[Red5] mp4 in flv container

[Gavriloaie Eugen-Andrei]

Hi,

You are the best! I don't know how you managed to decrypt that rtmp  
handshake spaghetti... I'm very impressed! I took the liberty to  
"borrow" the algorithm and put it in practice in my C++ implementation  
and it really works. Now I can stream mp4 in flv container. I Also did  
some investigations by myself and I like to share them with you. Here  
is what I've done:

I've analyzed (with wireshark) the traffic between FMS 3.5 (win32) and  
Adobe Flash Player (OSX Leopard) while streaming a flv containing mp4.  
Here is what is happens:

WS start	WS end	Type	flv start	flv end	payload size
0107e	010b5	V	110	0014B	0002C
010b6	010c5	A	0014b	0015d	4
010c6	084dd	V	0015e	7571	07405
084de	0851e	A	07572	075b5	00035
0851f	1df56	?	075b6	1cfcc	15A17
1df57	3268b	?	1cfcd	316e5	14719

WS start - wirshark dump start offset
WS start - wirshark dump end offset
Type - Audio(0x08), Video (0x09) or 0x16 (what is this!?!?!?)
flv start - flv start offset
flv end - flv end offset
payload size - the size of the rtmp message payload

Observations:

1. for A/V packets WS end-WS start > payload size. and flv end - flv  
start > payload size. This is obvious because there is either flv or  
rtmp format overhead
2. after those 4 A/V messages FMS does an interesting thing: it just  
start to send HUGE chunks of data from flv WITHOUT and computation  
whatsoever until the end of the stream. (no more timing issues :). As  
you can see 15A17+ 075b6= 1cfcc. It just groups n tags from the flv  
and send them over the network via RTMP protocol with message type 0x16
3. When the 0x16 message is sent, the data picked up from flv remains  
untouched (with the flv file format).
4. On the last flv tag of each bunch of tags send, the trailing length  
is set to zero. By trailing length I understand this:

flv tag format
type, length, timestamp, reserved, payload, TRAILING LENGTH

Right now I stream the flv frame by frame which is not pretty and I  
have timing issues. On monday I'll blindly apply the FMS strategy of  
sending big chunks of data.

Contact me if you need further clarifications. I've sent this mail in  
a hurry

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