Find out if a video stream is an attached pic

[Aztorius]

Hello,

I have MP3 files containing covers. Here is the stream shown by ffprobe :

Stream #0:1: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 3000x3000, 90k tbr, 90k tbn (attached pic)
    Metadata:
      comment         : Cover (front)

Is there a way to know from pyav that this is an attached pic and not an actual video stream without using metadata comment ?

Thank you