[FFmpeg-user] Find all IDR frames of a video with respective timestamps

[Mark Filipak]

On 28/06/2024 14.42, Richard Bartczak via ffmpeg-user wrote:
> Hello,
> 
> nothing I have found. Neither via ffprobe, nor via ffmpeg, I have found
> a solution.

A solution to what, Gloster? What are you trying to solve?

I'll give my latest take on IDR frames: They don't exist, per se. What I think an IDR frame is, is 
an ordinary I-frame, open or closed GOP, that follows a closed GOP.

  closed GOP _____ _________ An IDR frame
DTS order ..B B P I P B B P..
             ^^^^^
    open GOP _____ _________ Not an IDR frame
DTS order   ..B B I P B B P..
               ^^^
               The difference is here

Now, in MPEG-2 TSes, there may be an MPEG tag that forces the previous GOP to _become_ a closed GOP, 
but I doubt it because that would require all decoders to buffer all B-frames up to the next P- or 
I-frame and to then throw them away if the next I-frame said "IDR"! That defeats the purpose of open 
GOP, and, besides that, what's on the screen in the meantime? Nothing? A picture repeat? No, no, no.

Yesterday I read that mastering authors are recommending that open GOP be avoided so that all 
I-frames are automatically IDR frames.

It looks to me that MPEG has produced another dog's breakfast.