Unify keyframe interval to 60 frames for NVENC H264/H265 encoder paths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Budovi

server/internal/config/capture_pipeline.go

@@ -162,7 +162,7 @@ func NewVideoPipeline(rtpCodec codec.RTPCodec, display string, pipelineSrc strin
 				return "", err
 			}
 
-			pipelineStr = fmt.Sprintf(videoSrc+"video/x-raw,format=NV12 ! nvh264enc name=encoder preset=2 gop-size=25 spatial-aq=true temporal-aq=true bitrate=%d vbv-buffer-size=%d rc-mode=6 ! h264parse config-interval=-1 ! video/x-h264,stream-format=byte-stream,profile=constrained-baseline"+pipelineStr, display, fps, bitrate, vbvbuf)
+			pipelineStr = fmt.Sprintf(videoSrc+"video/x-raw,format=NV12 ! nvh264enc name=encoder preset=2 gop-size=60 spatial-aq=true temporal-aq=true bitrate=%d vbv-buffer-size=%d rc-mode=6 ! h264parse config-interval=-1 ! video/x-h264,stream-format=byte-stream,profile=constrained-baseline"+pipelineStr, display, fps, bitrate, vbvbuf)
 		default:
 			// https://gstreamer.freedesktop.org/documentation/openh264/openh264enc.html?gi-language=c#openh264enc
 			// gstreamer1.0-plugins-bad
@@ -204,7 +204,7 @@ func NewVideoPipeline(rtpCodec codec.RTPCodec, display string, pipelineSrc strin
 				return "", err
 			}
 
-			pipelineStr = fmt.Sprintf(videoSrc+"video/x-raw,format=NV12 ! nvh265enc name=encoder rc-mode=cbr preset=p2 tune=low-latency gop-size=25 bitrate=%d vbv-buffer-size=%d ! h265parse config-interval=-1 ! video/x-h265,stream-format=byte-stream,profile=main"+pipelineStr, display, fps, bitrate, vbvbuf)
+			pipelineStr = fmt.Sprintf(videoSrc+"video/x-raw,format=NV12 ! nvh265enc name=encoder rc-mode=cbr preset=p2 tune=low-latency gop-size=60 bitrate=%d vbv-buffer-size=%d ! h265parse config-interval=-1 ! video/x-h265,stream-format=byte-stream,profile=main"+pipelineStr, display, fps, bitrate, vbvbuf)
 		default:
 			// https://gstreamer.freedesktop.org/documentation/x265/index.html?gi-language=c
 			// gstreamer1.0-plugins-bad