X4

MPEG-4 encoder settings 383
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GOP structure
Max GOP length
Determines the maximum GOP (view page 394) length. High values mean
improved compression. L
ower values create stronger security protection and
enable improved access to individual frames for processing the video.
Max b-frames count
The maximum number of b-frames (view page 396). Several cases of
application, e
.g. video conferences require "no b-frames" in order to achieve
the shortest possible reaction times during transfer.
Scene change detection
If this option is activated the scenes will be detected during encoding, thus
allowing you to insert an I frame (view page 395) after a scene change.
Input info
Information about the incoming video stream is displayed here during live
recordings.
Statistics
Information about the encoder activity is displayed here during live recordings.
AMR
AMR involves a parametric codec with different data rates between 4.75 and
12.2 kbit/s. The 12.2-kbit/s setting roughly corresponds with the GSM-EFR
codec in terms of algorithm and audio quality.
This audio format is used by mobile telephones for transferring the
conversation and is optimized for encoding conversation (voices). Low bit rates
provide compensation for mobile phones in case of transfer errors, i.e. bad
reception. Depending on the signal strength, the compression increases or
decreases to enable the best possible quality for a conversation. The AMR
sound, on the other hand, encodes a fixed sample rate of 8,000 Hz compared
to AAC sound.
The advanced AMR audio menu includes the following settings options:
The bit rate can be set between 4.75 and 12.2kbit/s. The higher the bit rate,
the greater the file size and the higher level of audio quality. The standard