QVidium QVSD - Manual (Page 36)

User‟s Manual v.3 QVidium
®
QVSD H.264 SD Video Codec™
Copyright 2011 QVidium
®
Technologies, Inc.Page 36 of 53
10
Known Problems
The following problems are currently known to exist:
Encoder:
1. Only outputs VBR (variable bit rate). CBR (constant bit rate is not yet implemented).
2. Closed Captioning (CC) is only partially implemented for SD MPEG2 video.
3. Setting the number of Audio Channels to 1 may cause the encoder to unexpectedly
halt.
4. DVB-ASI output is not yet implemented.
5. Dolby AC3 encoding only available upon special request.
6. Encoding an SD video input may unexpectedly stop (and be restarted if error handling
is set).
7. The output bitrate may exceed the selected VBR peak bitrate.
Decoder:
1. Dolby AC3 decoding only available upon special request.
2. Closed Captioning is not yet supported.
3. ASI input is not yet implemented.
4. Interlaced output resolutions are not currently working properly.
Transcoding:
1. ASI interfaces are not currently implemented.
2. Transcoding is limited to the first 2 audio channels, others are discarded.
3. Closed Captioning and Tele-text are not currently supported. (However, subtitle pass-
through is supported for IP output.)
Note: You can simultaneously run the encoder and decoder for full-duplex operation when
encoding and decoding SD video and when the encoder ARQ buffers are set to 1024.
However, you may have to restart the decoder if you restart the encoder.
Warning: Running more than two of any of these operations at the same time may not work
or may require restarting of one of the previously started functions. QVidium does
NOT warrant operation when starting more than two of the 3 modes of operation -
encoding, decoding, and transcoding at the same time, or running multiple
operations when there could be a conflict in resources.