[FFmpeg-user] consult about ffmpeg can not deal with the downloaded YouTube video

[daisy.ren]

Hi,

I have downloaded some video from YouTube, and used  ffmpeg to transcode
them.
Some of them can be transcoded , others can not. but they can all be played
by video player.

when trascode the video, it gives the header info of the video as following:

Input #0, flv, from 'G:\test.flv':
duration: 00:05:18.1, strat: 0.000000, bitrate: N/A
 Stream #0.0: Video: 0x0007, 25.00 tb<r>
 Stream #0.1: Audio: 0x000a, 44100Hz, stereo

Output #0, au, to 'G:\test.au'
   Stream #0.0: Audio: pcm_s16be, 44100Hz, stereo, 1411 kb/s

Stream mapping：
   Stream #0.1 -> #0.0
Unsupported codec <id = 0> for input stream #0.1


the info of the video test.flv, the video and audio format are all ASCII,
 does this effect the reading of the video?
many video player can play the video, means they can read the header info.
So i want to know if ffmpeg can fix this or does the ASCII related to the
format, such as h.264, .acc and so on?


thanks in advance!


-- 
Best Regards
Jing