---
title: "Device Info"
slug: "device-info"
updated: 2023-10-04T01:04:47Z
published: 2023-10-04T01:04:47Z
canonical: "docs.viewlift.com/device-info"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.viewlift.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Device Info

Use the **Quality of Service** > **Device Info** reports for viewing streaming latency by device. Set a time range and pivot reports by OS, Browser, and Device Name.

![](https://cdn.document360.io/15e0c142-c823-4c77-a8e8-9d32ca937982/Images/Documentation/failed-streams.png)Roku and iOS apps showing a drastic increase in “Failed stream starts”

| **Metric** | **Description** |
| --- | --- |
| **Buffering Ratio** | Indicates the quality of the playback experience. Buffering is what happens when a video player fails to pre-load a sufficient amount of content data and the playhead stops in-stream to load more content. |
| **Time To First Byte** | TTFB is the time (calculated in seconds) the player takes to load content and when it starts to render. The following steps are involved in loading the video on a player: **Step 1**. Loading master-manifest file(m3u8) (e.g. https://cdn-ue1-prod.tsv2.amagi.tv/avod/viewlift-xxxx-yyyy/L24-114-OTT/L24-114-OTT.m3u8) **Step 2**. Loading sub-manifest file(m3u8) mentioned inside the master-manifest file. sub-manifests are bitrate/resolution-specific playlists and will be selected by the player based on the bandwidth and other parameters. **Step 3**. Loading the video segments mentioned inside the sub-manifest file. So TTFB is equal to the sum of time taken in the above 3 steps. TTFB also depends on the user’s network conditions, as well as whether the video segment has recently been cached at the CDN[](https://medium.com/vimeo-engineering-blog/one-ai-streaming-videos-for-all-aeaedb8e5378). |
| **# Dropped Streams** | If an error occurs at some point after playing a video and playback stops, that's counted as “Dropped Stream”, but if the video failed to even start and did not play for even a second, it's counted as “Failed Start”. This may indicate some crash issues on the problematic platform. |
| **# Failed Stream Starts** | See the definition above. |
| **Average Resolution** | Indicates the video quality on the device platforms your apps are on. See the "Average Resolution" for the Roku device in this example screenshot. The quality has averaged SD-quality video over this time period. ![](https://cdn.document360.io/15e0c142-c823-4c77-a8e8-9d32ca937982/Images/Documentation/image-1690732111937.png) |

### Browser

Get the QoS reports for the metrics by browser. ![](https://cdn.document360.io/15e0c142-c823-4c77-a8e8-9d32ca937982/Images/Documentation/image-1654674858491.png)

### Device Name

Get the QoS reports for the metrics by device name.

![](https://cdn.document360.io/15e0c142-c823-4c77-a8e8-9d32ca937982/Images/Documentation/image-1654675229118.png)