![]() When comparing Shotdetect graphs with those in QCTools, the zoom feature plays an important role:īy default the graph resolution is hardcoded in Shotdetect: Each horizontal pixel represents one video frame. These are early steps using Gnuplot, and there are still improvements in term of scaling and color, etc. My new company’s Research and Development department has started experimenting with generating PNG images from QCTools’ CSV file, using Gnuplot.īelow you can see “YDiff” graphs of Gnuplot in comparison to QCTools. This way they can be reviewed at any later point in time, without requiring any additional program to visualize the data. ![]() Having the graphs as standalone images not only allows embedding the graphs in the web-browser GUI as a workflow step, but also to store them as metadata in the AIP (archival information package). Generate analysis graphs as images (PNG).Already generate analysis data during digitization workflow, so it can be opened in QCTools instantaneously – drawing the graphs without the operator having to wait.Since DVA-Profession’s control interface is browser-based, the intention is to incorporate the analysis graphs into the browser. Shotdetect is no longer actively maintained by its developer.Since FFprobe is part of DVA-Profession anyway, this reduces the number of application-dependencies. Has a playback window that allows easy investigation of detected artifacts.There are several reasons why we would like to replace Shotdetect with QCTools in the future: For example, features like jumping to a certain frame were added. Our experiences using Shotdetect gave us valuable insight which was provided back to QCTools developers in form of tickets on the GitHub site. Unless of course, they just drive on anyway hoping it will be okay. If users are committed to performing quality digitization work, just like with an unreliable traffic light, they will need to stop and look both ways. ![]() If the user is aware of this issue, they will spend the same amount of time checking the material for undetected errors as they would if there was no automatic detection at all.Īutomatic detection would be a great thing, but for the time being, it might give users a false feeling of safety and control. When a user relies solely on the automatic detection, some errors will go through unnoticed. This leads to an interesting situation: Think of crossing a busy intersection with an unreliable traffic light. Many artifacts go through undetected because existing algorithms are not powerful enough they also produce false-positives. These systems are currently still far from perfect. We have done direct comparisons with state-of-the-art tools that offer automatic audiovisual artifact detection. When showing others how easily certain transfer errors or video artifacts might be spotted using these 2 simple graphs, the first question was: “What about automatic detection?” RGB colors: The sum of color values in a frame.Quantity of movement: The difference between 2 frames.This demands the operator to engage himself/herself in detail with the analysis graph, to study its “language” and to develop a feeling for those graphs. The “analysis graph” offers the operator an opportunity to detect problems of the captured video tape with incredibly high accuracy: all kinds of video artifacts can be detected, ranging from small things like dropouts to the complete break off of a video signal. The description below is from the DVA-Profession manual: Shotdetect was not developed for quality control, but for identifying shots and scenes in a video. Within the system there is a post-capture error analysis task that uses graphs generated by a program called Shotdetect. – Kelly HaydonĪustrian Mediathek uses a digitization workflow system called DVA-Profession. Peter is a notable contributor and user of QCTools and recently I asked him if he could describe for us how QCTools is used in conjunction with Mediathek’s innovative digitization workflow system, DVA-Profession, for which he also serves as a lead developer. Peter Bubestinger is a digital archivist who has worked with many cultural heritage institutions including Austrian Mediathek (Österreichische Mediathek), the country’s national audio/video archive. As our open-source, video analyzation software, QCTools continues to evolve, we’ve been talking to users around the world about how they use the versatile application in their specialized workflows.
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