ffmpeg运行过程中，提升下面的错误，请问这是什么原因导致的啊？

[xinyao63]

Input #0, mpeg, from 'D:\a.mpg':
Duration: 00:17:23.32, start: 0.640000, bitrate: 2334 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv), 480x576 [SAR 8:5
DAR 4:3], max. 2516 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s
[mpeg2video @ 0003c140] ac-tex damaged at 10 11
[mpeg2video @ 0003c140] Warning MVs not available
[mpeg2video @ 0003c140] concealing 30 DC, 30 AC, 30 MV errors in P frame
[mpeg2video @ 0003c140] ac-tex damaged at 4 19
[mpeg2video @ 0003c140] Warning MVs not available
[mpeg2video @ 0003c140] concealing 60 DC, 60 AC, 60 MV errors in P frame