D:\Applications\ffmpeg_6.0_full>rem READ:

D:\Applications\ffmpeg_6.0_full>rem * https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg

D:\Applications\ffmpeg_6.0_full>rem
ffmpeg version 6.0-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 --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-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-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --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-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.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002523924e080] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'list.txt':
  Duration: N/A, start: -0.023220, bitrate: 29 kb/s
  Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 27 kb/s, 30 fps, 30 tbr, 30k tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.3.100 libx264
Output #0, mp4, to 'b.mp4':
  Metadata:
    encoder         : Lavf60.3.100
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 27 kb/s, 30 fps, 30 tbr, 30k tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.3.100 libx264
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025239902d40] Auto-inserting h264_mp4toannexb bitstream filter
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218112, current: 150024; changing to 218113. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218113, current: 151024; changing to 218114. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218114, current: 152024; changing to 218115. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218115, current: 153024; changing to 218116. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218116, current: 154024; changing to 218117. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218117, current: 155024; changing to 218118. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218118, current: 156024; changing to 218119. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218119, current: 157024; changing to 218120. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218120, current: 158024; changing to 218121. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218121, current: 159024; changing to 218122. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218122, current: 160024; changing to 218123. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218123, current: 161024; changing to 218124. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218124, current: 162024; changing to 218125. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218125, current: 163024; changing to 218126. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218126, current: 164024; changing to 218127. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218127, current: 165024; changing to 218128. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218128, current: 166024; changing to 218129. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218129, current: 167024; changing to 218130. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218130, current: 168024; changing to 218131. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218131, current: 169024; changing to 218132. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218132, current: 170024; changing to 218133. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218133, current: 171024; changing to 218134. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218134, current: 172024; changing to 218135. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218135, current: 173023; changing to 218136. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218136, current: 174023; changing to 218137. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218137, current: 175023; changing to 218138. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218138, current: 176023; changing to 218139. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218139, current: 177023; changing to 218140. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218140, current: 178023; changing to 218141. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218141, current: 179023; changing to 218142. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218142, current: 180023; changing to 218143. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218143, current: 181023; changing to 218144. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218144, current: 182023; changing to 218145. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218145, current: 183023; changing to 218146. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218146, current: 184023; changing to 218147. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218147, current: 185023; changing to 218148. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218148, current: 186023; changing to 218149. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218149, current: 187023; changing to 218150. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218150, current: 188023; changing to 218151. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218151, current: 189023; changing to 218152. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218152, current: 190023; changing to 218153. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218153, current: 191023; changing to 218154. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218154, current: 192023; changing to 218155. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218155, current: 193023; changing to 218156. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218156, current: 194022; changing to 218157. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218157, current: 195022; changing to 218158. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218158, current: 196022; changing to 218159. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218159, current: 197022; changing to 218160. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218160, current: 198022; changing to 218161. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218161, current: 199022; changing to 218162. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218162, current: 200022; changing to 218163. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218163, current: 201022; changing to 218164. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218164, current: 202022; changing to 218165. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218165, current: 203022; changing to 218166. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218166, current: 204022; changing to 218167. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218167, current: 205022; changing to 218168. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218168, current: 206022; changing to 218169. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218169, current: 207022; changing to 218170. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218170, current: 208022; changing to 218171. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218171, current: 209022; changing to 218172. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218172, current: 210022; changing to 218173. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218173, current: 211022; changing to 218174. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218174, current: 212022; changing to 218175. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218175, current: 213022; changing to 218176. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218176, current: 214021; changing to 218177. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218177, current: 215021; changing to 218178. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218178, current: 216021; changing to 218179. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218179, current: 217021; changing to 218180. This may result in incorrect timestamps in the output file.
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218180, current: 218021; changing to 218181. This may result in incorrect timestamps in the output file.
frame=25992 fps=21754 q=-1.0 Lsize= 1519621kB time=00:14:49.39 bitrate=13996.8kbits/s speed= 744x
video:9649kB audio:1519216kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

OUTPUT = b.mp4

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