使用这个cmd（从这里：https://www.winxdvd.com/dvd-ripper/rip-dvd-with-ffmpeg.htm) 将 DVD VOB 文件转换为 mp4。（根据需要调整文件名）
ffmpeg -i "concat:VTS_01_1.VOB|VTS_01_2.VOB|VTS_01_3.VOB" -b:v 1500k -r 30 -vcodec h264 -strict -2 -acodec aac -ar 44100 -f mp4 convert.mp4
它以前在多张 DVD 上都有效，但现在我遇到一张 DVD，生成的 mp4 没有音频。（我已通过在 DVD 播放器中播放 DVD 确认有音频）
是不是缺少了什么？
干杯。
更新：
@Rotem 建议的 cmd 不起作用。
关键信息似乎是：
[mpeg2video @ 0000019386b69400] Invalid frame dimensions 0x0.
...
[fc#0 @ 00000193865ae280] Stream specifier ':a:0' in filtergraph description [0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0][3:v:0][3:a:0][4:v:0][4:a:0][5:v:0][5:a:0][6:v:0][6:a:0][7:v:0][7:a:0][8:v:0][8:a:0][9:v:0][9:a:0][10:v:0][10:a:0][11:v:0][11:a:0]concat=n=12:v=1:a=1[outv][outa] matches no streams.
完整的 cmd 控制台输出：
ffmpeg -i VIDEO_TS.VOB -i VTS_01_0.VOB -i VTS_01_1.VOB -i VTS_01_2.VOB -i VTS_01_3.VOB -i VTS_01_4.VOB -i VTS_01_5.VOB -i VTS_01_6.VOB -i VTS_01_7.VOB -i VTS_01_8.VOB -i VTS_02_0.VOB -i VTS_02_1.VOB -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0][3:v:0][3:a:0][4:v:0][4:a:0][5:v:0][5:a:0][6:v:0][6:a:0][7:v:0][7:a:0][8:v:0][8:a:0][9:v:0][9:a:0][10:v:0][10:a:0][11:v:0][11:a:0]concat=n=12:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" -vcodec libx264 -acodec aac -ar 44100 D:\dvd.mp4
ffmpeg -i VIDEO_TS.VOB -i VTS_01_0.VOB -i VTS_01_1.VOB -i VTS_01_2.VOB -i VTS_01_3.VOB -i VTS_01_4.VOB -i VTS_01_5.VOB -i VTS_01_6.VOB -i VTS_01_7.VOB -i VTS_01_8.VOB -i VTS_02_0.VOB -i VTS_02_1.VOB -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0][3:v:0][3:a:0][4:v:0][4:a:0][5:v:0][5:a:0][6:v:0][6:a:0][7:v:0][7:a:0][8:v:0][8:a:0][9:v:0][9:a:0][10:v:0][10:a:0][11:v:0][11:a:0]concat=n=12:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" -vcodec libx264 -acodec aac -ar 44100 D:\dvd.mp4
ffmpeg version 2023-12-28-git-c1340f3439-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --pkg-config=pkgconf --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-dxva2 --enable-d3d11va --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 58. 36.100 / 58. 36.100
libavcodec 60. 36.100 / 60. 36.100
libavformat 60. 20.100 / 60. 20.100
libavdevice 60. 4.100 / 60. 4.100
libavfilter 9. 14.102 / 9. 14.102
libswscale 7. 6.100 / 7. 6.100
libswresample 4. 13.100 / 4. 13.100
libpostproc 57. 4.100 / 57. 4.100
Input #0, mpeg, from 'VIDEO_TS.VOB':
Duration: 00:00:00.02, start: 0.060000, bitrate: 4096 kb/s
Stream #0:0[0x1bf]: Data: dvd_nav_packet
Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x576 [SAR 16:15 DAR 4:3], 9000 kb/s, 50 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008 vbv_delay: N/A
Input #1, mpeg, from 'VTS_01_0.VOB':
Duration: 00:00:00.14, start: 0.060000, bitrate: 235544 kb/s
Stream #1:0[0x1bf]: Data: dvd_nav_packet
Stream #1:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x576 [SAR 64:45 DAR 16:9], 9000 kb/s, 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #1:2[0x22]: Subtitle: dvd_subtitle
Stream #1:3[0x21]: Subtitle: dvd_subtitle
Input #2, mpeg, from 'VTS_01_1.VOB':
Duration: 00:28:12.60, start: 0.060000, bitrate: 5074 kb/s
Stream #2:0[0x1bf]: Data: dvd_nav_packet
Stream #2:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #2:2[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
[mpeg2video @ 0000019386b69400] Invalid frame dimensions 0x0.
Last message repeated 10 times
Input #3, mpeg, from 'VTS_01_2.VOB':
Duration: 00:28:11.10, start: 1692.476000, bitrate: 5079 kb/s
Stream #3:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #3:1[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #3:2[0x1bf]: Data: dvd_nav_packet
Stream #3:3[0x22]: Subtitle: dvd_subtitle
Stream #3:4[0x21]: Subtitle: dvd_subtitle
[mpeg2video @ 0000019386b66800] Invalid frame dimensions 0x0.
Last message repeated 6 times
Input #4, mpeg, from 'VTS_01_3.VOB':
Duration: 00:28:10.96, start: 3383.580000, bitrate: 5079 kb/s
Stream #4:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #4:1[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #4:2[0x1bf]: Data: dvd_nav_packet
[mpeg2video @ 0000019386b73340] Invalid frame dimensions 0x0.
Last message repeated 10 times
Input #5, mpeg, from 'VTS_01_4.VOB':
Duration: 00:28:10.70, start: 5074.396000, bitrate: 5080 kb/s
Stream #5:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #5:1[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #5:2[0x1bf]: Data: dvd_nav_packet
[mpeg2video @ 0000019386b73f40] Invalid frame dimensions 0x0.
Last message repeated 8 times
Input #6, mpeg, from 'VTS_01_5.VOB':
Duration: 00:28:12.53, start: 6765.052000, bitrate: 5075 kb/s
Stream #6:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #6:1[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #6:2[0x1bf]: Data: dvd_nav_packet
Stream #6:3[0x22]: Subtitle: dvd_subtitle
Stream #6:4[0x21]: Subtitle: dvd_subtitle
[mpeg2video @ 0000019386b41500] Invalid frame dimensions 0x0.
Last message repeated 10 times
Input #7, mpeg, from 'VTS_01_6.VOB':
Duration: 00:28:12.16, start: 8457.404000, bitrate: 5076 kb/s
Stream #7:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #7:1[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #7:2[0x1bf]: Data: dvd_nav_packet
[mpeg2video @ 0000019386b3f900] Invalid frame dimensions 0x0.
Input #8, mpeg, from 'VTS_01_7.VOB':
Duration: 00:28:11.98, start: 10149.596000, bitrate: 5076 kb/s
Stream #8:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #8:1[0x1bf]: Data: dvd_nav_packet
Stream #8:2[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #8:3[0x22]: Subtitle: dvd_subtitle
Stream #8:4[0x21]: Subtitle: dvd_subtitle
[mpeg2video @ 0000019386af1d80] Invalid frame dimensions 0x0.
Last message repeated 10 times
Input #9, mpeg, from 'VTS_01_8.VOB':
Duration: 00:21:09.50, start: 11841.436000, bitrate: 5061 kb/s
Stream #9:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 7400000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #9:1[0x80]: Audio: ac3, 48000 Hz, 5.0(side), fltp, 384 kb/s
Stream #9:2[0x1bf]: Data: dvd_nav_packet
Input #10, mpeg, from 'VTS_02_0.VOB':
Duration: 00:00:00.02, start: 0.060000, bitrate: 4096 kb/s
Stream #10:0[0x1bf]: Data: dvd_nav_packet
Stream #10:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x576 [SAR 16:15 DAR 4:3], 9000 kb/s, 50 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008 vbv_delay: N/A
[mpeg @ 0000019386c9e500] stream 2 : no PTS found at end of file, duration not set
Input #11, mpeg, from 'VTS_02_1.VOB':
Duration: 00:00:03.00, start: 0.060000, bitrate: 5559 kb/s
Stream #11:0[0x1bf]: Data: dvd_nav_packet
Stream #11:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 9000 kb/s, 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #11:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 128 kb/s
[fc#0 @ 00000193865ae280] Stream specifier ':a:0' in filtergraph description [0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0][3:v:0][3:a:0][4:v:0][4:a:0][5:v:0][5:a:0][6:v:0][6:a:0][7:v:0][7:a:0][8:v:0][8:a:0][9:v:0][9:a:0][10:v:0][10:a:0][11:v:0][11:a:0]concat=n=12:v=1:a=1[outv][outa] matches no streams.
Error initializing complex filters: Invalid argument
PS V:\VIDEO_TS>