[scott967]

I didn't check in detail to make sure, but in just observing some video files that have VP9 video stream the codec flag is Webm.  Webm is an Mkv container variant, not a codec AFAIK.  The files in question happen to be mp4 files.

Example file ffprobe output:

Code:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    title           : δäî δé┤Ω║╝
    artist          : ∞áò∞åî∞áò
    album_artist    : ∞áò∞åî∞áò; Jung So Jeong
    album           : δäî δé┤Ω║╝
    date            : 2020- 2-13
    encoder         : Lavf58.29.100
    genre           : k-trot
    track           : 1
  Duration: 00:03:15.33, start: 0.000000, bitrate: 688 kb/s
    Stream #0:0(eng): Video: vp9 (Profile 0) (vp09 / 0x39307076), yuv420p(tv), 1080x1080, 555 kb/s, SAR 1:1 DAR 1:1, 25.01 fps, 25 tbr, 16k tbn, 16k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(kor): Audio: opus (Opus / 0x7375704F), 48000 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

scott s.
.