[FFmpeg-user] How to set h264_nvenc encode 4K bitrate to 500mb?

[冯良怀]

hi,
   The maximum code rate set by h264_nvenc encoder for 4K coding is 140 mb. Program error occurs when the code rate exceeds 140 mb：[h264_nvenc @ 0000017e632de440] InitializeEncoder failed: invalid param (8).
   How to Set the Bit Rate to 500MB in 4K Coding?


ffmpeg.exe  -i L:\1.mp4 -c:v h264_nvenc -b:v 500000k  -g 25 -c:a aac -f mp4 l:\test500mb.mp4 -y
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
  libavutil      56. 14.100 / 56. 14.100
  libavcodec     58. 18.100 / 58. 18.100
  libavformat    58. 12.100 / 58. 12.100
  libavdevice    58.  3.100 / 58.  3.100
  libavfilter     7. 16.100 /  7. 16.100
  libswscale      5.  1.100 /  5.  1.100
  libswresample   3.  1.100 /  3.  1.100
  libpostproc    55.  1.100 / 55.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'L:\1.mp4':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf58.12.100
  Duration: 00:01:08.60, start: 0.000000, bitrate: 18142 kb/s
    Stream #0:0(eng): Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, unknown/bt2020/unknown), 3840x2160 [SAR 1:1 DAR 16:9], 11996 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : DataHandler
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 7.1, s16, 6144 kb/s (default)
    Metadata:
      handler_name    : DataHandler
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[h264_nvenc @ 0000017e632de440] InitializeEncoder failed: invalid param (8)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0000017e6322b700] Qavg: 45469.547
[aac @ 0000017e6322b700] 2 frames left in the queue on closing





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