Decoding AV_PIX_FMT_YUVJ420P produces incorrect colors in image

[prophetzopu]

Hello,

I am using jetson-ffmpeg with ffmpeg 4.2.1 on a Jetson AGX Xavier running JetPack 4.3. My inputs are RTSP and RTMP streams in AV_PIX_FMT_YUVJ420P format. The decoder claims to be decoding to AV_PIX_FMT_YUV420P format with color_range AVCOL_RANGE_JPEG (full range 0-255).

It looks like high and low ranges are being clipped. Here are histogram dumps of what I am seeing:

Raw image histogram

Software decode histogram (histogram obtained after dumping image to JPEG)

Hardware decode histogram (histogram obtained after dumping image to JPEG)

Thoughts/suggestions?

This project has been great so far. Thank you for your time!

[mhm0902]

How to support yuvj420 decoding？thank you！

[grantthomas]

How to support yuvj420 decoding？thank you！

https://github.com/jocover/jetson-ffmpeg/issues/83 https://github.com/jocover/jetson-ffmpeg/issues/80

When I apply the advice in issue 83, I can use yuvj420p, but transcoding to mp4 containers hangs ffmpeg. When I apply the advice in issue 80, I can transcode to mp4 ffmpeg, but yuvj420p doen't work.

I'm sure there's a combo of commits that makes it all work.