New Video Evidence Recovery and Analysis Training and Software

We are very pleased to be able to offer investigators and examiners some new software and training.

In addition to the DVR Examiner software we are now able to supply iNPUT-ACE software and the Cellebrite VERA course.

I will be putting up more information on the website soon but here are a few words about the software and training;

iNPUT-ACE and iNPUT-ACE | Lite software packages provide investigators with powerful tools to manage their digital video evidence. The two dynamic software programs work alongside each other to expedite any case that involves video evidence: from video playback, to clip extraction, enhancement, analysis, report writing, and much more.

Video Evidence Recovery and Analysis (VERA) Course (To be held in the UK)

The Video Evidence Recovery and Analysis Course (VERA) is five-day intermediate level course designed to introduce investigators, examiners and analysts to digital video technology and to meet the specific needs of the digital video examiner and analyst.

Students will learn proper methods to interrogate digital video evidence while receiving guided instruction throughout the process of recovering valuable evidence from video images. The course will also focus on specialized investigative techniques for the examination of video to explore issues relating to the use of force, speed estimation and identification. A variety of DVR, body-worn and in-car video sources will be examined in depth, testing data acquisition, file identification, image accuracy, video processing work flows and report writing.

If you would like to know more please get in touch.

The Basics of Reverse Engineering a DVR Filesystem

Reverse engineering the CCTV DVRThe Basics of Reverse Engineering a DVR Filesystem

At the heart of DVR Examiner is its ability to read a proprietary DVR filesystem and display and extract the data contained on the device. The ability to read these filesystems is not something that DVR Examiner does automatically – first someone from our Advanced Technical Services (ATS) team has to reverse engineer each filesystem implemented within the program. Only after completing this lengthy process can DVR Examiner recover the video evidence from surveillance DVRs. This post touches on some of the first steps our team takes to understand how each different filesystem works.

You can read the rest of the article on the developers website here  (opens in a new page)

Demux are the UK resellers of DVR Examiner if you would like a trial of the software or more information please visit this page

Feature Focus: DVR Examiner 2.5 Aspect Ratio

A new feature in DVR Examiner 2.5 helps review material that has been recorded at half the frame height by adjusting the aspect ratio for the preview.DVR Examiner 2.5 Aspectb Ratio

Important to note that this is intended to make reviewing easier and is not intended to confirm what the correct aspect ratio of the clip should be nor does it effect any files that are exported as these will be exported as they were recorded.


You can read the full article here

DVR Examiner Training

DVR Examiner User Certificate TrainingWe are very pleased to announce that there will be two DVR Examiner User Certification classes run in the UK in September 2018. Tutors will be from the software developer DME Forensics.

As a forensic investigator, you often face time-sensitive situations, where the accuracy of your evidence can make or break a case. By using DVR Examiner, you can save both time and money in these situations, but it helps to know how to use the tool effectively.

While DME Forensics put a lot of effort into making DVR Examiner simple and easy to use, it is still a very complex tool with a lot of powerful capabilities. Understanding the basics behind how DVR Examiner works, as well as the best practices and methodologies for the software can be critical in any investigation. With training, you can fully maximise DVR Examiner’s potential to assist in your case.

The User Certification Training guides users through the process of how DVR Examiner works, from DVR acquisition to complete video recovery and data output. We will go over all of the newest features of DVR Examiner, including the recovery of deleted (inaccessible) video. Students will explore how to make the most of DVR Examiner in real world scenarios, and how to defend your evidence in a court.

This training is especially important if you’re likely to testify to the work done with DVR Examiner. Being a certified user can be critical to DVR Examiner in court. Opposing counsel can be very diligent in ensuring the accuracy of evidence being entered, so being able to explain your methods, along with how DVR Examiner operates, can help you defend your evidence.

Location: Between Manchester and Liverpool.


Course A – 8:00 Monday 24th September to 12:00 Wednesday 26th September

Course B – 13:00 Wednesday 26th September to 17:00 Friday 28th September

Certificate: When the student is present for all sessions and has passed all exams, they will receive a certificate of completion. When the attendee has actively taken part and was present for all sessions but failed to reach the required standard in the exams they will receive a certificate of participation.

More Details

For further details please email



Training – VFSource User Training February 2018

Last week we were in Merseyside with Jeff Hunter of Salient Sciences training video examiners from various UK police forces. It was interesting to hear the different ways that video material is being processed and presented for prosecutions.

Providing training to video examiners

Jeff, who is the Principal Engineer at Salient Sciences, was particularly interested to speak with users to gain an insight into their real-world issues when working with multimedia evidence as he can influence the future development of the software to assist users to work more efficiently and effectively.

The course was attended by new and experienced users and the following comment highlights why training is so important…..

“I can say that I really enjoyed the course. It has re-ignited my interest in working with digital media.  I always knew the software could do more than I was using it for.  I can also say that the first job this morning has already seen my new skills in action.” Course attendee DP of Derbyshire Constabulary.

Both the VFSource and VFPro software provide examiners with the tools to work with proprietary and non-proprietary video and audio material.

If you would like more information about the VideoFOCUS software or future training events please complete the form on one of the product pages – VFSource or VFPro

Introducing the DVR Examiner Updater

The DVR Examiner Updater application allows you to continuously update your existing version of DVR Examiner with newly supported filesystems and improvements to existing filesystems as we finalize them. Basically, this new application brings you system compatibility with new DVRs, faster.

DVR Examiner - filesystem updater

There are a few ways to run the DVR Examiner Updater. If you are connected to the internet, you can click the link on the notification screen within DVR Examiner (pictured below). Otherwise, use the Windows start menu or launch the DVRExaminer_Updater.exe from the DVR Examiner installation folder (usually C:/Program Files/DVR Examiner).

DVR Examiner - version window

The process for updating your filesystem database version will depend on whether or not your work station is connected to the internet. If you have an internet connection, you can download and install Filesystem Database Updates (FDUs) from the DVR Examiner Updater. The Updater will allow you to download a new FDU from the portal and then install the new FDU immediately, so that DVR Examiner has the most current filesystem code to run from.

If your work station is not connected to the internet, you will have to use an internet connected computer to download the the latest FDU from the Support Portal and move the FDU to your work station (using a flash drive). After moving the FDU to your work station, you can select the “Add FDU” option in the top bar of the DVR Examiner Updater. You will then be able to install that FDU so DVR Examiner can have access to the latest filesystems and filesystem improvements.

Note: if a FDU does not appear in the grid of the Updater after being added, you can refresh the Updater Grid by clicking the “Check for Latest FDUs” button.

For more information on using the DVR Examiner Updater, check out this short training video (turn on your speakers).

We are excited to bring you this new feature of DVR Examiner to help bring you filesystem updates at a faster pace. If you encounter a filesystem that is not supported by DVR Examiner, be sure to submit a request to the technical support team at Please include the name of the filesystem in your email.

Haven’t updated DVR Examiner to 2.2 yet? Click here to download the latest version and get access to continuous filesystem updates.

If you are involved in the recovery of video from CCTV DVRs and you are not yet a user of DVR Examiner you can obtain a free trial here and discover how much easier it is with a tool specifically built for the task.

Free 30 Day Trial


This post was originally posted on the DME Forensics blog.

Recovering Deleted DVR Video with DVR Examiner

DVR Examiner - recover deleted video from a CCTV DVRMany DVR users believe that by deleting video through the DVR interface, they are rendering video unrecoverable. Fortunately for forensic investigators, this is not the case. In most instances, when video is deleted through the DVR interface, only the index (or accessibility) to that video is being deleted. Assuming the video itself has not been overwritten, DVR Examiner may be able to recover it.

DVR Examiner can recover deleted DVR video by using the “inaccessible recovery” feature in DVR Examiner. What does “inaccessible” mean? In short, it refers to video that the DVR no longer knows how to find. A less precise term for this would be “deleted”, but there are several ways a video can become inaccessible other than deliberate deletion by the user. The most common way would be that the DVR was operating normally and simply needed more space for newer video.

When you initially scan a HDD, one of the first screens that comes up is the Supported System Identified screen. This screen displays all the features that DVR Examiner supports for this particular filesystem. If inaccessible recovery is supported, the “Inaccessible” icon (on the far left) will be highlighted in orange.

DVR Examiner - Inaccessible video recovery

DVR Examiner supports two inaccessible recovery types. The first type, simply called “Inaccessible”, refers to the ability of DVR Examiner to locate large segments of deleted video that the DVR no longer recognizes. For example, when a disk is reformatted or deleted, if no additional video is recorded, all the original video is largely intact but simply missing index entries. The second type, “Frame Level Inaccessible” refers to the ability of DVR Examiner to recover very small segments of video which may have been partially overwritten by newer video. This is a much more complex and complete recovery type – we’re often able to recover some video from weeks or months in the past that was never actually overwritten. Keep in mind that either recovery type will typically result in a slower scan process.

DME Forensics hope to be able to add inaccessible recovery to as many filesystems as possible. If you would like to request inaccessible recovery be added for a specific filesystem, you can do so by sending them an email at Please include the name of the filesystem in your email.

Due to limitations within specific filesystems, inaccessible recovery will not always be able to be implemented within DVR Examiner. However, this typically does not prevent their Advanced Technical Services (ATS) team from being able to recover the data manually. If you have a specific case where inaccessible recovery is crucial, please contact DME Forensics to discuss potential options.

If you are involved in the recovery of video from CCTV DVRs and you are not yet a user of DVR Examiner you can obtain a free trial here and discover how much easier it is with a tool specifically built for the task.

Free 30 Day Trial


This post was originally posted on the DME Forensics blog.


Salient Sciences Video FOCUS release V7.x

VideoFOCUS version 7

With this latest release, Salient Sciences are introducing new features and updates to assist examiners to work efficiently with their AUDIO and VIDEO evidence.

If you have a current support contract please download the latest version from here

If you would like to know more and request a trial version of the software please visit this page.


VideoFOCUS 7.0 can now generate pdf report documents describing video and image items in a project.

A report can be created by selecting the desired media items and choosing the ‘view report’ item in the view menu. Alternatively individual image or video items can be reported on by using the ‘view report’ menu action from the session or still list popup menus. A report can also be created by selecting the option in the export media dialog. In this situation a report will be created that includes sections for each media item that is being exported.

VideoFOCUS will automatically generate a full ‘steps to reproduce’ section for each item in the report and will provide a basic summary of the properties of each item that is being reported. In addition to the automatically generated sections the user can also add item specific notes to each media item using the session or still property dialog and these notes will be included in the report. The VideoFOCUS cases now offer properties than can be set, including agency and examiner names, case number and title and an overall notes section and these properties will also be used in the composition of the report.

Macros (VFPro only)

VideoFOCUS now supports the concept of macros. Macros are a way to apply a set of actions taken on one piece of media to other similar media, without having to repeat the actions in the user interface. Typically this might be used to apply similar processing to related videos that are determined to require the same sequence of modifications,filtering etc in every case.

There is no specific process to define the steps in a macro. All that is required is to select an item that is the product of processing and use the right click menu ‘copy macro starting at’. When this is menu option is selected VideoFOCUS will offer the various points in the processing history of the item as starting point for the macro action. The macro processing include all steps between that point and an the final step producing the selected media item

Once copied the macro can be applied to other items by simply selecting them and using the ‘apply macro’ popup action. When applied the macro application will produce a new item that are the macro steps applied to that item. It is also possible to apply a macro to a set of selected items as a single action. In his case a result will be created for each selected item.

Macro actions are full described in the report in terms of the original actions that compose the steps of the macro and then application of the macro. Macros of macros are also supported.

Under certain circumstances the application of a macro can lead to invalid output. Most commonly this will be when references are made to times or views that do not exist in the target media. VideoFOCUS is designed to detect such situations and will advise the user that the macro cannot be applied.

Unified Export

VideoFOCUS now has a single export dialog that supports the simultaneous export of images, video and audio. The items that are export depends on which export menu is used and what is selected. When the export is invoked from the session list popup the export is restricted to selected items in that list. Similarly when the export is invoked from the stills area popup the export is limited to selected items in that list.

If however the export is invoked from the main file menu the export will included all selected items in both the session and stills areas. When combined with the report option, this allows for a production of a single report including all items that a user may wish to export from VideoFOCUS. When there is a mixed set of media types in the export dialog the video, images and audio tabs provide for control over any configurable aspects of each specific type.

Other Changes

Item Labeling and Tooltips

VideoFOCUS has been updated to provide a more consistent methodology for the labeling of media items created by filters, modification, edits etc. There is now also a tooltip associated with each media item offering a short description of the process step that was used to create the item. The tooltip includes the label name of the item’s source to aid in locating the source item

Project Time Zone

Projects can now use timezone that is distinct from the system or default VideoFOCUS time zone. The time zone choice is available via the File menu item ‘project properties’. The timezone choice controls the presentation of times in both the interface and in and reports associated with items in the project.


If you have a current support contract please download the latest version from here

If you would like to know more and request a trial version of the software please visit this page.

VideoFOCUS Screen Capture

Working with digital CCTV files in a proprietary format isn’t easy and sometimes you need to use screen capture, what Salient Sciences call the “Import method of last resort”, to get the video into VideoFOCUS so that you can then start to process the material.

In this video Don Tunstall, the General Manager at Salient Sciences, talks us through the process and provides some useful tips on good practice.

Screen Capturing into VideoFOCUS from Salient Sciences on Vimeo.

If you would like to know more about how VideoFOCUS software can help you to process both Audio and Video material please contact us using the form here make sure to select the software that you are interested in from the drop down list.

DVR Examiner – Features – Clip Attributes

What units does the Duration Slider use?

I was recently asked by a user of the software what units the Duration Slider in the Clip Attributes panel uses. So to answer their question I thought I would write this blog post. (If you can’t wait for the answer it is…………… minutes, but see below for more info.)

With the introduction of V2.x the developers at DME Forensics have introduced many new features and expanded the capabilities of some of the existing ones too so this post answers the above question but also introduces users to some of the other features of the Clip Filters panel. You can also pre filter the clip results prior to initiating the scan function see the paragraph at the end of this post.

DVR Examiner Clip Attributes Panel

The following (mostly taken from the help file)  applies to V2.0.4.0;

Clip Filters

Once you have scanned the hard drive and been presented with the results in the clip list you can filter the results for faster review.

At the moment the panel is split into three headings, more detail regarding the first two headings is available in the software’s help file;

Date/Time Configuration

Will allow you to adjust for any difference between the actual time and the time set on the DVR.

Date/Time Filtering

You can set the date/time of interest, defaults to first and last found on the DVR hard drive.

Clip Attributes

Size Slider – Filter clips based on size in MB. The left slider can be used to designate a minimum size and the right slider can be used to designate a maximum size.
Duration Slider – Like the Size Slider, the Duration Slider can be used to designate the minimum and maximum clip durations displayed in the clip grid. The original question prompting this blog was “What units does the slider use?”
The answer is minutes BUT be aware that at the moment the indicator  reports only full minutes so as you move the sliders only the minute is reported but the position of the slider actually relates to the fraction of that second.
Using the example depicted in the image above, if you positioned the minimum slider as far to the right so that the indicator displays 2 but just before it changes to 3 and select “Apply” none of the clips would be shown.

So why might you want the ability to filter on size or duration?

In general, I suspect both of these would be used primarily in situations where the DVR is recording motion. In those situations, DVR Examiner will recover a lot of clips of smaller size and/or duration. So, if you are reviewing video looking for an event that would likely take some time to commit, you could start by filtering out all of the really short/small clips and focus on the larger ones. On the reverse side, the DVR may be mostly recording continuously, so you are left with thousands of 200MB clips of 1 hour each. You could set a max size or duration filter less than those to find any motion events that were recording.
The size filter could also apply for some of the DVRs that record a high quality stream and a lower quality stream. The duration and time stamp will likely be the same, but one clip would be smaller than the other. That being said those DVRs typically tag the secondary stream as a different channel which could be filtered as well.

For completeness here are the other options under the Clip Attributes heading (more details in the help file);

Status – The Status dropdown will display all options available for the filesystem scanned.

Channel – The Channel dropdown will display all channels recovered from the DVR, not all channels available on the DVR.

Has Tags (not shown in the image) – Find clips with or without tags.

Has Notes – Find clips with or without notes.

Pre Filter ResultsDVR Examiner - clip filter

There is also an option to filter the clips prior to scanning, this is useful to reduce the amount of clips displayed, if you need to change the filter parameters you can still do that once the clip list has loaded. I think the feature to only list clips within x hours of last recorded Date/Time would be something I would use a lot.
If you have any questions or ideas for new features please let me know by clicking here to send me an email.

If you have a current DVR Examiner subscription please download the latest version from the support portal here

If you are involved in the recovery of video from CCTV DVRs and you are not yet a user of DVR Examiner you can obtain a free trial here and discover how much easier it is with a tool specifically built for the task.

Free 30 Day Trial