fw/nix
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

added hardware encoding

Browse source
This commit is contained in:
fwastring 2026-03-29 15:17:22 +02:00
parent 56d2144bcc
commit 966970c256
2 changed files with 131 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

127
moduler/services/webcam-rtsp/default.nix
View file

@ -18,6 +18,13 @@ let
rtspUrl = cfg.rtspUrl;
framerate = cfg.framerate;
videoSize = cfg.videoSize;
preset = cfg.preset;
bitrateKbps = cfg.bitrateKbps;
maxrateKbps = cfg.maxrateKbps;
bufsizeKbps = cfg.bufsizeKbps;
useVaapi = cfg.useVaapi;
vaapiDevice = cfg.vaapiDevice;
vaapiQp = cfg.vaapiQp;
};
};
@ -47,6 +54,51 @@ in
default = "1280x720";
description = "Input video size for the webcam stream.";
};
preset = mkOption {
type = types.enum [
"ultrafast"
"superfast"
"veryfast"
"faster"
"fast"
"medium"
"slow"
"slower"
"veryslow"
];
default = "veryfast";
description = "x264 preset used for software encoding.";
};
bitrateKbps = mkOption {
type = types.nullOr types.int;
default = null;
description = "Target bitrate in kbps. Set to null for CRF-like unconstrained output.";
};
maxrateKbps = mkOption {
type = types.nullOr types.int;
default = null;
description = "Maximum bitrate in kbps. Defaults to bitrateKbps when unset.";
};
bufsizeKbps = mkOption {
type = types.nullOr types.int;
default = null;
description = "Rate-control buffer in kbps. Defaults to 2x bitrateKbps when unset.";
};
useVaapi = mkOption {
type = types.bool;
default = false;
description = "Use VAAPI hardware encoding (h264_vaapi) instead of libx264.";
};
vaapiDevice = mkOption {
type = types.str;
default = "/dev/dri/renderD128";
description = "VAAPI render device path used when useVaapi = true.";
};
vaapiQp = mkOption {
type = types.int;
default = 24;
description = "VAAPI quality parameter (lower means better quality, higher CPU/bitrate).";
};
streams = mkOption {
type = types.attrsOf (
types.submodule {
@ -69,6 +121,51 @@ in
default = "1280x720";
description = "Input video size for this stream.";
};
preset = mkOption {
type = types.enum [
"ultrafast"
"superfast"
"veryfast"
"faster"
"fast"
"medium"
"slow"
"slower"
"veryslow"
];
default = "veryfast";
description = "x264 preset used for software encoding.";
};
bitrateKbps = mkOption {
type = types.nullOr types.int;
default = null;
description = "Target bitrate in kbps. Set to null for unconstrained output.";
};
maxrateKbps = mkOption {
type = types.nullOr types.int;
default = null;
description = "Maximum bitrate in kbps. Defaults to bitrateKbps when unset.";
};
bufsizeKbps = mkOption {
type = types.nullOr types.int;
default = null;
description = "Rate-control buffer in kbps. Defaults to 2x bitrateKbps when unset.";
};
useVaapi = mkOption {
type = types.bool;
default = false;
description = "Use VAAPI hardware encoding (h264_vaapi) instead of libx264.";
};
vaapiDevice = mkOption {
type = types.str;
default = "/dev/dri/renderD128";
description = "VAAPI render device path used when useVaapi = true.";
};
vaapiQp = mkOption {
type = types.int;
default = 24;
description = "VAAPI quality parameter for h264_vaapi.";
};
};
}
);
@ -81,6 +178,27 @@ in
config = mkIf cfg.enable {
systemd.services = mapAttrs' (
streamName: streamCfg:
let
maxrateKbps =
if streamCfg.maxrateKbps != null then streamCfg.maxrateKbps else streamCfg.bitrateKbps;
bufsizeKbps =
if streamCfg.bufsizeKbps != null then
streamCfg.bufsizeKbps
else if streamCfg.bitrateKbps != null then
streamCfg.bitrateKbps * 2
else
null;
rateControlArgs =
if streamCfg.bitrateKbps != null then
"-b:v ${toString streamCfg.bitrateKbps}k -maxrate ${toString maxrateKbps}k -bufsize ${toString bufsizeKbps}k"
else
"";
videoCodecArgs =
if streamCfg.useVaapi then
"-vaapi_device ${streamCfg.vaapiDevice} -vf format=nv12,hwupload -c:v h264_vaapi -qp ${toString streamCfg.vaapiQp}"
else
"-vcodec libx264 -tune zerolatency -preset ${streamCfg.preset}";
in
nameValuePair "webcam-rtsp-publisher-${sanitizeName streamName}" {
description = "Publish webcam stream '${streamName}' to MediaMTX over RTSP";
wantedBy = [ "multi-user.target" ];
@ -91,14 +209,7 @@ in
Type = "simple";
Restart = "always";
RestartSec = "2";
ExecStart = ''
${pkgs.ffmpeg}/bin/ffmpeg \
-hide_banner -loglevel warning \
-f v4l2 -framerate ${toString streamCfg.framerate} -video_size ${streamCfg.videoSize} \
-i ${streamCfg.device} \
-vcodec libx264 -tune zerolatency -preset veryfast \
-f rtsp ${streamCfg.rtspUrl}
'';
ExecStart = "${pkgs.ffmpeg}/bin/ffmpeg -hide_banner -loglevel warning -f v4l2 -framerate ${toString streamCfg.framerate} -video_size ${streamCfg.videoSize} -i ${streamCfg.device} ${videoCodecArgs} ${rateControlArgs} -f rtsp ${streamCfg.rtspUrl}";
};
}
) effectiveStreams;