Composite media session statistics

Overview

When a stream is transcoding on Transcoder node to play it as ABR, the media session between Transcoder and Edge includes a number of media streams, one per video profile. In this case, the media session is a composite one.

The composite media session was introduced in CDN 2.1. Since build 5.3.265 composite media session state, logs and statistics are available via REST API /rest-api/v3/stream_composite/find query

Composite media session REST API

The REST API details available here

Get the media session data and logs

POST /rest-api/v3/stream_composite/find HTTP/1.1
HOST: localhost:8081
Content-Type: application/json

{
    "name": "test-HLS-ABR-STREAM",
    "offset": 0,
    "size": 50
}

{
    "name": "test-HLS-ABR-STREAM",
    "profiles": [
        "0x240-500 Kbps",
        "0x480-1000 Kbps",
        "0x720-1.5 Mbps",
        "0x1080-2 Mbps"
    ],
    "logs": [
        "2025-12-17T13:25:08.826 WARNING: Profiles out of sync",
        [
            "0x1080-2 Mbps, 0, 0, 0, 0",
            "0x720-1.5 Mbps, 0, 0, 0, 0",
            "0x480-1000 Kbps, 0, 0, 0, 0",
            "0x240-500 Kbps, -7, +0, -234, +0"
        ],
        "2025-12-17T13:25:18.826 WARNING: Track(s) saturation rate is unsatisfactory",
        [
            "(0x1080-2 Mbps) received 922 frames. Expected 1077",
            "(0x240-500 Kbps) received 1187 frames. Expected 1077",
            "(0x480-1000 Kbps) received 1211 frames. Expected 1077"
        ],
        "2025-12-17T13:25:18.827 WARNING: Profiles out of sync",
        ...
    ]
}

Get all the media sessions data and logs

POST /rest-api/v3/stream_composite/find_all HTTP/1.1
HOST: localhost:8081
Content-Type: application/json

{
    "offset": 0,
    "size": 50
}

[
    {
        "name": "test-HLS-ABR-STREAM",
        "profiles": [
            "0x240-500 Kbps",
            "0x480-1000 Kbps",
            "0x720-1.5 Mbps",
            "0x1080-2 Mbps"
        ],
        "logs": [
            "2025-12-17T13:25:08.826 WARNING: Profiles out of sync",
            [
                "0x1080-2 Mbps, 0, 0, 0, 0",
                "0x720-1.5 Mbps, 0, 0, 0, 0",
                "0x480-1000 Kbps, 0, 0, 0, 0",
                "0x240-500 Kbps, -7, +0, -234, +0"
            ],
            "2025-12-17T13:25:18.826 WARNING: Track(s) saturation rate is unsatisfactory",
            [
                "(0x1080-2 Mbps) received 922 frames. Expected 1077",
                "(0x240-500 Kbps) received 1187 frames. Expected 1077",
                "(0x480-1000 Kbps) received 1211 frames. Expected 1077"
            ],
            "2025-12-17T13:25:18.827 WARNING: Profiles out of sync",
            ...
        ]
    },
    ...
]