[FFmpeg-user] Drop frames during framemd5 calculation of DPX files

[Matthew Yang]

Hello there

I have been experiencing drop frames during calculation of framemd5
checksums for a bunch of DPX files.

The command:

*ffmpeg -start_number 86400 -i finalDPX_forDCP\Respire%08d.dpx -f framemd5
original_md5_2.txt*

The result:

frame=20837 fps=5.2 q=-0.0 Lsize=    1628kB time=00:14:28.20 bitrate=
 15.4kbits/s dup=0 *drop=867* speed=0.216x
video:1107194832kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: unknown

I ran the checksum calculation twice and it has the same exact number of
drop frames.

The full results can be seen in the txt file attached.

Please kindly advise on how I can solve this problem as I am unable to
resolve it on my own.

Thank you!

Best
Matthew

Matthew Yang* | *Archive Officer
Asian Film Archive
100 Victoria Street, #06-01
Singapore 188064
*Tel:* +65 6957 8508 (Collections) / +65 6777 3243 (Main) | *Fax:* +65 6694
5264
*Website <https://www.asianfilmarchive.org/>* | *Facebook*
<https://www.facebook.com/asianfilmarchive/?ref=br_rs> | *Twitter*
<https://twitter.com/AFA_Archive> | *Instagram*
<https://www.instagram.com/asianfilmarchive/>
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Y:\Staging\Film Archive\Ho Widing\Respire from Modern Film Lab>ffmpeg -start_number 86400 -i finalDPX_forDCP\Respire%08d.dpx -f framemd5 original_md5_2.txt
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --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-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  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
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, image2, from 'finalDPX_forDCP\Respire%08d.dpx':
  Duration: 00:14:28.16, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: dpx, gbrp10le, 4096x2214 [SAR 1:1 DAR 2048:1107], 24 tbr, 25 tbn, 24 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (dpx (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, framemd5, to 'original_md5_2.txt':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: rawvideo (G3[0][10] / 0xA003347), gbrp10le, 4096x2214 [SAR 1:1 DAR 2048:1107], q=2-31, 6529351 kb/s, 24 fps, 24 tbn, 24 tbc
    Metadata:
      encoder         : Lavc58.54.100 rawvideo
frame=20837 fps=5.2 q=-0.0 Lsize=    1628kB time=00:14:28.20 bitrate=  15.4kbits/s dup=0 drop=867 speed=0.216x
video:1107194832kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown