Hi,

I try to make use of this library to convert MJPG encoded frames to a format (RGB, RGBA or YUV) that can suite my needs for image processing . This is because on my Windows computer (and maybe others) the only webcam encoding that can provide (somewhat) high resolution with decent framerate is the MJPG one.

Anyway, I am using a modified version of Escapi which is a Rust library around some Windows API for Webcam capture (among other things). I managed to get the MJPG encoded frames buffer but while trying to decode them I got the following error:

Error is invalid JPEG format: scan makes use of unset dc huffman table

After dumping a frame into a file on looking at it in an hex editor I can confirm that the file has no huffman table section. The Windows image viewer cannot open the file but GIMP manage to do it. Plus, inserting some huffman tables before the "start of scan" section from another random jpeg (found on the web) allow me to see it in the Windows image viewer and to decode it using this library. So I am no expert in JPG nor data compression/decompression but it seems that while my buffers are not strictly valid jpeg files because they lack huffman tables, there is a way to decode nonetheless them. Do you think you will be able to add support for this case?

By the way, I can provide some files if you want to take a look at the MJPG buffers.