User`s manual

User’s Manual v.13 QVidium

H.264 HD Video Codecs™

Technologies, Inc. Page 51 of 67

for SDI input to Yes.

Encoding with SDI or HDMI input loses sync when video input is switched or interrupted

The encoder only synchronizes to the first few frames when encoding is started. It does not

monitor for changes in the video signal. To detect changes in the video input and force the

encoder to resync automatically, please enable either Resync HDMI or Resync SDI under

the Advanced encoder profile tab.

Cannot get decoder to display video

1. Use network monitor software on look for blinking link lights to be certain that the encoder is

sending packets to your decoder. If not, follow the steps for “Cannot get encoder to send

IP packets”. .

2. Make certain that device is powered on and connected to your network.

3. Check that green LAN light in front is lit and link light at RJ-45 port is on.

4. Try pinging the encoder by entering the IP address for the source device. For a H.264 HD

Video Codec™, try clicking on “Network/Ping”.

5. Make certain that both encoder and decoder are set to the same transport type (ARQ, RTP,

or UDP). For a Set-Top Box, such as an Amino, make certain that the encoder is set to

Transport & UDP.

6. Make certain that the encoder is not sending CIF or SIF resolution. The decoder can only

decode “FULL” or HD resolutions. The decoder cannot scale the incoming video

resolution.

Color loss on decoded video

a. Network losses or other interruptions that can cause breaks in the input video stream may

cause the decoder to lose sync and get into a state where it cannot decode color, resulting

in a complete loss of color on the decoded video output.

b. To help increase the tolerance of the decoder to these issues, try increasing the Video

Buffer Size to a minimum of 500 ms, or increasing it up to 1000 ms.

c. Enable “Detect Video Break” so that the decoder will restart when it detects a break in the

packet stream to help prevent the decoder from getting into a bad state.

Audio pauses, clicks, or gaps or video freezes during decoding

Excessive network jitter, such as on satellite, long-distance Internet, or 3G wireless links,

can result in pauses or short gaps or clicks in the audio output. To fix this, increase the

size of the decoder’s Video Input Buffer Size to buffer out any excessive jitter on the

video input stream.

Audio distortion

A tinny or metallic quality to the audio or a distortion that seems to appear only during

periods of relatively louder audio passages can be the result of clipping of the input audio

signal. This occurs when the input audio signal level exceeds the voltage level limits of the

audio input circuitry. To fix this problem, increase the audio attenuation in the Volume

control on the Encoder when the encoder is running, until the distortion is gone.

Other problems with encoding and decoding video