{"id":10028,"date":"2022-06-21T09:10:42","date_gmt":"2022-06-21T09:10:42","guid":{"rendered":"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/documentation\/rdk_video_documentation\/components\/open-sourced_components\/advanced_adaptive_media_player_aamp\/aamp_adaptive_bitrate_behavior\/"},"modified":"2025-03-25T05:18:34","modified_gmt":"2025-03-25T05:18:34","slug":"aamp_adaptive_bitrate_behavior","status":"publish","type":"page","link":"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_video_documentation\/components\/advanced_adaptive_media_player_aamp\/aamp_adaptive_bitrate_behavior\/","title":{"rendered":"AAMP Adaptive Bitrate Behavior"},"content":{"rendered":"\n

Adaptive Bitrate (ABR) Manager<\/span><\/strong><\/p>

AAMP-ABR.pptx<\/a>Download<\/a><\/div> <\/span><\/span><\/span><\/strong><\/span><\/span><\/span><\/p>
  1. Initial bitrate is configurable for 4k and non-4k, based on a desired target bitrate. The profile with smallest bitrate >= that target is picked. If target bitrate is higher than all available bitrates, top profile is picked.
    1. Current defaults:<\/li>
    2. Initial bitrate: 2.5 mb – for non-4k playback<\/li>
    3. Initial bitrate for 4K playback: 13mb ie, 3\/4 profile<\/li><\/ol><\/li>
    4. As each fragment is downloaded, an estimated available bandwidth sample is computed and shared with ABR manager (total bytes \/ download time); configuration exists to exclude “too small” fragments from this sampling. <\/li>
    5. ABR manager filters “old” estimated bandwidth samples, using average recent bandwidth samples for its estimated effective bandwidth (threshold = 5s).<\/li>
    6. ABR manager will jump when detecting big swing in available bandwidth (allowing quick skip up\/down over other profiles).<\/li>
    7. ABR manager will more conservatively accommodate small shifts in available bandwidth (to avoid flipping up\/down if we’re on the edge); requiring multiple satisfying samples before ramping up\/down in this case<\/li>
    8. Upon initial tune, with healthy network, ramps to top profile will occur after playout of three fragments (typically 3*2s=6s) at initial profile<\/li>
    9. A “useNewABR” is recently introduced, to use a hybrid buffering\/throughput model.  This takes into account buffer health to avoid unnecessary rampdowns when buffer is healthy, along with a mechanism to escape “ABR valley” when buffers are healthy but throughput as measured appears poor.<\/li><\/ol>

      Configuration\/defaults:
      abr-cache-life=<x in sec> lifetime value for abr cache for network bandwidth calculation(default 5 sec)
      abr-cache-length=<x> length of abr cache for network bandwidth calculation (default 3)
      abr-cache-outlier=<x in bytes> Outlier difference which will be ignored from network bandwidth calculation(default 5MB)
      abr-nw-consistency=<x> Number of checks before profile incr\/decr by 1.This is to avoid frequent profile switching with network change(default 2)
      abr-skip-duration=<x> minimum duration of fragment to be downloaded before triggering abr (default 6 sec).<\/p>

      ABR Override<\/h3>

      with VBN build we can create\/use \/opt\/aamp.cfg to force a specific profile.  The relevant configuration options are:<\/p>

      <\/colgroup>
      abr <\/td>disable abr mode (defaults on)<\/td><\/tr>
      default-bitrate<\/td>specify initial bitrate while tuning, or target bitrate while abr disabled (defaults to 2500000)<\/td><\/tr>
      default-bitrate-4k<\/td>specify initial bitrate while tuning 4K contents, or target bitrate while abr disabled for 4K contents (defaults to 13000000)<\/td><\/tr><\/tbody><\/table> <\/div>

      For example:<\/strong><\/p>

      “`abr<\/p>

      default-bitrate=1200000“`<\/p>

      Will disable abr and use the explicitly specified bitrate.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Adaptive Bitrate (ABR) Manager Initial bitrate is configurable for 4k and non-4k, based on a desired […]<\/p>\n","protected":false},"author":28,"featured_media":0,"parent":10015,"menu_order":2,"comment_status":"open","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-10028","page","type-page","status-publish","hentry"],"yoast_head":"\nAAMP Adaptive Bitrate Behavior - RDK Documentation Portal | Documentation<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/developer.rdkcentral.com\/documentation\/documentation\/rdk_video_documentation\/components\/advanced_adaptive_media_player_aamp\/aamp_adaptive_bitrate_behavior\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AAMP Adaptive Bitrate Behavior - 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