2019-11 post-Belfast mailing available https://t.co/IOC7ls1uEu #cpp

SO post of the day: "Certainly naive, but I do not understand why this compiles?" #cpp #most_vexing_parse https://t.co/P0bPImqkJi

Wt & JWt 3.5.0 and Wt 4.2.0 released https://t.co/iY1Vdi2Qy1 #cpp #cplusplus

Took a day of coding, half a day of fighting with opencv and half a day of fine tuning, but the first beta version of the video tool thought about building, is ready...

Was a lot of fun, writing the tasks doing the reading, processing and writing of the video gave me some insights. Will blog on some of the details and code later.

Once the Application was build, I did find out that reading and writing videos with OpenCV is not as easy as the API makes you think. But cv::getBuildInformation() lets you print what opencv actually build with and this does not have to match your config.

CMake WITH_FFMPEG does only work if the libraries are installed in the -dev version. Otherwise OpenCV is build without, and you'll not be able to read/write video formats like mp4. GStreamer plugin is another route to go, but I did not try this yet.

Then, when reading or writing video, pin it to the OpenCV ffmpeg API: cv::VideoCapture cap(path, cv::CAP_FFMPEG); Especially writing only worked when pinned to the API.

Reading, Writing and the processing is done as tasks in a QThreadPool. But to not stall the system with lots of processing tasks, the reading thread has to sleep for a few 100 ms to not stall the system and choke everything in video frame memory. Video frames…

I could reuse my dlib based code for face detection and its pool template could be adapted to also work with the QObject based processing task: https://t.co/XYJJzJFgYA

Setup and teardown routines in non-flat class hierarchies https://t.co/xlyyfeD7KU #cpp #cplusplus

One thing I'm wondering about, is it better to keep a large allocation, and not allocate memory for the subframe, or is it better to free the large allocation and copy the subframe into a new allocation.

📢 The CFP session for QtDay 2020 is open! Submit your proposal for a talk or a workshop to be held at QtDay 2020, the unique Italian conference about Qt! https://t.co/Z8plvLq8Xk

Some context from an earlier thread https://t.co/CX3rj6B8FB

Informal poll, because I'm curious: To those of you who are not using exceptions in C++, what is the main reason? RTs appreciated.

StockholmCpp in 2019 https://t.co/9t6kZuxKR1 #cpp #cplusplus

2019-11 post-Belfast mailing available https://t.co/vM73M1deRG #cpp #cplusplus

🔔 Reminder to the Qt community in the #Netherlands; A complimentary #MeetQt event is taking place in #Amsterdam next week. More about the agenda and how to register can be found here: https://t.co/eezPc30hOx #DutchDevelopers #QtDev #LearnQt #QML #UIDesign…

Overload - Frances Buontempo - Meeting C++ 2019 Secret Lightning Talks ACCU Overload magazine https://accu.org/index.php/journals/c78/

A plug for the @AccuOrg Overload by @fbuontempo - Meeting C++ 2019 Secret Lightning Talks https://t.co/A9eRSNMlFX #cpp #cplusplus

A new Pluralsight course is live: C++ 17: Beyond the Basics--Kate Gregory https://t.co/X6A2gK3lTM #cpp