我用ffmpeg连接了我的游戏录音的两个视频。我写了一个list.txt文件，其中列出了两个文件：
list.txt:
file 2019~06~28_~_Game_1_~_Part_2.mp4
file 2019~06~28_~_Game_1_~_Part_3.mp4
然后我运行ffmpeg来连接它们：
ffmpeg -safe 0 -f concat -i list.txt -c copy "output.mp4"
但是，最终的视频似乎在第二个视频的第一秒跳过帧（或非常快地通过它们），从而导致对运动的感知突然快进。
同一场比赛视频录像机“ GeForce Experience”在一次游戏中录制了这两个视频。串联时它们应该匹配得很平滑。
这是ffmpeg的输出：
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001600bbdb5e0] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'list.txt':
Duration: N/A, start: 0.000000, bitrate: 24674 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 24479 kb/s, 59.69 fps, 60 tbr, 90k tbn, 120 tbc
Metadata:
creation_time : 2019-06-29T04:43:18.000000Z
handler_name : VideoHandle
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s
Metadata:
creation_time : 2019-06-29T04:43:18.000000Z
handler_name : SoundHandle
File 'output.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf57.83.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24479 kb/s, 59.69 fps, 60 tbr, 90k tbn, 90k tbc
Metadata:
creation_time : 2019-06-29T04:43:18.000000Z
handler_name : VideoHandle
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s
Metadata:
creation_time : 2019-06-29T04:43:18.000000Z
handler_name : SoundHandle
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001600bbdb5e0] Auto-inserting h264_mp4toannexb bitstream filter
frame= 7405 fps=0.0 q=-1.0 Lsize= 221175kB time=00:02:03.63 bitrate=14655.4kbits/s speed= 157x
video:218137kB audio:2862kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.079741%
尤其是，我不知道“自动插入h254_mp4toannexb比特流过滤器”是什么意思。这是否引起了意外的变化？