I read what an Elementary Stream is on Wikipedia. A tool i am using "Live555" is demanding "H.264 Video Elementary Stream File". So when exporting a Video from a Video Application, do i have to choose specific preferences to generate a "Elementery Stream" ?
What does Elementary Stream mean in Terms of H264
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If you're using ffmpeg you could use something similar to the following:
You'll have to adapt the command line for the file type you're exporting the video from. This generates a file containing H.264 access units where each access unit consists of one or more NAL units with each NAL unit prefixed with a start code (0001 or 001). You can open the file using a hex editor to take a look at it.
You can also create an H.264 elementary stream file (.264) by using the the H.264 reference encoder from raw YUV input files.
If you copy the generated .264 file into the live555 testOnDemandRTSPServer directory, you can test streaming the file over RTSP/RTP.
Generally anything in a container (avi or mp4) is not an elementary stream. The typical extension used for elementary streams is ".264". The quickest way to double check that a file is an elementary stream is to open the file in a hex editor and look for a start code at the beginning of the file (00000001). Note that there should be 3 (000001) and 4 (00000001) byte start codes through out the file (before every NAL unit)
This is purely if live555 has not implemented the required demux (e.g. avi or mp4). AFAIK live555 does support demuxing H.264 from the matroska container.