891678|或者将任意格式的视频转码为dvd兼容的mpeg：|2891679|nice+%2B20+$MENCODER+-edl+${EDL}+-ovc+lavc+-oac+lavc+-lavcopts+vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=${VBITRATE}:keyint=18:acodec=ac3:abitrate=192:aspect=4/3:trell:mbd=2:dia=4:cmp=3:precmp=3:ildctcmp=3:subcmp=3:mbcmp=3:cbp:mv0:dc=10+-of+mpeg+-mpegopts+format=dvd+-vf+scale=720:480,harddup+-srate+48000+-af+lavcresample=48000+-ofps+30000/1001+-o+./${INFILE}.reformatted++${FILEPATH}|2891680|-edl/-edlout+Edit+Decision+Lists用于剪切我想要的视频部分。|2891681|对于DVD-mpeg-video，${VBITRATE}通常为5000。但是，如果你搞错了一点，你可以把更多的视频压缩到dvd上。假设你能容忍这些神器。|2891682|scale=720:480，硬性升级--我的and播放器的刻度有点小问题，为了解决我的"el+cheapo“播放器上的音视频不同步问题，硬性升级了。|2891683|(为了在不能处理4x3视频的宽屏播放器上播放，我使用了像"aspect=16/9"，"-vf+scale=560:480，expand=720:480，harddup“这样的错误。但通常情况下，您不希望浪费编码黑条的位。)|2891684|到目前为止，这不是mencoder最有效的选项集！运行它可能会很耗时。但我有其他的目标...|2891685|entityMap|0|LINK|mutability|MUTABLE|url|http://sox.sourceforge.net/|1|http://lame.sourceforge.net/|2|http://www.mplayerhq.hu/|3|4|http://www.mplayerhq.hu/DOCS/HTML/en/mencoder.html|5|http://www.mplayerhq.hu/DOCS/HTML/en/encoding-guide.html|6^0|0|E|4|0|0|F|4|1|0|6|8|2|N|7|3|21|Y|4|30|Y|5|0|0|0|0|0|0|0|0|0|0|9|8|6|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1P|8|@]|9|@$D|1Q|E|1R|1|1S]]|A|$]]|$1|F|3|G|5|6|7|1T|8|@]|9|@$D|1U|E|1V|1|1W]]|A|$]]|$1|H|3|I|5|6|7|1X|8|@]|9|@$D|1Y|E|1Z|1|20]|$D|21|E|22|1|23]|$D|24|E|25|1|26]|$D|27|E|28|1|29]]|A|$]]|$1|J|3|K|5|6|7|2A|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|2B|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|2C|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|2D|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|2E|8|@]|9|@]|A|$Q|R]]|$1|W|3|X|5|6|7|2F|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|2G|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|2H|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|2I|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|2J|8|@]|9|@$D|2K|E|2L|1|2M]]|A|$]]|$1|16|3|-4|5|6|7|2N|8|@]|9|@]|A|$]]]|17|$18|$5|19|1A|1B|A|$1C|1D]]|1E|$5|19|1A|1B|A|$1C|1F]]|1G|$5|19|1A|1B|A|$1C|1H]]|1I|$5|19|1A|1B|A|$1C|1H]]|1J|$5|19|1A|1B|A|$1C|1K]]|1L|$5|19|1A|1B|A|$1C|1M]]|1N|$5|19|1A|1B|A|$1C|1H]]]]

If you are looking for GPL'ed stuff:

For audio mucking about, try <a href="http://sox.sourceforge.net/" rel="nofollow noreferrer">sox.</a> Very powerful! It does a lot! It's included in most linux distributions.

There is also the famous <a href="http://lame.sourceforge.net/" rel="nofollow noreferrer">LAME</a> for mp3 [audio] encoding.

For video, <a href="http://www.mplayerhq.hu" rel="nofollow noreferrer">mencoder</a> is impressive! It's part of the <a href="http://www.mplayerhq.hu" rel="nofollow noreferrer">mplayer</a> package. It will handle conversions from most video formats. Far more than I ever dreamed existed. (For documentation, see <a href="http://www.mplayerhq.hu/DOCS/HTML/en/mencoder.html" rel="nofollow noreferrer">Chapter 9. Basic usage of MEncoder</a> and <a href="http://www.mplayerhq.hu/DOCS/HTML/en/encoding-guide.html" rel="nofollow noreferrer">Chapter 10. Encoding with MEncoder</a>.)

It's somewhat more limited about what it can create. But it does support mpeg4, mpeg2, dvd-mpeg, flv, and many others. (While I haven't tried flv myself, google shows other folks are using it.)

I have done things like jpeg + sound -> mpeg4 movie:

<pre><code>nice +20 $MENCODER mf://${JPEGFILE} -mf w=720:h=480:fps=1/${SOUNDLENGTH}:type=jpeg -audiofile ${SOUNDFILE} -ovc lavc -oac lavc -lavcopts vcodec=mpeg4 -ofps 30000/1001 -o ${MENU_MPG}
</code></pre>

Or transcode arbitrarily formated video to dvd-compatible mpeg:

<pre><code>nice +20 $MENCODER -edl ${EDL} -ovc lavc -oac lavc -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=${VBITRATE}:keyint=18:acodec=ac3:abitrate=192:aspect=4/3:trell:mbd=2:dia=4:cmp=3:precmp=3:ildctcmp=3:subcmp=3:mbcmp=3:cbp:mv0:dc=10 -of mpeg -mpegopts format=dvd -vf scale=720:480,harddup -srate 48000 -af lavcresample=48000 -ofps 30000/1001 -o ./${INFILE}.reformatted ${FILEPATH}
</code></pre>

-edl/-edlout [Edit Decision Lists] are used to snip out just the video sections I want.

${VBITRATE} is normally 5000 for DVD-mpeg-video. But if you flub it a bit you can squeeze more video onto a dvd. Assuming you can tolerate the artifacts.

scale=720:480,harddup -- Little issue with the scale being wrong for my dvdplayer, and harddup to resolve a sound-video desync issue on my "el cheapo" player.

(To playback on a widescreen player that wouldn't handle 4x3 video, I've used atrocities like "aspect=16/9", "-vf scale=560:480,expand=720:480,harddup". But in general you don't want to waste bits encoding black-bars.)

This is not the most efficient set of options to <a href="http://www.mplayerhq.hu" rel="nofollow noreferrer">mencoder</a> by far! It can be time consuming to run. But I had other goals in mind...

blocks|key|5146364|text|请注意，ffmpeg的某些部分受GPL约束。我相信libpostproc模块是，如果我没记错的话，它被用在代码转换中。确保此许可证与您正在执行的操作兼容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5146365|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Do be aware that certain parts of ffmpeg are under GPL. I believe the libpostproc module is and if I recall correctly this is used in transcoding. Make sure this license is compatible with what you're doing.

blocks|key|703093|text|我会看一看Main+Concept的参考SDK：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|703094|http://www.mainconcept.com/site/developer-products-6/pc-based-sdks-20974/reference-sdk-21221/information-21243.html|offset|length|703095|它是为代码转换而构建的，因为它是一个授权的SDK，所以它没有任何围绕ffmpeg/libavcodec的法律问题。|703096|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|37|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I would take a look at Main Concept's Reference SDK:

<a href="http://www.mainconcept.com/site/developer-products-6/pc-based-sdks-20974/reference-sdk-21221/information-21243.html" rel="nofollow noreferrer">http://www.mainconcept.com/site/developer-products-6/pc-based-sdks-20974/reference-sdk-21221/information-21243.html</a>

It is built for transcoding and, since it is a licensed SDK it doesn't have any of the legal issues surrounding ffmpeg/libavcodec.

blocks|key|2891696|text|Rhozet+Carbon+Coder可以处理wide+range+of+formats，还可以使用插件修改视频(例如添加水印)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2891697|entityMap|0|LINK|mutability|MUTABLE|url|http://www.rhozet.com/carbon_coder.html|1|http://www.rhozet.com/rhozet_formatGuide.pdf^0|0|J|0|N|L|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

<a href="http://www.rhozet.com/carbon_coder.html" rel="nofollow noreferrer">Rhozet Carbon Coder</a> can handle a <a href="http://www.rhozet.com/rhozet_formatGuide.pdf" rel="nofollow noreferrer">wide range of formats</a> plus you can use plugins to alter the video (eg add a watermark)

What is the best way to transcode audio and video to show on the web? 

I need to do it programmatically. I'd like to do something like YouTube or Google Video where users can upload whatever format they want, and I encode it to flv, mp3, and/or mp4. I could do it on our server, but I would rather use an EC2 instance or even a web service. We have a Windows 2008 server.

Transcoding audio and video

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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对音频和视频进行转码以便在web上显示的最佳方法是什么？我需要通过编程来完成这项工作。我想做一些像YouTube或谷歌视频这样的事情，用户可以上传他们想要的任何格式，然后我将其编码为flv、mp3和/或mp4。我可以在我们的服务器上完成，但我更愿意使用EC2实例，甚至是web服务。我们有一台Windows 2008服务器。

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