Fix H265 support from OpenIPC project

pkg/h265/rtp.go

@@ -55,6 +55,14 @@ func RTPDepay(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc {
 			case 1: // end
 				buf = append(buf, data[3:]...)
 				binary.BigEndian.PutUint32(buf[nuStart:], uint32(len(buf)-nuStart-4))
+			case 3: // wrong RFC 7798 realisation from OpenIPC project
+				// A non-fragmented NAL unit MUST NOT be transmitted in one FU; i.e.,
+				// the Start bit and End bit must not both be set to 1 in the same FU
+				// header.
+				nuType = data[2] & 0x3F
+				buf = binary.BigEndian.AppendUint32(buf, uint32(len(data))-1) // NAL unit size
+				buf = append(buf, (data[0]&0x81)|(nuType<<1), data[1])
+				buf = append(buf, data[3:]...)
 			}
 		} else {
 			nuStart = len(buf)