They are likely interrelated. Maybe this can help you? 

https://forums.developer.nvidia.com/t/install-nvenc-12-x-with-libnvidia-compute-server-525/276013

On Sat, Mar 30, 2024, 6:43 PM Jim via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:

Any idea how I would fix that?  I saw where it said nvdec isn't there, but I'm trying to use nvenc?  Will it refuse to work if nvdec is missing?

On 3/30/24 14:49, Stephen Partington via PLUG-discuss wrote:
nvdec: is not compiled into this build

That seems to be the issue. 

On Sat, Mar 30, 2024, 5:03 PM Jim via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
Here's a recap of my last post.  I had Ubuntu 22.04 installed on this
machine.  I had Handbrake using the Nvenc option.  Recently I had to
reinstall the OS.  Now Nvendc doesn't work.  I didn't change any
hardware.  Handbrake gives me an error now.   Today I tried again and
clicked the button for the Activity window. Here's what was in it.


OS: Ubuntu 22.04.4 LTS
HandBrake 1.7.3 (2023082100)
Kernel: Linux 5.15.0-100-generic (x86_64)
CPU: Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz x 4
Install Dir: /usr/bin
Config Dir:  /home/delboy/.config/ghb
_______________________________

[13:40:34] Compile-time hardening features are enabled
[13:40:34] nvenc: version 11.1 is available
[13:40:34] nvdec: is not compiled into this build
[13:40:34] CUDA Version: 3.5
[13:40:34] vcn: not available on this system
[13:40:34] qsv: not available on this system
[13:40:34] hb_init: starting libhb thread
[13:40:34] hb_init: starting libhb thread
[13:40:34] hb_init: starting libhb thread
[13:40:40] CPU: Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz
[13:40:40]  - Intel microarchitecture Ivy Bridge
[13:40:40]  - logical processor count: 4
[13:40:40] Intel Quick Sync Video support: no
[13:40:40] hb_scan: path=/home/delboy/a.mp4, title_index=0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/delboy/a.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf58.76.100
   Duration: 00:00:16.58, start: 0.000000, bitrate: 2144 kb/s
   Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661),
yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1979
kb/s, 25 fps, 25 tbr, 12800 tbn (default)
     Metadata:
       handler_name    : VideoHandler
       vendor_id       : [0][0][0][0]
   Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 161 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
       vendor_id       : [0][0][0][0]
[13:40:41] scan: decoding previews for title 1
[13:40:41] scan: audio 0x1: aac, rate=48000Hz, bitrate=161200 Unknown
(AAC LC, 2.0 ch, 161 kbps)
[13:40:41] using container PAR 1:1
[13:40:41] scan: 10 previews, 1920x1080, 25.000 fps, autocrop = 0/6/0/0,
aspect 16:9, PAR 1:1, color profile: 1-1-1, chroma location: left
[13:40:41] Title is likely interlaced or telecined (10 out of 10
previews). You should do something about that.
[13:40:41] libhb: scan thread found 1 valid title(s)
[13:40:55] gtkgui: Custom Preset: /General/1080p 4:3
[13:40:55] Starting work at: Sat Mar 30 13:40:55 2024

[13:40:55] 1 job(s) to process
[13:40:55] json job:
{
     "Audio": {
         "AudioList": [
             {
                 "Bitrate": 0,
                 "DRC": 0.0,
                 "Encoder": "copy:aac",
                 "Mixdown": "none",
                 "PresetEncoder": "copy",
                 "Quality": -3.0,
                 "Samplerate": 0,
                 "Track": 0
             }
         ],
         "CopyMask": [
             "copy:mp3",
             "copy:aac",
             "copy:ac3",
             "copy:dts",
             "copy:dtshd",
             "copy:eac3",
             "copy:flac",
             "copy:truehd"
         ],
         "FallbackEncoder": "av_aac"
     },
     "Destination": {
         "AlignAVStart": false,
         "ChapterList": [
             {
                 "Duration": {
                     "Hours": 0,
                     "Minutes": 0,
                     "Seconds": 16,
                     "Ticks": 1491840
                 },
                 "Name": ""
             }
         ],
         "ChapterMarkers": false,
         "File": "/home/delboy/desktop1/a.mkv",
         "InlineParameterSets": false,
         "Mux": "mkv",
         "Options": {
             "IpodAtom": false,
             "Optimize": false
         }
     },
     "Filters": {
         "FilterList": [
             {
                 "ID": 4,
                 "Settings": {
                     "block-height": "16",
                     "block-thresh": "40",
                     "block-width": "16",
                     "filter-mode": "2",
                     "mode": "3",
                     "motion-thresh": "1",
                     "spatial-metric": "2",
                     "spatial-thresh": "1"
                 }
             },
             {
                 "ID": 5,
                 "Settings": {
                     "mode": "7"
                 }
             },
             {
                 "ID": 10,
                 "Settings": {
                     "mode": 1
                 }
             },
             {
                 "ID": 19,
                 "Settings": {
                     "crop-bottom": 6,
                     "crop-left": 0,
                     "crop-right": 0,
                     "crop-top": 0,
                     "height": 1074,
                     "width": 1920
                 }
             }
         ]
     },
     "Metadata": {
         "Name": "a"
     },
     "PAR": {
         "Den": 1,
         "Num": 1
     },
     "SequenceID": 0,
     "Source": {
         "Angle": 0,
         "HWDecode": 0,
         "Path": "/home/delboy/a.mp4",
         "Range": {
             "End": 1,
             "Start": 1,
             "Type": "chapter"
         },
         "Title": 1
     },
     "Subtitle": {
         "Search": {
             "Burn": true,
             "Default": false,
             "Enable": false,
             "Forced": false
         },
         "SubtitleList": []
     },
     "Video": {
         "ChromaLocation": 1,
         "ColorInputFormat": 0,
         "ColorMatrix": 1,
         "ColorOutputFormat": 0,
         "ColorPrimaries": 1,
         "ColorRange": 1,
         "ColorTransfer": 1,
         "Encoder": "nvenc_h264",
         "HardwareDecode": 0,
         "Level": "auto",
         "MultiPass": false,
         "Options": "",
         "Preset": "medium",
         "Profile": "auto",
         "QSV": {
             "AdapterIndex": 0,
             "AsyncDepth": 0,
             "Decode": false
         },
         "Quality": 30.0,
         "Tune": "",
         "Turbo": false
     }
}
[13:40:55] CPU: Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz
[13:40:55]  - Intel microarchitecture Ivy Bridge
[13:40:55]  - logical processor count: 4
[13:40:55] Intel Quick Sync Video support: no
[13:40:55] hb_scan: path=/home/delboy/a.mp4, title_index=1
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/delboy/a.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf58.76.100
   Duration: 00:00:16.58, start: 0.000000, bitrate: 2144 kb/s
   Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661),
yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1979
kb/s, 25 fps, 25 tbr, 12800 tbn (default)
     Metadata:
       handler_name    : VideoHandler
       vendor_id       : [0][0][0][0]
   Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 161 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
       vendor_id       : [0][0][0][0]
[13:40:55] scan: decoding previews for title 1
[13:40:55] scan: audio 0x1: aac, rate=48000Hz, bitrate=161200 Unknown
(AAC LC, 2.0 ch, 161 kbps)
[13:40:55] using container PAR 1:1
[13:40:55] scan: 10 previews, 1920x1080, 25.000 fps, autocrop = 0/6/0/0,
aspect 16:9, PAR 1:1, color profile: 1-1-1, chroma location: left
[13:40:55] Title is likely interlaced or telecined (10 out of 10
previews). You should do something about that.
[13:40:55] libhb: scan thread found 1 valid title(s)
[13:40:55] Starting Task: Encoding Pass
[13:40:55] job configuration:
[13:40:55]  * source
[13:40:55]    + /home/delboy/a.mp4
[13:40:55]    + title 1, chapter(s) 1 to 1
[13:40:55]    + container: mov,mp4,m4a,3gp,3g2,mj2
[13:40:55]    + data rate: 2144 kbps
[13:40:55]  * destination
[13:40:55]    + /home/delboy/desktop1/a.mkv
[13:40:55]    + container: Matroska (libavformat)
[13:40:55]  * video track
[13:40:55]    + decoder: h264 8-bit (yuv420p)
[13:40:55]      + bitrate 1979 kbps
[13:40:55]    + filters
[13:40:55]      + Comb Detect
(mode=3:spatial-metric=2:motion-thresh=1:spatial-thresh=1:filter-mode=2:block-thresh=40:block-width=16:block-height=16)
[13:40:55]      + Decomb (mode=39)
[13:40:55]      + Framerate Shaper (mode=1)
[13:40:55]        + frame rate: 25.000 fps -> constant 25.000 fps
[13:40:55]      + Crop and Scale
(width=1920:height=1074:crop-top=0:crop-bottom=6:crop-left=0:crop-right=0)
[13:40:55]        + source: 1920 * 1080, crop (0/6/0/0): 1920 * 1074,
scale: 1920 * 1074
[13:40:55]    + Output geometry
[13:40:55]      + storage dimensions: 1920 x 1074
[13:40:55]      + pixel aspect ratio: 1 : 1
[13:40:55]      + display dimensions: 1920 x 1074
[13:40:55]    + encoder: H.264 (NVEnc)
[13:40:55]      + preset:  medium
[13:40:55]      + profile: auto
[13:40:55]      + level:   auto
[13:40:55]      + quality: 30.00 (CQ)
[13:40:55]      + color profile: 1-1-1
[13:40:55]      + chroma location: left
[13:40:55]  * audio track 1
[13:40:55]    + decoder: Unknown (AAC LC, 2.0 ch, 161 kbps) (track 1, id
0x1)
[13:40:55]      + bitrate: 161 kbps, samplerate: 48000 Hz
[13:40:55]    + AAC Passthru
[13:40:55] sync: expecting 414 video frames
[13:40:55] encavcodecInit: H.264 (Nvidia NVENC)
[13:40:55] encavcodec: encoding at rc=vbr, 30.00
[13:40:55] encavcodec: encoding with stored aspect 1/1
[h264_nvenc @ 0x7f3744831bc0] Driver does not support the required nvenc
API version. Required: 12.1 Found: 11.1
[h264_nvenc @ 0x7f3744831bc0] The minimum required Nvidia driver for
nvenc is (unknown) or newer
[13:40:55] encavcodecInit: avcodec_open failed
[13:40:55] Failure to initialise thread 'FFMPEG encoder (libavcodec)'
[13:40:55] comb detect: heavy 0 | light 0 | uncombed 0 | total 0
[13:40:55] vfr: 0 frames output, 0 dropped and 0 duped for CFR/PFR
[13:40:55] vfr: lost time: 0 (0 frames)
[13:40:55] vfr: gained time: 0 (0 frames) (0 not accounted for)
[13:40:55] aac-decoder done: 0 frames, 0 decoder errors
[13:40:55] h264-decoder done: 0 frames, 0 decoder errors
[13:40:55] sync: got 0 frames, 414 expected
[13:40:55] Finished work at: Sat Mar 30 13:40:55 2024

[13:40:55] libhb: work result = 3

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