help with mp4 download

[monk87]

Hi guys.

Need help with mpd download

mpd link: https://vod-krakowplay.app.insysgo.pl/assets/2020_11_24_KFG_Building_Bridges-aws-55c5a...dash/index.mpd

referer: https://playkrakow.com/vods/vod.290

i got l3 mpd key with a plugin (d481f1ac1c81960ccf2aca72401a6da5 (KID=3d6f3d0cd57b466fbbbcd10e13640864)) and what i tried to do was download init file + all the segments (01-36), merged them to one file and tried to decrypt with a command below

ffmpeg -decryption_key d481f1ac1c81960ccf2aca72401a6da5 -i out.mp4 decrypted.mp4

ffmpeg output looks like this:

ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55e5c2f21340] Found duplicated MOOV Atom. Skipped it
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55e5c2f21340] Incorrect number of samples in encryption info
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55e5c2f21340] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1280x720, 2683 kb/s): unspecified pixel forma
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  Metadata:
    creation_time   : 2020-12-06T07:30:52.000000Z
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1dash
  Duration: 00:04:44.28, bitrate: 2696 kb/s
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none, 1280x720, 2683 kb/s, 25 fps, 90k tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-12-06T07:30:52.000000Z
      handler_name    : ETI ISO Video Media Handler
      encoder         : Elemental H.264
    Side data:
      unknown side data type 24 (123699 bytes)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55e5c2f21340] Incorrect number of samples in encryption info
out.mp4: Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!

any clues what am i doing wrong ?

[monk87]

ok i guess i figured it out. each separate file needs to be merged with init file and decrypted before merging segments to one big file.