[Libav-user] libav-API Understanding Error Logs when decoding and encoding

[Aditya]

[mpeg @ 19140050] max_analyze_duration reached      //-- what causes this and
how do i prevent this?

Input #0, mpeg, from 'tv5.mpg':
  Duration: 00:02:58.72, start: 0.500000, bitrate: 4162 kb/s
    Stream #0.0[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s
    Stream #0.1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DA
R 4:3], 15000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Output #0, avi, to 'output.avi':
    Stream #0.0: Audio: mp2, 48000 Hz, 2 channels, 64 kb/s
    Stream #0.1: Video: mpeg4, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=2-31, 150
00 kb/s, 90k tbn, 50 tbc

[mpeg2video @ 1915FE30] ac-tex damaged at 33 22 //--what is ac-tex? how to
prevent damage or correct the damaged ac-tex ?
prevent its damage
[mpeg2video @ 1915FE30] Warning MVs not available //-- what are mv's  ?
[mpeg2video @ 1915FE30] concealing 90 DC, 90 AC, 90 MV errors //-- what exactly
is happening here ? 
[mpeg2video @ 1915FE30] Warning MVs not available
[mpeg2video @ 1915FE30] concealing 30 DC, 30 AC, 30 MV errors
[mpeg2video @ 1915FE30] 00 motion_type at 1 2
[mpeg2video @ 1915FE30] Warning MVs not available
[mpeg2video @ 1915FE30] concealing 90 DC, 90 AC, 90 MV errors

The encoded video comes out with decreased frames,duration and without an audio.