Video examination considers the image, technical properties and recording conditions. To answer questions about events, it is important to preserve the frame sequence and information about file transformations.
Subject of examination
- The video file and individual frames in context
- Resolution, frame rate and time data
- Capture conditions, transcoding and available versions
Sample questions for the expert
- What properties and limitations does the submitted video recording have?
- Which events and object features are discernible, given the quality?
- Are there signs of transformation or inconsistency?
- Are the data sufficient to answer questions about the timing and sequence of the event?
The final questions are formulated according to the objects and circumstances of the particular task.
What to prepare
- The source export from the camera or surveillance system
- Information about the device, time settings and export method
- The full interval before and after the disputed event
- Available diagrams, file versions and the questions posed
How the examination is conducted
Technical parameters, image quality and capture conditions are assessed. Extracted frames are considered in relation to the sequence and limitations of the source recording.
Scope and limitations
Improving visibility does not create missing details. Identification of a person, speed calculations and dimension measurements may require separate methods and source data.
What the deliverable records
The result shows which features are supported by the recording and distinguishes them from assumptions arising from insufficient quality or context.
Cost and terms
from RUB 90 000. The exact cost depends on the recording's duration, material quality, number of segments and questions, the need for a report review and urgency.
On-screen time, file duration and event sequence
A video recording may contain several time references: the camera timestamp within the image, the position in the player, technical timestamps within the file and the known time of the event. These values should not automatically be treated as a single timeline. The examination must explain which reference was used for a particular answer and what information confirms its connection to the event.
For multiple cameras, it is useful to preserve shared observable events that allow the sequences to be compared. It must be taken into account that the recordings may have started at different times, contain gaps or have been exported as separate segments. Matching clock displays do not in themselves confirm precise synchronisation of the systems.
- The source recording, export method and player used are specified separately.
- The interval before and after the disputed action is preserved so that its context can be seen.
- Known changes to time settings and available information about the device's clock are noted.
- If the duration of an event is being checked, its beginning, end and the method of determining the time interval are described.
Frames selected for an appendix must be linked to the source file and their position in the sequence. An isolated screenshot is convenient for explaining an observed detail, but does not show the continuity of the preceding and following interval. If the data are insufficient, the result states which limitations prevent the time or duration from being determined to the required accuracy.
