Don’t wait until you get to the field to test your video material! The most common cause of technical support calls is faulty video encoding. In order to guarantee reliable, repeatable performance, the audio and video MUST be encoded and multiplexed precisely. We encourage you to use a service with Alcorn McBride encoding experience. They know how to make video that plays perfectly, stays in sync and looks its best. And our tech support department will thank you!
Encoded files must comply to ISO/IEC Specification 13818-2
MPEG2 files must be encoded as a Transport Stream.
Elementary Video stream must be Main Profile High Level MP@HL 4:2:0.
Elementary Audio Stream is required and must be AC3 or MPEG1 layer II encoded. Bitrates of 192, 224, or 384 kbps are supported.
Source audio before encoding is 16 bit at 48 or 44.1 kHz sample rate.
Transport stream packet size is 188 bytes or 224 bytes.
Stream must start with an I frame and finish on a 188 bytes packet boundary.
The two main resolutions supported are 1920 x 1080 x 29.97 (or 30) interlace and 1280 x 720 x 59.94 (or 60) progressive.
Recommended Video PID numbers are 0x11, 0x21 & 0x31. Audio PID numbers are video PID +3. Try to ensure that all files are encoded with the same PID. We Typically use 0x31 which is 49 in decimal.
ATSC bit rate is 19.39Mb/s. Higher bit rates up to 50Mb/s can be accommodated.
Constant Bitrate (CBR) or Variable Bitrate (VBR)
Group of Picture (GOP) Structure is CLOSED.
Normally 13 or 15 frames / GOP.
I B & P frames will provide the most efficient compression.
Preferably each GOP will contain a sequence header.
Orlando, FL 32835