Decode 1K/4K MJPEG file

[LinhDNguyen]

Hello,

I have tried to customize your project to decode Full HD JPEG file and 4K JPEG file. But it does not work as expected. This is how I test:

• On your code, main() function, I replace SetVfmState() by ResetVfmState() to show the decoded image to monitor.
• To try with Full HD file, I increase the width and height to 1920 x 1080. But the monitor shown HD cropped image, and bottom + right sides of monitor is noisy.

Could you please guide me what do I need to make FHD file works? Thank you.

[tolszak]

Sorry I never used it to show on screen, only to decode it. If I understand correctly when you changed setvmstate you also change default decoder to ppmgr which replaces ionvideo. Hence most of code of this application will not work. Look at c2play it does something you would like to achieve: https://github.com/OtherCrashOverride/c2play

[LinhDNguyen]

Thank you. It is now Ok after I remove EXIF metadata from JPEG file.

One more question. In checkForFrame(), how can I get data from ION buffer after V4L2 buffer dequeued (VIDIOC_DQBUF)? Thank you.