FFMPEG wmv转换为flv

Question

任何使用ffmpeg的人

我有一个相当简单的wmv导出的用户从电影制作人的标准输出，并希望转换为.flv使用

Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\MediaAdmin\bin\Debug\Movies\Jab -i "E:\Jab Core 4 Recounters.wmv“-vcodec flv "C:\Net Jab Core 4 Recounters.flv”-ar 44100

我收到的输出/错误是

FFmpeg version 0.5, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilt
er --enable-avfilter-lavf --enable-pthreads --enable-avisynth --enable-libfaac -
-enable-libfaad --enable-libmp3lame --enable-libspeex --enable-libtheora --enabl
e-libvorbis --enable-libxvid --enable-libx264 --enable-memalign-hack
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 0 / 52.20. 0
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libavfilter    0. 4. 0 /  0. 4. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Mar 16 2009 16:09:18, gcc: 4.2.4 [Sherpya]
[wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0

Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
/1) -> 30.00 (30/1)
Input #0, asf, from 'E:\Jab Core 4 Recounters.wmv':
  Duration: 00:01:55.99, start: 5.000000, bitrate: 813 kb/s
    Stream #0.0: Audio: wmav2, 48000 Hz, stereo, s16, 192 kb/s
    Stream #0.1: Video: wmv3, yuv420p, 640x480, 586 kb/s, 30 tbr, 1k tbn, 1k tbc

Output #0, flv, to 'C:\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\Me
diaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv':
    Stream #0.0: Video: flv, yuv420p, 640x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc

    Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, s16, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
  Stream #0.0 -> #0.1
[wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
[libmp3lame @ 0x1c0d8d0]flv does not support that sample rate, choose from (4410
0, 22050, 11025).
Could not write header for output file #0 (incorrect codec parameters ?)

我在第一次出现错误时添加了-ar开关

我在该文件上的编解码器信息如下

General
Complete name                    : E:\Jab Core 4 Recounters.wmv
Format                           : Windows Media
File size                        : 11.3 MiB
Duration                         : 2mn 0s
Overall bit rate mode            : Variable
Overall bit rate                 : 780 Kbps
Maximum Overall bit rate         : 949 Kbps
Encoded date                     : UTC 2009-03-07 07:02:41.121
Writing application              :  6.0.6000.16386 / Windows Movie Maker
Application                      : Windows Movie Maker 6.0.6000.16386

Video
ID                               : 2
Format                           : VC-1
Format profile                   : MP@ML
Codec ID                         : WMV3
Codec ID/Info                    : Windows Media Video 9
Codec ID/Hint                    : WMV3
Duration                         : 2mn 0s
Bit rate mode                    : Variable
Bit rate                         : 587 Kbps
Width                            : 640 pixels
Height                           : 480 pixels
Display aspect ratio             : 4/3
Frame rate                       : 30.000 fps
Resolution                       : 24 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.064
Stream size                      : 8.46 MiB (75%)
Language                         : en-us

Audio
ID                               : 1
Format                           : WMA2
Format profile                   : L3
Codec ID                         : 161
Codec ID/Info                    : Windows Media Audio 2
Description of the codec         : Windows Media Audio 9.2 - VBR Quality 90, 48 kHz, stereo 1-pass VBR
Duration                         : 2mn 0s
Bit rate mode                    : Variable
Bit rate                         : 186 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 48.0 KHz
Resolution                       : 16 bits
Stream size                      : 2.68 MiB (24%)
Language                         : en-us

我看到很多人对这个问题有这样的解决方案或原因

任何想法都将是有益的，提前感谢

Answer 1

对于可能的小帮助，您可以看到源音频的频率是48 the，flv拒绝了它。显然，ffmpeg忽略了你的-ar标志。你的第一步需要做的是重新采样音频...您可以尝试将代码转换为某种中间格式以转换采样率，然后将其转换为flv。

Answer 2

在ffmpeg中，选项必须作为它们相关的输入文件的前缀。将-ar 44100移到前面，它就可以工作了。

Answer 3

我知道问题已经有了答案，但我想它可能会对某些人有所帮助。如果您遇到音频采样率问题，请使用以下命令

ffmpeg -i video.avi -ar 22050 video.flv

-i input file name
-ar audio sampling rate in Hz