Convert from Annex-B to AVCC/AVC1

[thattrain]

After doing some research, I've noticed that the video you are using is in AVCC/AVC1 format (4 byte length in Little Endian of a NALU follows by H264 raw stream), but most of the video I found was in Annex B format (start code instead of 4 byte). I can not find a "easy" method to convert from annex b to avcc/avc1.