我想连接两个mkv视频文件，一个1秒（32帧）和一个20分钟，但是较短的有不同的编码。我不想对两者进行编码，但是更短，我想从较长的流中获取编解码器设置，然后使用类似于以下的命令对它们进行连接：
ffmpeg -f concat -i list.txt -c copy output.mkv
list.txt包含：
file properly-encoded-shorter-stream.mkv
file longer-stream.mkv
音频流没有问题，两者都是未压缩的PCM wav。 我的媒体文件的详细信息（3.avi是使用avisynth / wine / virtualdub生成的，其他mkv文件是从媒体文件中获取的）
ffmpeg -i 3.avi -i 5.mkv
ffmpeg version 2.3.1 Copyright (c) 2000-2014 the FFmpeg developers
built on Jul 31 2014 14:53:16 with gcc 4.9.1 (GCC)
configuration: --prefix=/usr --disable-debug --disable-static --enable-avisynth --enable-avresample --enable-decoder=atrac3 --enable-decoder=atrac3p --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
libavutil 52. 92.100 / 52. 92.100
libavcodec 55. 69.100 / 55. 69.100
libavformat 55. 48.100 / 55. 48.100
libavdevice 55. 13.102 / 55. 13.102
libavfilter 4. 11.100 / 4. 11.100
libavresample 1. 3. 0 / 1. 3. 0
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
[matroska,webm @ 0x84e3100] Unknown entry 0x1A45DFA3
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, matroska,webm, from '3.avi':
Metadata:
encoder : libebml-0.7.5 & libmatroska-0.7.7
creation_time : 2014-08-04 23:08:59
Duration: 00:00:01.03, start: 0.000000, bitrate: 153515 kb/s
Stream #0:0(eng): Video: rawvideo, bgr24, 528x400, SAR 1:1 DAR 33:25, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
Stream #0:1(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
Guessed Channel Layout for Input Stream #1.1 : stereo
Input #1, matroska,webm, from '5.mkv':
Metadata:
encoder : libebml-0.7.5 & libmatroska-0.7.7
creation_time : 2014-08-04 22:45:57
Duration: 00:06:18.45, start: 0.000000, bitrate: 3219 kb/s
Stream #1:0(eng): Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 528x400 [SAR 1:1 DAR 33:25], 29.97 fps, 29.97 tbr, 1k tbn, 29.98 tbc (default)
Stream #1:1(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s (default)