[FFmpeg-user] Non-keyframes included in cut video displaying unpredictably?

[Ted Park]

> You didn't tell us which framework shows more frames.
> 
Ah, sorry, I meant ffplay, VLC, etc. shows the extra frame at the beginning on playback. AVFoundation (Quicktime, Safari, etc.) Doesn’t 

> I don't know about "just" but it sounds like a difference in implementation.
> 
>> If so, are they both correct?
> 
> That is unlikely unless the played file is invalid.
> 

Do you mean that one of the behaviors is incorrect, assuming the file is proper? I am not sure I understand.