我正在将多个mp4视频转换为ts，然后将其拼接在一起。
但这有时有时会导致我的视频出现音频问题，其中的声音听起来就像是同时用两个麦克风录制的声音一样。
我有时只能复制它，但我仍然不确定为什么要这么做？有人可以帮忙吗？
这是我从mp4转换成ts的方式。我已经注意到，视频播放的时间越长，音频越差，并且声音也会减少几秒钟。
ffmpeg -i video1.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video1.ts
ffmpeg -i video2.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video2.ts
ffmpeg -i video3.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video3.ts
然后将这些路径保存到txt中，并像这样调用我的拼接命令
ffmpeg -f concat -safe 0 -i list.txt -c copy -bsf:a aac_adtstoasc finalvideo.mp4
这是4个视频的完整输出
C:\Users\Alan\Desktop\videos>ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -i video4.mp4
ffmpeg version N-90433-g5b31dd1c6b Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.0 (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-libopencore-amrnb --enable-libopencore-amrwb --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-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
libavutil 56. 12.100 / 56. 12.100
libavcodec 58. 15.100 / 58. 15.100
libavformat 58. 10.100 / 58. 10.100
libavdevice 58. 2.100 / 58. 2.100
libavfilter 7. 13.100 / 7. 13.100
libswscale 5. 0.102 / 5. 0.102
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:10.80, start: 0.000000, bitrate: 1034 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 879 kb/s, 4.17 fps, 4.17 tbr, 12800 tbn, 8.33 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 165 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:01.62, start: 0.000000, bitrate: 3208 kb/s
Stream #1:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 3203 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
Metadata:
handler_name : VideoHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'video3.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:05.58, start: 0.000000, bitrate: 1954 kb/s
Stream #2:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1805 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 166 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'video4.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.71.100
Duration: 00:00:03.90, start: 0.000000, bitrate: 1746 kb/s
Stream #3:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1744 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
Metadata:
handler_name : VideoHandler