[x264-devel] Does x264 encoder has 1 frame delay on IFrame generation

[Alexander Sbitnev]

>> I discovered that flag for X264_TYPE_IDR becomes effective not on the 
>> exact frame it requested but on the frame comes after that.
>>
>> Is it correct x264 behavior or something wrong with my code/settings?
>
>Are you sure your x264 settings configuration doesn't have a delay between
input and output?  x264 by default has a considerable delay
>(~40-50 frames), and a very specific set of options is necessary to get
zero-latency output.

No I am not sure plain and encoded frame are the same. I have no tool
currently to see difference before and after X264_ENCODER_ENCODE. But as I
see X264_ENCODER_ENCODE start to producing output with reasonable frame
sizes right from the first frame. As I understand in the case of internal
frame processing delay first frame must be empty or ultra small?  Am I
right?
First processed frame info: x264    frame=   0 QP=35.46 NAL=3 Slice:I Poc:0
I:3600 P:0    SKIP:0    size=20344 bytes