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The ffprobe show frames output shows the following details:

[FRAME]
media_type=video
key_frame=1
pkt_pts=42
pkt_pts_time=0:00:00.042000
pkt_dts=42
pkt_dts_time=0:00:00.042000
pkt_duration=N/A
pkt_duration_time=N/A
pkt_pos=799
width=1920
height=1080
pix_fmt=yuv420p
sample_aspect_ratio=1:1
pict_type=I
coded_picture_number=0
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
reference=3
[/FRAME]

I was reading this article and was wondering how to differentiate between the two types of frames from the above output.

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1 Answer 1

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8

Frames with key_frame 1 (will have picture type I) are IDR frames.

I frames with key_frame 0 are not.

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  • It doesn't seem to work exactly like that -- non-IDR frames with the Recovery Point SEI set are also reported as keyframes
    – Claude
    Mar 4 at 19:09
  • Those types aren't common unless you work with transport feeds.
    – Gyan
    Mar 5 at 4:07
  • I'm working a lot with .MTS files from JVC camcorders; they're full of them. But indeed I have no knowledge on how much they appear "in the wild"
    – Claude
    Mar 5 at 10:06

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