Why Avcodeccontext Extradata Is Null?

I am trying to decode h264 video using ffmpeg and stagefright library. I'm using this example. The example shows how to decode mp4 files, but i want to decode only h264 video. He

Solution 1:

If your input is a raw h.264 file, It is already in annex B format. So you do not need to do the "h264_mp4toannexb" conversion. In addition, in annex B, the SPS/PPS are sent inline with the first (or every) IDR frame. So no extra data is needed. Read more here: Possible Locations for Sequence/Picture Parameter Set(s) for H.264 Stream