After reading a frame like this:
AVFormatContext *ifmt_ctx = NULL;
AVPacket pkt = { .data = NULL, .size = 0 };
...
if ((ret = av_read_frame(ifmt_ctx, &pkt)) < 0)
break;
How to identify this video frame is IDR frame or not ?
as far as I know,
(pkt.flags & AV_PKT_FLAG_KEY) only show it is a keyframe,
but can not identify is a IDR frame.
PS: video codec is 264 or 265
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