Configure settings for H.264 video

Important: These options pertain only to video encoded with the H.264 codec. Use these options carefully. The settings affect the way that Flash Media Live Encoder uses the CPU and memory. These settings persist until the next time you readjust them.
  1. With H.264 selected, click the settings icon  next to the Video Format box.

  2. In the Advanced Encoder Settings dialog box, configure any of the following settings:

    Select either the Baseline or Main profile.

    The Baseline profile is commonly used in video conferencing, mobile applications, or other applications which operate with limited processing power, storage capacity, and bandwidth. The Main profile is appropriate for applications that broadcast media, such as network broadcasting, and requires 1.5% more processing power than the Baseline profile.

    Flash Media Live Encoder supports all available levels. Here are some examples of the resolution and frame rate achieved with different levels:



    Maximum resolution (width x height)

    Frame rate (frames per second)

    Standard definition


    352 x 288

    30 fps

    Standard definition


    720 x 576

    25 fps

    High definition


    1280 x 720

    30 fps

    High definition


    1920 x 1088

    120.5 fps

    Encoding with the H.264 codec is CPU-intensive. Adobe recommends that you select a level and video size that enables CPU usage to remain below 75% during encoding.

    For more information on H.264 profiles and levels, see commonly available resources about the H.264 video codec, such as the ISO/IEC 14496-10 standard on the ISO website and Wikipedia.

    Keyframe frequency
    The interval at which to insert keyframes. The default is 5 seconds, which means a keyframe is inserted every 5 seconds.