今まで使っていたオプションにエラー
旧録画サーバーのffmpegで、H.265への変換は以下のオプションを使用していました。
-vcodec hevc_nvenc -rc vbr_hq -cq 30
同じオプションを使用しましたが、以下のエラーが出力されました。
「Specified rc mode is deprecated」なので、「rcモード（rcのオプション）は推奨されていない」ということとでしょうか。
また、可変ビットなのに固定ビットのオプション指定をしているようなので、これもエラーになっているようです。
[hevc_nvenc @ 0x562e6d6232c0] Specified rc mode is deprecated.
[hevc_nvenc @ 0x562e6d6232c0] Use -rc constqp/cbr/vbr, -tune and -multipass instead.
[hevc_nvenc @ 0x562e6d6232c0] InitializeEncoder failed: invalid param (8): Preset P1 to P7 not supported with older 2 Pass RC Modes(CBR_HQ, VBR_HQ) and cbr lowdelayEnable NV_ENC_RC_PARAMS::multiPass flag for two pass encoding and set
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
エンコードオプションを確認
ffmpeg -h encoder=hevc_nvencでオプションを表示します。
以下のように-rcオプションは表示されているので、使えはするようです。
hevc_nvenc AVOptions:
-preset <int> E..V....... Set the encoding preset (from 0 to 18) (default p4)
default 0 E..V.......
slow 1 E..V....... hq 2 passes
medium 2 E..V....... hq 1 pass
fast 3 E..V....... hp 1 pass
hp 4 E..V.......
hq 5 E..V.......
bd 6 E..V.......
ll 7 E..V....... low latency
llhq 8 E..V....... low latency hq
llhp 9 E..V....... low latency hp
lossless 10 E..V....... lossless
losslesshp 11 E..V....... lossless hp
p1 12 E..V....... fastest (lowest quality)
p2 13 E..V....... faster (lower quality)
p3 14 E..V....... fast (low quality)
p4 15 E..V....... medium (default)
p5 16 E..V....... slow (good quality)
p6 17 E..V....... slower (better quality)
p7 18 E..V....... slowest (best quality)
-tune <int> E..V....... Set the encoding tuning info (from 1 to 4) (default hq)
hq 1 E..V....... High quality
ll 2 E..V....... Low latency
ull 3 E..V....... Ultra low latency
lossless 4 E..V....... Lossless
-profile <int> E..V....... Set the encoding profile (from 0 to 4) (default main)
main 0 E..V.......
main10 1 E..V.......
rext 2 E..V.......
-level <int> E..V....... Set the encoding level restriction (from 0 to 186) (default auto)
auto 0 E..V.......
1 30 E..V.......
1.0 30 E..V.......
2 60 E..V.......
2.0 60 E..V.......
2.1 63 E..V.......
3 90 E..V.......
3.0 90 E..V.......
3.1 93 E..V.......
4 120 E..V.......
4.0 120 E..V.......
4.1 123 E..V.......
5 150 E..V.......
5.0 150 E..V.......
5.1 153 E..V.......
5.2 156 E..V.......
6 180 E..V.......
6.0 180 E..V.......
6.1 183 E..V.......
6.2 186 E..V.......
-tier <int> E..V....... Set the encoding tier (from 0 to 1) (default main)
main 0 E..V.......
high 1 E..V.......
-rc <int> E..V....... Override the preset rate-control (from -1 to INT_MAX) (default -1)
constqp 0 E..V....... Constant QP mode
vbr 1 E..V....... Variable bitrate mode
cbr 2 E..V....... Constant bitrate mode
vbr_minqp 8388612 E..V....... Variable bitrate mode with MinQP (deprecated)
ll_2pass_quality 8388616 E..V....... Multi-pass optimized for image quality (deprecated)
ll_2pass_size 8388624 E..V....... Multi-pass optimized for constant frame size (deprecated)
vbr_2pass 8388640 E..V....... Multi-pass variable bitrate mode (deprecated)
cbr_ld_hq 8388616 E..V....... Constant bitrate low delay high quality mode
cbr_hq 8388624 E..V....... Constant bitrate high quality mode
vbr_hq 8388640 E..V....... Variable bitrate high quality mode
-rc-lookahead <int> E..V....... Number of frames to look ahead for rate-control (from 0 to INT_MAX) (default 0)
-surfaces <int> E..V....... Number of concurrent surfaces (from 0 to 64) (default 0)
-cbr <boolean> E..V....... Use cbr encoding mode (default false)
-2pass <boolean> E..V....... Use 2pass encoding mode (default auto)
-gpu <int> E..V....... Selects which NVENC capable GPU to use. First GPU is 0, second is 1, and so on. (from -2 to INT_MAX) (default any)
any -1 E..V....... Pick the first device available
list -2 E..V....... List the available devices
-delay <int> E..V....... Delay frame output by the given amount of frames (from 0 to INT_MAX) (default INT_MAX)
-no-scenecut <boolean> E..V....... When lookahead is enabled, set this to 1 to disable adaptive I-frame insertion at scene cuts (default false)
-forced-idr <boolean> E..V....... If forcing keyframes, force them as IDR frames. (default false)
-spatial_aq <boolean> E..V....... set to 1 to enable Spatial AQ (default false)
-spatial-aq <boolean> E..V....... set to 1 to enable Spatial AQ (default false)
-temporal_aq <boolean> E..V....... set to 1 to enable Temporal AQ (default false)
-temporal-aq <boolean> E..V....... set to 1 to enable Temporal AQ (default false)
-zerolatency <boolean> E..V....... Set 1 to indicate zero latency operation (no reordering delay) (default false)
-nonref_p <boolean> E..V....... Set this to 1 to enable automatic insertion of non-reference P-frames (default false)
-strict_gop <boolean> E..V....... Set 1 to minimize GOP-to-GOP rate fluctuations (default false)
-aq-strength <int> E..V....... When Spatial AQ is enabled, this field is used to specify AQ strength. AQ strength scale is from 1 (low) - 15 (aggressive) (from 1 to 15) (default 8)
-cq <float> E..V....... Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control (from 0 to 51) (default 0)
-aud <boolean> E..V....... Use access unit delimiters (default false)
-bluray-compat <boolean> E..V....... Bluray compatibility workarounds (default false)
-init_qpP <int> E..V....... Initial QP value for P frame (from -1 to 51) (default -1)
-init_qpB <int> E..V....... Initial QP value for B frame (from -1 to 51) (default -1)
-init_qpI <int> E..V....... Initial QP value for I frame (from -1 to 51) (default -1)
-qp <int> E..V....... Constant quantization parameter rate control method (from -1 to 51) (default -1)
-weighted_pred <int> E..V....... Set 1 to enable weighted prediction (from 0 to 1) (default 0)
-b_ref_mode <int> E..V....... Use B frames as references (from 0 to 2) (default disabled)
disabled 0 E..V....... B frames will not be used for reference
each 1 E..V....... Each B frame will be used for reference
middle 2 E..V....... Only (number of B frames)/2 will be used for reference
-a53cc <boolean> E..V....... Use A53 Closed Captions (if available) (default true)
-s12m_tc <boolean> E..V....... Use timecode (if available) (default false)
-dpb_size <int> E..V....... Specifies the DPB size used for encoding (0 means automatic) (from 0 to INT_MAX) (default 0)
-multipass <int> E..V....... Set the multipass encoding (from 0 to 2) (default disabled)
disabled 0 E..V....... Single Pass
qres 1 E..V....... Two Pass encoding is enabled where first Pass is quarter resolution
fullres 2 E..V....... Two Pass encoding is enabled where first Pass is full resolution
-ldkfs <int> E..V....... Low delay key frame scale; Specifies the Scene Change frame size increase allowed in case of single frame VBV and CBR (from 0 to 255) (default 0)
対応
旧録画サーバーでは私がffmpegのコンパイルをミスっていたようで、-presetオプションが効きませんでした。
ですが、Ubuntu22.04の新しい録画サーバーに変更したら、すんなりこのオプションが効くようになりました。
以下のように-presetオプションでp5,p6,p7あたりかなと思います。
試しにp5でやってみたら、約13倍でエンコードできて、1時間の動画が900MBぐらいと、ファイルサイズもそれほど大きくなかったです。なので、当面はp5を指定して運用していきます。
-preset <int> E..V....... Set the encoding preset (from 0 to 18) (default p4)
p5 16 E..V....... slow (good quality)
p6 17 E..V....... slower (better quality)
p7 18 E..V....... slowest (best quality)
