ffmpeg将wmv转换为flv flv转wmv格式转换器-爱华网

应该说ffmpeg是一个很强大的视频转换工具，【另外一个Mencoder据说也不错】

命令看起来很简单，比如
ffmpeg将wmv转换为flv flv转wmv格式转换器

将一个文件转换为flv文件，命令如下：
ffmpeg -isrc.wmv -y output.flv
出现error错误：
[adpcm_swf @0x2104a20]Sample rate must be 11025, 22050 or44100
Error while opening codecfor output stream #0.1 - maybe incorrect parameters such asbit_rate, rate, width or height

这里需要加一个参数
ffmpeg -i src.wmv -ar 11025output.flv

我是从下面文章中获得了答案，由于对视频的一些知识不是很懂，暂时只能照葫芦画瓢
内容如下：

First I tried this:

ffmpeg -i input.avi output.flv

and got this error:

Input #0, avi, from 'input.avi':
 Duration: 00:00:27.8, start: 0.000000, bitrate: 4128 kb/s
 Stream #0.0: Video: mjpeg, yuvj422p, 640x480 [PAR 0:1 DAR 0:1], 15.00 tb(r)
 Stream #0.1: Audio: pcm_s16le, 7875 Hz, mono, 126 kb/s
Output #0, flv, to 'output.flv':
 Stream #0.0: Video: flv, yuv420p, 640x480 [PAR 0:1 DAR 0:1], q=2-31, 200 kb/s, 15.00 tb(c)
 Stream #0.1: Audio: adpcm_swf, 7875 Hz, mono, 64 kb/s
Stream mapping:
 Stream #0.0 -> #0.0
 Stream #0.1 -> #0.1
[adpcm_swf @ 0x7f0f3be6ba00]Sample rate must be 11025, 22050 or 44100
Error while opening codec for output stream #0.1 - maybe incorrect parameters such 
as bit_rate, rate, width or height

Then I tried this:

ffmpeg -i input.avi -vcodec copy -acodec pcm_s16le output.flv

and got this error:

[pcm_s16le @ 0x7f058dfcba00]flv does not support that sample rate, choose from (44100, 22050, 11025).
Could not write header for output file #0 (incorrect codec parameters ?)

Then i tried this

ffmpeg -i input.avi -vcodec copy -acodec pcm_s16le -ar 44100 output.flv

and only got audio, no video in output file.

Then this:
```
ffmpeg -i input.avi -ar 44100 output.flv
```
and finally got something that works, however the quality wasn'tgreat.
To increase quality, use the -sameq argument (same quality assource) This doubled the file size but the flv was much higherquality.
```
ffmpeg -i input.avi -sameq -ar 44100 output.flv
```