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copied!<p>From the discussion in the comments I rephrase your question and split it into two:</p> <h2>I want to extract NAL units from H264 RTP packets in pure java and dump them into an Annex B H264 file.</h2> <p>How do I do that? Is there a library?</p> <p>The payload of these packets is specified in <a href="http://www.ietf.org/rfc/rfc3984.txt" rel="nofollow">RFC3984</a>. </p> <p>I don't know any Java library that performs this out of the box. But implementation is fairly simple as long as the packaging type is not interleaved:</p> <p>RFC3984 allows three packaging type </p> <ul> <li>Single NAL unit mode</li> <li>Non-interleaved mode</li> <li>Interleaved mode</li> </ul> <p>as long as your packet source is sending in single NAL unit mode or non-interleaved mode you can extract the NAL units without any further processing from the packets and dump them to disk with 0x00,0x00,0x00,0x01 as divider between them. </p> <p>If the packaging type is interleaved you need to put a lot more work into that since than you will have to look into the NALs and re-order them to be in decoding order.</p> <h2>I mux raw Annex B H264 files into an MP4 container in pure Java</h2> <p>You can you use my <a href="https://github.com/sannies/mp4parser" rel="nofollow">mp4parser</a> project to generate a MP4 from the Annex B format. Have a look at the <a href="https://github.com/sannies/mp4parser/blob/master/examples/src/main/java/com/googlecode/mp4parser/muxformats/H264Example.java" rel="nofollow">H264Example</a> - that should give you an idea on how to use it. </p>

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