Target options, Audio – Grass Valley ProCoder 3 User Manual

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ProCoder 3

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Using ProCoder

Helpful Hints

ProCoder

Reference

Glossary

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141

Target Options

Max keyframe interval

Sets the maximum keyframe interval. This is the maximum number of frames
between keyframes. Some codecs will still insert additional keyframes if there is a
large change in the video content so keyframes may occur more frequently than the
interval set here.
In temporal compression, most frames of video are represented as the change from
a previous frame. Keyframes are full independent video frames in the output. Having
more keyframes generally results in better video quality but creates larger files when
bitrate is not constrained. When bitrate is constrained, more keyframes provides
better random access and higher fault-tolerance, but too many keyframes can reduce
video quality.

Audio

Audio Encoder Type

Select the audio encoder to use. DirectShow codecs appear in the drop-down list. To
use older ACM (Video for Windows-compatible) codecs, select ACM codecs... from
the drop-down list and choose the ACM codec in the ACM Driver field.

ACM Driver

Select the ACM driver to use for audio compression. This option only appears if ACM
codecs... is selected for the Audio Encoder Type.

Format Type

Some ACM drivers support more than one compression algorithm. Select the audio
format to use. This option only appears if ACM codecs... is selected for the Audio
Encoder Type.

Format

If the the audio compressor supports multiple predefined audio formats (sampling
rate, bits / sample, channels), select the desired format here.

Quality

Sets the quality level for audio encoding. The higher the quality level, the better the
output will sound but encoding will take longer. If the codec allows specification of
both quality and bitrate, the combination of both settings will determine the audio
quality of the final output.

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