使用ffmpeg合并视频遇到的坑

FFmpeg 64-bit static Windows build from www.gyan.dev Version: 2023-04-06-git-b564ad8eac-full_build-www.gyan.dev License: GPL v3 Source Code: https://github.com/FFmpeg/FFmpeg/commit/b564ad8eac External Assets frei0r plugins: https://www.gyan.dev/ffmpeg/builds/ffmpeg-frei0r-plugins lensfun database: https://www.gyan.dev/ffmpeg/builds/ffmpeg-lensfun-db git-full build configuration: ARCH x86 (generic) big-endian no runtime cpu detection yes standalone assembly yes x86 assembler nasm MMX enabled yes MMXEXT enabled yes 3DNow! enabled yes 3DNow! extended enabled yes SSE enabled yes SSSE3 enabled yes AESNI enabled yes AVX enabled yes AVX2 enabled yes AVX-512 enabled yes AVX-512ICL enabled yes XOP enabled yes FMA3 enabled yes FMA4 enabled yes i686 features enabled yes CMOV is fast yes EBX available yes EBP available yes debug symbols yes strip symbols yes optimize for size no optimizations yes static yes shared no postprocessing support yes network support yes threading support pthreads safe bitstream reader yes texi2html enabled no perl enabled yes pod2man enabled yes makeinfo enabled yes makeinfo supports HTML yes xmllint enabled yes External libraries: avisynth libgsm libsvtav1 bzlib libilbc libtheora chromaprint libjxl libtwolame frei0r liblensfun libuavs3d gmp libmodplug libvidstab gnutls libmp3lame libvmaf iconv libmysofa libvo_amrwbenc ladspa libopencore_amrnb libvorbis libaom libopencore_amrwb libvpx libaribb24 libopenjpeg libwebp libass libopenmpt libx264 libbluray libopus libx265 libbs2b libplacebo libxavs2 libcaca librav1e libxml2 libcdio librist libxvid libcodec2 librubberband libzimg libdav1d libshaderc libzmq libdavs2 libshine libzvbi libflite libsnappy lzma libfontconfig libsoxr mediafoundation libfreetype libspeex sdl2 libfribidi libsrt zlib libgme libssh External libraries providing hardware acceleration: amf dxva2 nvenc cuda ffnvcodec opencl cuda_llvm libmfx vulkan cuvid libvpl d3d11va nvdec Libraries: avcodec avformat swresample avdevice avutil swscale avfilter postproc Programs: ffmpeg ffplay ffprobe Enabled decoders: aac fraps pcm_u8 aac_fixed frwu pcm_vidc aac_latm ftr pcx aasc g2m pfm ac3 g723_1 pgm ac3_fixed g729 pgmyuv acelp_kelvin gdv pgssub adpcm_4xm gem pgx adpcm_adx gif phm adpcm_afc gremlin_dpcm photocd adpcm_agm gsm pictor adpcm_aica gsm_ms pixlet adpcm_argo h261 pjs adpcm_ct h263 png adpcm_dtk h263i ppm adpcm_ea h263p prores adpcm_ea_maxis_xa h264 prosumer adpcm_ea_r1 h264_cuvid psd adpcm_ea_r2 h264_qsv ptx adpcm_ea_r3 hap qcelp adpcm_ea_xas hca qdm2 adpcm_g722 hcom qdmc adpcm_g726 hdr qdraw adpcm_g726le hevc qoi adpcm_ima_acorn hevc_cuvid qpeg adpcm_ima_alp hevc_qsv qtrle adpcm_ima_amv hnm4_video r10k adpcm_ima_apc hq_hqa r210 adpcm_ima_apm hqx ra_144 adpcm_ima_cunning huffyuv ra_288 adpcm_ima_dat4 hymt ralf adpcm_ima_dk3 iac rasc adpcm_ima_dk4 idcin rawvideo adpcm_ima_ea_eacs idf realtext adpcm_ima_ea_sead iff_ilbm rka adpcm_ima_iss ilbc rl2 adpcm_ima_moflex imc roq adpcm_ima_mtf imm4 roq_dpcm adpcm_ima_oki imm5 rpza adpcm_ima_qt indeo2 rscc adpcm_ima_rad indeo3 rv10 adpcm_ima_smjpeg indeo4 rv20 adpcm_ima_ssi indeo5 rv30 adpcm_ima_wav interplay_acm rv40 adpcm_ima_ws interplay_dpcm s302m adpcm_ms interplay_video sami adpcm_mtaf ipu sanm adpcm_psx jacosub sbc adpcm_sbpro_2 jpeg2000 scpr adpcm_sbpro_3 jpegls screenpresso adpcm_sbpro_4 jv sdx2_dpcm adpcm_swf kgv1 sga adpcm_thp kmvc sgi adpcm_thp_le lagarith sgirle adpcm_vima libaom_av1 sheervideo adpcm_xa libaribb24 shorten adpcm_xmd libcodec2 simbiosis_imx adpcm_yamaha libdav1d sipr adpcm_zork libdavs2 siren agm libgsm smackaud aic libgsm_ms smacker alac libilbc smc alias_pix libjxl smvjpeg als libopencore_amrnb snow amrnb libopencore_amrwb sol_dpcm amrwb libopus sonic amv libspeex sp5x anm libuavs3d speedhq ansi libvorbis speex anull libvpx_vp8 srgc apac libvpx_vp9 srt ape libzvbi_teletext ssa apng loco stl aptx lscr subrip aptx_hd m101 subviewer arbc mace3 subviewer1 argo mace6 sunrast ass magicyuv svq1 asv1 mdec svq3 asv2 media100 tak atrac1 metasound targa atrac3 microdvd targa_y216 atrac3al mimic tdsc atrac3p misc4 text atrac3pal mjpeg theo