Preset options for Video


    Depending on the preset you've selected, the Video transcode settings contain some or all of the following options:

    Quality

    Specifies the encoding quality. Quality values range from 1-5, with higher values increasing quality and render time.

    Aspect Ratio

    Specifies the output aspect ratio of either 4:3 or 16:9.

    Frame Rate

    Displays the output frame rate for either NTSC or PAL formats.

    Program Sequence

    Specifies the output scan mode, interlaced, or progressive.

    Field Order

    Only appears if you select Interlaced as the Program Sequence option. Specifies the output field order, Upper or Lower.

    Bitrate Encoding

    Specifies the compression technique used. Constant Bit Rate (CBR) compresses data to a fixed rate. CBR keeps the rate constant by varying the amount of compression (and thereby quality) as required by the specified data rate. Variable Bit Rate (VBR) compresses data to fit between a fixed minimum and fixed maximum rate. VBR allows the compression to vary, which can result in better quality than CBR.

    M frames

    Specifies the number of B frames between consecutive I and P frames.

    N frames

    Specifies the number of frames between I frames. This value must be a multiple of the M frames value.

    Bitrate

    Only appears if you select CBR as the Bitrate Encoding option. Specifies the number of megabits per second you want the encoded file to have.

    The following options appear only if you select VBR as the Bitrate Encoding option:

    Encoding Passes

    Enabled for VBR only. Specifies the number of times the encoder will analyze the clip before encoding.

    Target Bitrate

    Specifies the number of megabits per second you want the encoded file to have. (See Understanding bit budgeting.)

    Maximum Bitrate

    Specifies the maximum number of megabits per second you want the encoder to allow. 9.8 Mbps is the maximum allowable rate, allowing a bit of a safety margin.

    Minimum Bitrate

    Specifies the minimum number of megabits per second you want the encoder to allow. The minimum bit rate must be at least 1.5 Mbps.