@john_dennis It is. I tried several other players but can't play the prores version in anything other than vlc and the quicktime player.

The latter shows the same contrast shutter effect so at least VP and Apple are in agreement.

Can you upload a pristine GoPro clip showing the problem to Drive or Dropbox?

Just this morning I saw another GoPro clip with a dangling GOP right at tje beginning. Or here's the command using ffprobe:

ffprobe -v error -hide_banner -of default=noprint_wrappers=0 -print_format flat -select_streams v:0 -show_entries frame=pict_type desktop/"My Movie.mp4" > desktop/GOPoutput.csv 2>&1

@Musicvid the file's uploading now but will be a while. I'll respond again when it's done.

I've run ffprobe on the source, what would you like to see from it? Here are the first few frames...

frames.frame.0.pict_type="I"
frames.frame.1.pict_type="P"
frames.frame.2.pict_type="P"
frames.frame.3.pict_type="P"
frames.frame.4.pict_type="P"
frames.frame.5.pict_type="P"
frames.frame.6.pict_type="P"
frames.frame.7.pict_type="P"
frames.frame.8.pict_type="P"
frames.frame.9.pict_type="P"
frames.frame.10.pict_type="P"
frames.frame.11.pict_type="P"
frames.frame.12.pict_type="P"

Thanks, that's all I wanted to see. First frame is an I-frame, so it's ok.

@Musicvid thanks. If you still would like to see the original clip, https://drive.google.com/file/d/1r7HuSDVFd8va-paA3ZbcvAfBDD6vODam/view?usp=sharing

Sure thanks for uploading.

@michael-harrison Have you ever tried editing double-rate clips like your original mp4 by just changing the undersample rate to .500 in clip properties? Seems to help allot here on my laptop with your clip. If that makes it more editable on your system it might save you allot of time and disk space while preserving original quality so long as it still renders when you set it back.

@michael-harrison

I converted your clip to ProRes Proxy using the Shutter Encoder and I don't experience the same issue as before.

General
Complete name                            : C:\Users\John\Downloads\GX011273_Apple_ProRes_Proxy.mov
Format                                   : MPEG-4
Format profile                           : QuickTime
Codec ID                                 : qt   0000.02 (qt  )
File size                                : 2.76 GiB
Duration                                 : 56 s 223 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 422 Mb/s
Encoded date                             : UTC 2021-10-18 17:27:10
Tagged date                              : UTC 2021-10-18 17:27:10
Writing application                      : Lavf59.5.100

Video
ID                                       : 1
Format                                   : ProRes
Format version                           : Version 0
Format profile                           : 422 Proxy
Codec ID                                 : apco
Duration                                 : 56 s 223 ms
Bit rate mode                            : Variable
Bit rate                                 : 421 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 59.940 (60000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.846
Stream size                              : 2.75 GiB (100%)
Title                                    : GoPro H.265
Writing library                          : Apple
Language                                 : English
Encoded date                             : UTC 2021-10-18 17:27:10
Tagged date                              : UTC 2021-10-18 17:27:10
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : PCM
Format settings                          : Little / Signed
Codec ID                                 : sowt
Duration                                 : 56 s 214 ms
Bit rate mode                            : Constant
Bit rate                                 : 1 536 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Bit depth                                : 16 bits
Stream size                              : 10.3 MiB (0%)
Title                                    : GoPro AAC  
Language                                 : English
Default                                  : Yes
Alternate group                          : 1
Encoded date                             : UTC 2021-10-18 17:27:10
Tagged date                              : UTC 2021-10-18 17:27:10

Other
ID                                       : 3
Type                                     : Time code
Format                                   : QuickTime TC
Duration                                 : 56 s 223 ms
Frame rate                               : 59.940 (60000/1001) FPS
Time code of first frame                 : 16:06:29;31
Time code, striped                       : Yes
Title                                    : GoPro H.265
Language                                 : English
Default                                  : No
Encoded date                             : UTC 2021-10-18 17:27:10
Tagged date                              : UTC 2021-10-18 17:27:10

The file is much larger that the HEVC file... DUH.

@Howard-Vigorita I haven't, I've been trying to default to using proxies just generally so I'm not fighting VP problems with decoding end-user formats.

@john_dennis that's... interesting. We're using the same version of SE and I'm also using the defaults in SE.

@michael-harrison

Problem doesn't exist in a Vegas render to ProRes 422.

[edit /] Nor am I able to duplicate the behavior in Shutter Encoder. [/]

Do you know which HW decoder is causing that?

@Musicvid No, I haven't seen a way to get SE to say what decoder it's using.

@Musicvid I had a chance to try all the options in SE and they all have that odd contrast shutter effect at the beginning. fwiw I'm using the latest studio driver with nvidia 1660 all default settings. Did a ddu cleaning last week.

I'm beginning to think there are some minor bugs with 1660, probably easy for them to fix. The beginning of your GoPro file looks clean, as opposed to a couple of others I've seen with stray b-frames.

Just curious, does the shading happen at exactly the same frame with subsequent encodes? May be a good bit of information for your graphics folks. Did you run ffprobe on the problem ProRes file as well?

@Musicvid No, with some encodes it happens over fewer frames.

Hmm...

For others that run into this, using the 2021-11-18 ffmpeg build and the parameters from SE, The final video doesn't have that shutter effect.

https://www.gyan.dev/ffmpeg/builds/

I'm working with the author of SE so hopefully this will give him some insight into why SE shows the problem and naked ffmpeg doesn't. Could be a bug that was fixed or something specific to the way the build he's using was packaged.

D:\Vegas Projects (d)\Parkway Leaf Peeping 2021\Original>c:\ffmpeg\bin\ffmpeg.exe  -hwaccel cuda -i "GX011273.MP4" -r 25.0 -c:v prores -profile:v 0 -pix_fmt yuv422p10 -filter_complex "[0:v]minterpolate=fps=25.0:mi_mode=blend[out]" -map "[out]" -c:a pcm_s16le -ar 48000 -map a? -sws_flags bicubic -metadata:s "encoder=Apple ProRes Proxy" -vendor apl0 -movflags write_colr+write_gama -flags bitexact -metadata creation_time="2021-11-22T16:30:17.412920700Z" -y "GX011273-proxy.mov"
ffmpeg version 2021-11-18-git-85a6b7f7b7-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.2.0 (Rev2, 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-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --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-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --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      57.  9.100 / 57.  9.100
  libavcodec     59. 13.100 / 59. 13.100
  libavformat    59.  9.101 / 59.  9.101
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8. 17.100 /  8. 17.100
  libswscale      6.  1.100 /  6.  1.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'GX011273.MP4':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    creation_time   : 2021-10-15T16:07:27.000000Z
    firmware        : HD8.01.02.50.71
  Duration: 00:00:56.22, start: 0.000000, bitrate: 60245 kb/s
  Stream #0:0[0x1](eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 59987 kb/s, 59.94 fps, 59.94 tbr, 60k tbn (default)
    Metadata:
      creation_time   : 2021-10-15T16:07:27.000000Z
      handler_name    : GoPro H.265
      vendor_id       : [0][0][0][0]
      encoder         : GoPro H.265 encoder
      timecode        : 16:06:29:31
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    Metadata:
      creation_time   : 2021-10-15T16:07:27.000000Z
      handler_name    : GoPro AAC
      vendor_id       : [0][0][0][0]
      timecode        : 16:06:29:31
  Stream #0:2[0x3](eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2021-10-15T16:07:27.000000Z
      handler_name    : GoPro TCD
      timecode        : 16:06:29:31
  Stream #0:3[0x4](eng): Data: bin_data (gpmd / 0x646D7067), 43 kb/s (default)
    Metadata:
      creation_time   : 2021-10-15T16:07:27.000000Z
      handler_name    : GoPro MET
Stream mapping:
  Stream #0:0 (hevc) -> minterpolate (graph 0)
  minterpolate (graph 0) -> Stream #0:0 (prores)
  Stream #0:1 -> #0:1 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'GX011273-proxy.mov':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    firmware        : HD8.01.02.50.71
    creation_time   : 2021-11-22T16:30:17.412920700Z
    encoder         : Lavf59.9.101
  Stream #0:0: Video: prores (Proxy) (apco / 0x6F637061), yuv422p10le(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 12800 tbn
    Metadata:
      encoder         : Apple ProRes Proxy
  Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2021-10-15T16:07:27.000000Z
      handler_name    : GoPro AAC
      vendor_id       : [0][0][0][0]
      timecode        : 16:06:29:31
      encoder         : Apple ProRes Proxy
frame= 1405 fps= 27 q=-0.0 Lsize= 1245096kB time=00:00:56.21 bitrate=181448.6kbits/s speed=1.09x
video:1234535kB audio:10540kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001751%