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

[Dennis Mungai]

On Thu, 4 Jul 2019 at 12:34, 冯良怀 <flhcd at 163.com> wrote:

>
>
> 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
>
>
>
>
>
> --
>
>
>
>
>
>
> 成都东方盛行电子有限责任公司
>
>                   研发中心  冯良怀
>
>                                         2019年7月4日
>
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>
>
NVENC's encoder bitrate limit is 50M.
You cannot initialize the encoder with values for -b:v, -maxrate:v or
-bufsize:v exceeding 50M.
I believe the same also applies to Intel's implementations (QuickSync and
VAAPI).