[FFmpeg-user] concat wmv files error

[yzf at yzf888.com]

When i concat some wmv files to a large file size < 1.4G  is playback ok.



ffmpeg -f concat -i "_list.txt" -y -c copy  "C:/Users/output.wmv"

ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Mar 28 2013 00:28:48 with gcc 4.8.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[wmv3 @ 000373c0] Extra data: 8 bits left, value: 0
[wmv3 @ 043789a0] Extra data: 8 bits left, value: 0
[concat @ 00039aa0] Estimating duration from bitrate, this may be inaccurate

Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, concat, from '_list.txt':


  Duration: N/A, start: 0.000000, bitrate: 2064 kb/s



    Stream #0:0: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 1280x720, 2000 kb/s, 30.33 fps, 29.97 tbr, 1k tbn, 1k tbc

    Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, stereo, fltp, 64 kb/s
Output #0, asf, to 'C:/Users/output.wmv':
  Metadata:
    WM/EncodingSettings: Lavf54.63.104
    Stream #0:0: Video: wmv3 (WMV3 / 0x33564D57), yuv420p, 1280x720, q=2-31, 2000 kb/s, 30.33 fps, 1k tbn, 1k tbc
    Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, stereo, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 5592 fps=0.0 q=-1.0 size=   54354kB time=00:03:06.55 bitrate=2386.8kbits/s   
frame=11278 fps=11276 q=-1.0 size=  106082kB time=00:06:16.27 bitrate=2309.5kbits/s   
frame=15244 fps=10151 q=-1.0 size=  157691kB time=00:08:28.60 bitrate=2539.9kbits/s   
frame=18790 fps=9384 q=-1.0 size=  203948kB time=00:10:26.92 bitrate=2665.0kbits/s   
frame=23781 fps=9504 q=-1.0 size=  254360kB time=00:13:13.46 bitrate=2626.1kbits/s   
frame=29325 fps=9766 q=-1.0 size=  301713kB time=00:16:18.44 bitrate=2526.1kbits/s   
frame=34635 fps=9888 q=-1.0 size=  357904kB time=00:19:15.62 bitrate=2537.1kbits/s   
frame=40722 fps=10173 q=-1.0 size=  417869kB time=00:22:38.72 bitrate=2519.4kbits/s   
frame=46164 fps=10251 q=-1.0 size=  460138kB time=00:25:40.30 bitrate=2447.2kbits/s   
frame=54558 fps=10904 q=-1.0 size=  519710kB time=00:30:20.38 bitrate=2338.8kbits/s   
frame=62121 fps=11288 q=-1.0 size=  567985kB time=00:34:32.74 bitrate=2244.8kbits/s   

frame=85171 fps=5372 q=-1.0 size=  733444kB time=00:47:21.84 bitrate=2114.3kbits/s   

frame=87099 fps=5201 q=-1.0 size=  750398kB time=00:48:26.17 bitrate=2115.2kbits/s   
Extra data: 8 bits left, value: 0
frame=87706 fps=5042 q=-1.0 size=  756854kB time=00:48:46.42 bitrate=2118.7kbits/s   
frame=88278 fps=4910 q=-1.0 size=  765569kB time=00:49:05.51 bitrate=2129.2kbits/s   
....
frame=105741 fps=3188 q=-1.0 size= 1066326kB time=00:58:48.19 bitrate=2475.9kbits/s   
frame=107106 fps=3195 q=-1.0 Lsize= 1085525kB time=00:59:33.77 bitrate=2488.3kbits/s   

video:1034460kB audio:27931kB subtitle:0 global headers:0kB muxing overhead 2.177458%




I playback  use mplayer.  It got a mess up  at 00:48:26.


The mplayer log:
[wmv3 @ 00000000017e4100]Bits overconsumption: 30160 > 30096 at 9x13

[wmv3 @ 00000000017e4100]concealing 2940 DC, 2940 AC, 2940 MV errors in P frame