[FFmpeg-user] Why the fps of concatenate video file change with old video file?

[cuizhe]

ffmpeg version N-73266-g4aa0de6 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype
--enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
--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-libvidstab
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma
--enable-decklink --enable-zlib
libavutil      54. 27.100 / 54. 27.100
libavcodec     56. 45.101 / 56. 45.101
libavformat    56. 40.100 / 56. 40.100
libavdevice    56.  4.100 / 56.  4.100
libavfilter     5. 19.100 /  5. 19.100
libswscale      3.  1.101 /  3.  1.101
libswresample   1.  2.100 /  1.  2.100
libpostproc    53.  3.100 / 53.  3.100
[wmv3 @ 04d452a0] Extra data: 8 bits left, value: 20
[wmv3 @ 04d14d00] Extra data: 8 bits left, value: 20
Input #0, concat, from '1.txt':
Duration: N/A, start: 0.000000, bitrate: 4214 kb/s
Stream #0:0: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 720x576, 4194
kb/s, SAR 16:15 DAR 4:3, 25 fps, 25 tbr, 1k tbn, 1k tbc
Stream #0:1: Audio: wmavoice ([10][0][0][0] / 0x000A), 22050 Hz, mono, flt,
20 kb/s
[asf @ 04d12120] Codec for stream 0 does not use global headers but
container format requires global headers
[asf @ 04d12120] Codec for stream 1 does not use global headers but
container format requires global headers
Output #0, asf, to 'output.wmv':
Metadata:
WM/EncodingSettings: Lavf56.40.100
Stream #0:0: Video: wmv3 (WMV3 / 0x33564D57), yuv420p, 720x576 [SAR 16:15
DAR 4:3], q=2-31, 4194 kb/s, 25 fps, 25 tbr, 1k tbn, 25 tbc
Stream #0:1: Audio: wmavoice ([10][0][0][0] / 0x000A), 22050 Hz, mono, 20
kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[wmv3 @ 04ce8880] Extra data: 8 bits left, value: 20
frame=  538 fps=0.0 q=-1.0 Lsize=    5723kB time=00:00:21.52
bitrate=2178.5kbits/s  
video:5593kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 1.206905%



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