Using Advanced MPEG-2 Encoding Options

Our MPEG-2 encoder offers advanced encoding parameters for both GOP structure and cadence. Closed GOPs with scene detection are ideal for delivery to many STBs (Set-Top-Boxes), such as Tivo and Roku. The Strict GOPs option locks the size to your keyframe value, and is necessary for some hardware DRM solutions. We also now provide MPEG-2 keyframe presets for both DVD and Long-GOP output, as well as the option to turn B-frames on/off. This greatly increases compatibility with a wide range of MPEG-2 players and chipsets.

MPEG-2 API options

Here are all the accepted values for our API

<output>mpeg2</output>  
<keyframe>[12|15|25|30]</keyframe><!--GOP length for NTSC/PAL-->
<bframes>[2|0]</bframes><!--bidirectional frames-->
<gop>[cgop|sgop]</gop><!--closed or strict GOP-->   
</output>

MPEG-2 Advanced XML Samples

Sample for Tivo and NTSC DVD output

Closed 15-frame GOP using standard IPBBPBBP cadence.

<output>mpeg2</output>  
<keyframe>15</keyframe>   
<bframes>2</bframes>  
<gop>cgop</gop>   
</output>

Sample for PAL DVD output

Closed 12-frame GOP using standard IPBBPBBP cadence.

<output>mpeg2</output>  
<keyframe>12</keyframe>   
<bframes>2</bframes>  
<gop>cgop</gop>   
</output>

Sample for Cablelabs Broadcast NTSC output

Long 30-frame GOP using broadcast IPPPPPPP cadence.

<output>mpeg2</output>  
<keyframe>30</keyframe>   
<bframes>0</bframes>  
<gop>cgop</gop>   
</output>