Many modern devices like TV Tuners, HDV camcorders, and IP cameras have a Hardware MPEG Encoder.
The different program often installs their decoders for MPEG-2/4. You can select the decoders being used for video and audio instead of the default ones.
It will allow you to avoid decoding problems if the quality of the default decoders is low. Use the MPEG_Video_Decoder and MPEG_Audio_Decoder parameters to select the necessary decoders.