ensure V is for video

[chemag]

A 2-frame, ffmpeg-generated video:

$ m2pb dump --pid --pts --type frame-02.ts    
17 - - 
0 - - 
4096 - - 
481 126000 - 
481 - - 
481 - - 
481 - - 
481 - - 
481 - - 
481 - - 
481 129003 - 
482 125520 1 
482 - - 
482 - - 
482 - - 
482 - - 
482 - - 
482 - - 
482 - - 
482 - - 

The type for the video streams should be "V" if unknown. There is an issue with the h.264 video code.

$ ffprobe -i /media/fb1/var/media/ads/blackframe-02_blackframe-02.ts
...
    Metadata:
      service_name    : Service01
      service_provider: Libav
    Stream #0:0[0x1e1]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x1e2]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 192 kb/s