User`s manual

User’s Manual v.13 QVidium
®
H.264 HD Video Codecs™
Copyright 2011-2013 QVidium
®
Technologies, Inc. Page 25 of 67
Video Aspect Ratio: This sets a bit in the video stream to tell the display device what output
aspect ratio to display.
Number P Frames: This sets the number or Predictive frames in the Group-of-Pictures (GOP).
Unless you need a specific GOP, you should set this to Auto.
Number B Frames: This sets the number of Bi-Directional frames in the GOP. Unless you
need a specific GOP, you should set this to Auto. The GOP can be calculated by the formula:
GOP = (P+1)*(B+1).
Thus, for all I-Frames (GOP=1), you would set P=0 and B=0. For Baseline Profile, the B
parameter is ignored (internally set to 0).
MPEG4 Profile and Level: This sets the H.264 profile and level. Auto uses the best possible
encoding for the given parameters. Use this for backward compatibility with decoders that
cannot handle the more advanced encoding features. If you see jerky video on a decoder and
there is no packet loss and the CPU is not overloaded, then you may want to try lower values
for these settings.
Control Parameters:
Error Handling (IP output only): Enable this feature when high reliability is required. When
set to Reboot or Restart, this feature starts a supervisory monitoring process that will reboot or
restart the encoder when the encoder halts for any reason. Restarting the encoder is very fast
(less than a second), but may not recover from all types of errors. Restarting can take up to 23
seconds, but will recover from nearly any error.
Resync SDI and Resync HDMI: Forces the encoder to restart when detecting lose of lock on
the specified input signal. Enable if encoder loses sync when the input is interrupted. This
feature is no longer necessary for the QVPRO and can be set to No.
Output Parameters:
Program, PMT, Video, Audio, and PCR PID: Changing these values changes the values for
the respective PIDs. (Warning: setting the Program PID is currently not yet implemented, but
should be available in an upcoming firmware release.)
Network Parameters:
TS packets per IP packet: This sets the number of 188-byte MPEG-2 transport stream
packets per UDP/IP output packet payload. The default of 7 sets the payload to 1316 bytes,
minimizing the IP packetization overhead. A lower value results in a higher output packet rate.
Use Pacing: Because the video stream’s I-Frame (Key Frame) may generate a large burst of
IP packets, even a CBR stream may appear in bursts. Pacing adds a gated output buffering
(and therefore delay) to regulate the output packet rate and equalize the output packet
spacing, thereby smoothing fluctuations in the output rate. Pacing reduces packet loss over
some Internet connections, and improves performance in equipment with limited IP buffering
capacity.
Send SAP Announcement and SAP Session Name: Session Announcement Protocol or
SAP sends a broadcast packet so that SAP-enabled decoders and viewers (such as Elecard
Player from www.elecard.com) can maintain a list of currently playing video feeds, to allow you
to more easily manage and choose among multiple program feeds. You can supply a short
description of the video feed as the SAP Session Name. This only works for multicast RTP
streams.
Insert Metadata and Metadata UDP Port: Metadata is user-generated data that you can
supply and insert into the MPEG2 Transport Stream. When enabled, the QVPRO will listen for
UDP packets on the specified metadata UDP port and insert the payload of these packets into