如何使用SilverLight播放H264流？

Question

I have an H264 stream (IIS - smooth streaming) that I would like to play with SilverLight. Apparently SilverLight can do it, but how?

Note:
the VC-1 stream can be played by the SilverLight, but H264 not.

Also, I can provide a stream and any additional information required. H264 encoder is the one in Media Foundation (MFT). Same goes for the VC-1 that works (although is it impossible to create equal chunks for smooth streaming because forcing key-frame insertion makes video jerky.

Answer 1

Just a guess. Based on your question 18009152. I am guessing you are encoding h.264 using the annexb bitstream format. According to comments, you can not tell the encoder to use AVCC format. Therefore, you must perform this conversion manually (Annex B WILL NOT work in an ISO container). You can do this by looking for start codes in your AVC stream. A start code is 3 or 4 bytes (0x000001, 0x00000001). You get the length of the NALU by locating the next start code, or the end of the stream. Strip the start code (throw it away) and in its place write the size of the NALU in a 32bit integer big endian. Then write this data to the container. Just to be clear, this is performed on the video frames that come out of the encoder. The extra data is a separate step that appears you have mostly figure out (except for the NALUSizeLength). Because we uses a 4 byte integer to write the NALU sizes, you MUST set NALUSizeLength to 4.

Answer 2

Silverlight 3 can play H264 files. Use MediaStreamSource for this.

Here is the interface description: http://msdn.microsoft.com/en-us/library/system.windows.media.mediastreamsource(v=vs.95).aspx

Also, this blog entry is related to H264 playing sing Silverlight 3: http://nonsenseinbasic.blogspot.ru/2011/05/silverlights-mediastreamsource-some.html It will help you with other issues that may arise.