9.3 Recording Archive
Video recordings of monitoring objects are stored in the archive. The archive supports two viewing modes:
- Single — view recordings for one monitoring object at a time.
- Mosaic — view recordings for multiple monitoring objects simultaneously (up to 16 objects), using static or dynamic mosaics.
For recordings to be available, a recording template must be assigned in the monitoring object configuration (see Section 5.4). Alarm event data is stored alongside recordings and displayed on the timeline in Single mode.
To open the archive, go to the Retrospectives screen, navigate to the Recording section, and select Archive.
The archive screen contains three sections:
- Archive — list of available recordings, showing object name, node, and tags.
- Player — plays the selected timeline fragment; also used for cell template selection, fragment export, and queue management.
- Timeline — used to select a fragment for playback or export.
Single Mode
In Single mode, click the Single button and select a monitoring object from the list. Available recordings are shown as a green stripe on the timeline (Figure 244). Set the time interval to display using the time control bar at the top of the timeline — operation is identical to Section 9.1 (Table 35).
Figure 244. Screen for working with the archive of monitoring object records
To show alarm events on the timeline, click 
. Events are color-coded by their highest priority at each moment.
Selecting a Fragment
To select a fragment for playback or export, hold the left mouse button and draw a rectangle over the recording stripe on the timeline (shown by the red arrow in Figure 244). The selected fragment is highlighted as shown in Figure 245. To scale the selection to fill the entire timeline, click 
.
Figure 245. Timeline
The selected fragment is displayed in the player (Figure 246). Player controls are standard (play, stop, rewind, etc.).
Figure 246. Player management window
Cell Template
The player renders the image using a mosaic cell template (see Section 6.5.2). Select a template using the bar shown in Figure 247 — the chosen template also applies when exporting.
Figure 247. Cell template selection field
Exporting a Fragment
To queue a fragment for export, click 
. Before the task is added, an export configuration window opens (Figure 248).
Figure 248. Fragment export configuration window
Select the Exporting mode:
- Original — export as saved in the archive, in accordance with the recording template (see Section 5.4).
- Transcoding — re-encode with modified compression settings.
For Transcoding mode, configure the following parameters (availability depends on selected settings):
- Decoder library — ffmpeg, Intel, or CUDA.
- Deinterlacing — Disabled, Blend (interpolate frames), or Median (median filter).
- Decoder GPU socket — GPU socket for decoding; distributes computational load.
- Target Width / Height — output image dimensions in pixels.
- Target Aspect — output aspect ratio.
- Video Bitrate — encoder output bitrate.
- Video Encoder — select from list.
- Video Profile — encoding profile; select from list.
- Codec Preset — encoder preset affecting speed/quality ratio and delay; select from list.
- Coder GPU socket — GPU socket for encoding; distributes computational load.
- Audio Encoder — AAC or MPEG Audio.
- Audio Bitrate — encoder output audio bitrate.
Note: Rendering here refers to recalculating the image to match the selected mosaic cell template.
Export Queue
To open the export queue panel, click 
. The panel is shown in Figure 249.
Figure 249. Fragments export panel
Table 37. Export task control buttons
| Button | Description |
|---|---|
 |
Play the prepared fragment in the player. |
 |
Download the prepared fragment to the workstation. |
 |
Copy the download link to the clipboard. The fragment is stored on the web server and can be downloaded via this link (the web server must be accessible from the workstation). |
 |
Open the export configuration window to change parameters. Re-preparation may be required after changes. |
 |
Delete the prepared fragment. |
Mosaic Mode
In Mosaic mode, click the Mosaic button. The Archive panel on the left shows a list of mosaics (static and dynamic) with their monitoring objects. Expand a mosaic to see the objects it contains. Mosaics are configured in the mosaic editor (see Section 6.5.3).
The mosaic list shows the following columns:
- Name — mosaic or monitoring object name. Click
to expand a mosaic. - In the expanded list:
indicates recording is enabled; 
indicates recording is disabled. - Node — node where the monitoring object and mosaic are hosted.
- URL — source URL of the monitoring object.
Set the time interval using the time control bar at the top of the timeline. To select a fragment, draw a rectangle on the timeline (Figure 250) — operation is identical to Single mode.
Figure 250. Screen for working with the mosaic records archive
Use the player controls 
to play back the selected fragment.
Note
- Audio playback is not available in Mosaic mode.
- Export of mosaic recordings is not supported in Mosaic mode.
- If recording is disabled for a monitoring object, a black screen is shown for that object during playback.
- Up to 16 objects can be viewed simultaneously.
Archive Transcoding Settings
The compression and transcoding scheme for archive viewing is shown in Figure 251.
Figure 251. Compression and transcoding scheme when working with an archive
This section covers transcoding settings for viewing archive content. For recording template configuration, see Section 5.4. For export transcoding settings, see the Export Queue section above.
To open transcoding settings, go to the Retrospectives screen and select Settings in the Recordings section (Figure 252).
Configure the following parameters:
- Decoder library — ffmpeg, Intel, or CUDA.
- Deinterlacing — Disabled, Blend, or Median.
- Video accelerator — GPU socket for decoding.
- Encoder preset — choose from available presets (configured in Section 5.4.1). For optimal performance in Mosaic mode, set maximum resolution in the archive player encoder to no more than 1280×720.
Figure 252. Transcoding settings screen for viewing