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cnblogs/dcrenl/ffmpeg参数使用说明1.html
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2024-09-24 12:43:01 +08:00

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<div id="sina_keyword_ad_area2" class="articalContent ">
<p ALIGN="left">
1.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
ffmpeg.exe -i F:闪客之家闪客之歌.mp3 -ab 56 -ar 22050 -b 500 -r 15 -s
320x240 f:11.flv</P>
<p ALIGN="left">
2.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
ffmpeg -i F:1.wmv -ab 56 -ar 22050 -b 500 -r 15 -s 320x240
f:test.flv &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
3.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
使用-ss参数 作用（time_off set the start time offset），可以从指定时间点开始转换任务。如:
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
4.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
转换文件格式的同时抓缩微图： &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
5.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
ffmpeg -i "test.avi" -y -f image2 -ss 8 -t 0.001 -s 350x240
'test.jpg'&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
6.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
对已有flv抓图： &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
7.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
ffmpeg -i "test.flv" -y -f image2 -ss 8 -t 0.001 -s 350x240
'test.jpg'&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
8.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
-ss后跟的时间单位为秒 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
9.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
Ffmpeg转换命令 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">10.&nbsp;<wbr> ffmpeg -y -i test.mpeg
-bitexact -vcodec h263 -b 128 -r 15 -s 176x144 -acodec aac -ac 2
-ar 22500 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">11.&nbsp;<wbr> -ab 24 -f 3gp test.3gp
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">12.&nbsp;<wbr> 或者
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">13.&nbsp;<wbr> ffmpeg -y -i test.mpeg -ac 1
-acodec amr_nb -ar 8000 -s 176x144 -b 128 -r 15 test.3gp
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">14.&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">15.&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">16.&nbsp;<wbr> ffmpeg参数设定解说
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">17.&nbsp;<wbr> -bitexact 使用标准比特率
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">18.&nbsp;<wbr> -vcodec xvid 使用xvid压缩
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">19.&nbsp;<wbr> -s 320x240 指定分辨率
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">20.&nbsp;<wbr> -r 29.97
桢速率（可以改，确认非标准桢率会导致音画不同步，所以只能设定为15或者29.97）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">21.&nbsp;<wbr> 画面部分，选其一
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">22.&nbsp;<wbr> -b
&lt;比特率&gt;
指定压缩比特率，似乎ffmpeg是自动VBR的，指定了就大概是平均比特率，比如768，1500这样的
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">23.&nbsp;<wbr> 就是原来默认项目中有的
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">24.&nbsp;<wbr> -qscale
&lt;数值&gt;
以&lt;数值&gt;质量为基础的VBR，取值0.01-255，约小质量越好
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">25.&nbsp;<wbr> -qmin
&lt;数值&gt; 设定最小质量，与-qmax（设定最大质量）共用，比如-qmin
10 -qmax 31 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">26.&nbsp;<wbr> -sameq 使用和源同样的质量
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">27.&nbsp;<wbr> 声音部分
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">28.&nbsp;<wbr> -acodec aac 设定声音编码
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">29.&nbsp;<wbr> -ac
&lt;数值&gt;
设定声道数，1就是单声道，2就是立体声，转换单声道的TVrip可以用1（节省一半容量），高品质
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">30.&nbsp;<wbr> 的DVDrip就可以用2
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">31.&nbsp;<wbr> -ar
&lt;采样率&gt; 设定声音采样率，PSP只认24000
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">32.&nbsp;<wbr> -ab
&lt;比特率&gt;
设定声音比特率，前面-ac设为立体声时要以一半比特率来设置，比如192kbps的就设成96，转换
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">33.&nbsp;<wbr>
君默认比特率都较小，要听到较高品质声音的话建议设到160kbps（80）以上
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">34.&nbsp;<wbr> -vol
&lt;百分比&gt;
设定音量，某些DVDrip的AC3轨音量极小，转换时可以用这个提高音量，比如200就是原来的2倍
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">35.&nbsp;<wbr>
这样，要得到一个高画质音质低容量的MP4的话，首先画面最好不要用固定比特率，而用VBR参数让程序自己去
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">36.&nbsp;<wbr>
判断，而音质参数可以在原来的基础上提升一点，听起来要舒服很多，也不会太大（看情况调整
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">37.&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">38.&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">39.&nbsp;<wbr> 例子：ffmpeg -y -i "1.avi"
-title "Test" -vcodec xvid -s 368x208 -r 29.97 - b 1500 -acodec aac
-ac 2 -ar 24000 -ab 128 -vol 200 -f psp -muxvb 768
"1.***"&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">40.&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">41.&nbsp;<wbr>
解释：以上命令可以在Dos命令行中输入，也可以创建到批处理文件中运行。不过，前提是：要在ffmpeg所在的目录中执行（转换君所在目录下面的cores子目录）。
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">42.&nbsp;<wbr> 参数：
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">43.&nbsp;<wbr>
-y（覆盖输出文件，即如果1.***文件已经存在的话，不经提示就覆盖掉了）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">44.&nbsp;<wbr> -i
"1.avi"（输入文件是和ffmpeg在同一目录下的1.avi文件，可以自己加路径，改名字）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">45.&nbsp;<wbr> -title "Test"（在PSP中显示的影片的标题）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">46.&nbsp;<wbr> -vcodec
xvid（使用XVID编码压缩视频，不能改的） &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">47.&nbsp;<wbr> -s
368x208（输出的分辨率为368x208，注意片源一定要是16:9的不然会变形）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">48.&nbsp;<wbr> -r 29.97（帧数，一般就用这个吧）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">49.&nbsp;<wbr> -b 1500（视频数据流量，用-b
xxxx的指令则使用固定码率，数字随便改，1500以上没效果；还可以用动态码率如：-qscale 4和-qscale
6，4的质量比6高） &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">50.&nbsp;<wbr> -acodec aac（音频编码用AAC）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">51.&nbsp;<wbr> -ac 2（声道数1或2）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">52.&nbsp;<wbr> -ar
24000（声音的采样频率，好像PSP只能支持24000Hz）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">53.&nbsp;<wbr> -ab
128（音频数据流量，一般选择32、64、96、128）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">54.&nbsp;<wbr> -vol 200（200%的音量，自己改）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">55.&nbsp;<wbr> -f psp（输出psp专用格式）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">56.&nbsp;<wbr> -muxvb
768（好像是给PSP机器识别的码率，一般选择384、512和768，我改成1500，PSP就说文件损坏了）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">57.&nbsp;<wbr> "1.***"（输出文件名，也可以加路径改文件名）
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">58.&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">59.&nbsp;<wbr> P.S.
版主机器强劲的话，可以多开几个批处理文件，让它们并行处理。
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">60.&nbsp;<wbr> E:ffmpeg.exe -i I:1.wmv -b
360 -r 25 -s 320x240 -hq -deinterlace -ab 56 -ar 22050 -ac 1
D:2.flv&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
--------------------------------------------------------------------------------------------------------------------------------------</P>
<p ALIGN="left">Txt代码 <a TITLE="复制代码" HREF="http://www.javaeye.com/topic/333994"></A></P>
<p ALIGN="left">
1.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
%1\ffmpeg -i %2 -y -ab 56 -ar 22050 -b 500 -r 15 -s 320*240
%3&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
2.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
exit&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">%1\ffmpeg -i %2 -y -ab 56 -ar 22050 -b 500 -r 15 -s
320*240 %3 exit</P>
<p ALIGN="left">******************</P>
<p ALIGN="left">%1为ffmpeg存放目录</P>
<p ALIGN="left">%2为需要转换的文件路径</P>
<p ALIGN="left">%3为FLV文件输出目录</P>
<p ALIGN="left">******************</P>
<p ALIGN="left">同样需要注意的是bat文件存放的路径不能包含空格</P>
<p ALIGN="left">也可以对视频进行截取缩略图哦:)</P>
<p ALIGN="left">Txt代码 <a TITLE="复制代码" HREF="http://www.javaeye.com/topic/333994"></A></P>
<p ALIGN="left">
1.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
【转换文件格式的同时抓缩微图】 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
2.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
ffmpeg -i "test.avi" -y -f image2 -ss 8 -t 0.001 -s 350x240
"test.jpg"&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
3.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
4.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
【对已有flv抓图】 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
5.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
ffmpeg -i "test.flv" -y -f image2 -ss 8 -t 0.001 -s 350x240
"test.jpg"&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
6.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
&nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
7.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
**************** &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
8.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
-ss后跟的时间单位为秒 &nbsp;<wbr>&nbsp;<wbr></P>
<p ALIGN="left">
9.&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>&nbsp;<wbr>
****************&nbsp;<wbr>&nbsp;<wbr></P>
</div>
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