我找不到上一个问题的解决方案，所以我决定一步一步地尝试。
我现在想做的事情是将RTP/H264流存储为一个文件。
到目前为止，我发现了以下内容：
（首先，我的RTP/H264是FU-A，它是的形式）
| RTP HEADER 12bytes long | FU INDICATOR 1byte | FU HEADER 1byte | FU payload |
正如我所理解的RFC 6184文档，我用在FU标头的第一位具有"1"的数据包启动NAL，并附加在第一位设置"0"的后续数据包，直到最后一个在FU标题的第二位具有"0"。
我认为这就是如何在FU-a分组之前获得一个完整的NAL，我还发现我需要将"起始位"（0x00000001）放在每个完整NAL的前面。
但到目前为止运气不佳。以下是日志的一部分
========= the new NAL is as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]7C/1111100 [5]85/10000101 [6]B8/10111000 [7]40/1000000 ...
========= adding the next NAL as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]7C/1111100 [5]85/10000101 [6]B8/10111000 [7]40/1000000 ...
========= adding the next NAL as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]7C/1111100 [5]85/10000101 [6]B8/10111000 [7]40/1000000 ...
========= adding the next NAL as 716
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]7C/1111100 [5]85/10000101 [6]B8/10111000 [7]40/1000000 ...
========= a NAL is summed up as 4866
========= the new NAL is as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E2/11100010 [7]20/100000 ...
========= adding the next NAL as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E2/11100010 [7]20/100000 ...
========= adding the next NAL as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E2/11100010 [7]20/100000 ...
========= adding the next NAL as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E2/11100010 [7]20/100000 ...
========= adding the next NAL as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E2/11100010 [7]20/100000 ...
========= adding the next NAL as 139
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E2/11100010 [7]20/100000 ...
========= a NAL is summed up as 7061
========= the new NAL is as 1377
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]41/1000001 [5]E4/11100100 [6]40/1000000 [7]1A/11010 ...
========= a NAL is summed up as 1369
========= the new NAL is as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E6/11100110 [7]60/1100000 ...
========= adding the next NAL as 94
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]E6/11100110 [7]60/1100000 ...
========= a NAL is summed up as 1472
========= the new NAL is as 447
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]41/1000001 [5]E8/11101000 [6]80/10000000 [7]16/10110 ...
========= a NAL is summed up as 439
========= the new NAL is as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]EA/11101010 [7]A0/10100000 ...
========= adding the next NAL as 1174
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]EA/11101010 [7]A0/10100000 ...
========= a NAL is summed up as 2552
========= the new NAL is as 1400
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]EC/11101100 [7]C0/11000000 ...
========= adding the next NAL as 1364
[0]0/0 [1]0/0 [2]0/0 [3]1/1 [4]5C/1011100 [5]81/10000001 [6]EC/11101100 [7]C0/11000000 ...
========= a NAL is summed up as 2742
========= the new NAL is as 1400
...
我的问题是，
如果我可以通过FU-A从碎片数据包中获得完整的NAL，我如何将其作为一个可以由VLC或其他播放器运行的文件？
我仍然很困惑是否必须保留FU指示器和FU标题。有人说我只需要把它们带到第一个数据包（从FU头的"1"开始）
任何建议都将不胜感激。
谢谢。
FU、STAP和MTAP NAL单元仅专用于RTP分组，因为它们旨在促进网络传输。换句话说，不要指望解码器正确地解析它们。最终，您需要像FU数据包那样重新组装NAL单元，或者像STAP/MTAP那样将它们分解为多个NAL单元。
一旦你有了NAL单元（包括PPS、SPS、SEI、切片分区和1-23范围内的所有其他类型），那么你就可以根据H.264附件B将"0001"起始码写入磁盘。
可以使用各种命令行工具将H.264附件B流放入MPEG-4之类的容器中（我非常确信ffmpeg可以做到）。
- 一种选择是将数据多路复用为mp4或avi等文件格式，以便能够使用VLC播放。AFAIR avi不太适合H.264（记不清原因了）。有免费的库，比如libmp4，或者如果你在使用DirectShow的窗口上，Geraint的mp4mux
另一种选择是使用ffmpeg将.264文件转换为mp4
ffmpeg -i test.264 test.mp4
这假设.264文件包含由起始代码分隔的NAL单元。
- 来自RFC6184
FU有效载荷由碎片的有效载荷的碎片组成NAL单元，使得如果分段单元的有效载荷连续FU按顺序串联，即分段NAL的有效载荷可以重建单元。分段的NAL单元类型八位字节NAL单元不包括在分段单元有效载荷中，而是NAL单元类型八位字节的信息分段NAL单元在FU的F和NRI字段中传输分段单元的指示符八位字节，并且在的类型字段中FU报头。FU有效载荷可以具有任意数量的八位字节，并且可以是空的。
如果您采用1中概述的第二种方法，那么在将原始NAL单元写入.264文件之前，您将需要重建它。