[Live-devel] about mpeg4 stream project

[Lin.Dong at quixotecorp.com]

Hi Ross and all,

Thank you for your advice.

I did some simulation tests today as you advised (
your-reader-application | testOnDemandRTSPServer), 
but somehow I did get stream video success, the VLC player could not get
any data from my application.

the first thing I did was I changed testOnDemandRTSPServer.cpp as you
advised, when I run the program, I did see "stream from the file "stdin"
"  came out on my screen, I think this program has no problem; The real
problem might come from my "your-reader-application.c". In this program,
I read a mpeg4 data file to my internal buffer and then I write these
data to "stdout".

I used  
strIn = fopen("test.m4e", "rb") to open a stream io;
and fread(buf, sizeof(unsigned char), 1024*1024, strIn) to get data in
my buffer;

I check the data in the buffer, they are OK. 

I used a couple of "c" functions to send data out, such as
fprinf(stdout, "%x", data) and fwrite( &data, sizeof(unsigned char),
data_size)...... 
but none of them make the program working. I think the data type may be
wrong from my first program to sendcond program.

I guess the type of data sending to "stdout" is binary, and next
program's "stdin" will read binary data too. some how I do not know how
to make the "stdout" as a binary stream io. In window program, I can use
_setmode() to change stream io property. 

Please help.

Thank you in advance.     

Lin Dong 
Quixote Corp.


Ross Finlayson finlayson at live555.com
<mailto:live-devel%40lists.live555.com?Subject=%5BLive-devel%5D%20about%
20mpeg4%20stream%20project&In-Reply-To=41E16D542244C24F97752590527EF9BB0
1FD9A92%40flsv1065.pal.quixote.prv> 
Thu Jan 10 13:39:40 PST 2008 
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>I am doing a mpeg4 stream project on embedded Linux system, the 
>MPEG4 data come from a circular buffer or ping-pong buffer in my 
>embedded device, It seems I can start from 
>testOnDemandRTSCServer.cpp, but my problem is how I can make the 
>memory buffer as a file in Linux system

The easiest way to do this, IMHO, is to write an application that 
reads encoded data from your buffer, and writes it to 'stdout'.  Then 
pipe this into the "testOnDemandRTSPServer" application, by running:
	your-reader-application | testOnDemandRTSPServer

For this to work, you will need to modify the 
"testOnDemandRTSPServer.cpp" code to
1/ set "reuseFirstSource" to True
2/ use the filename "stdin" instead of "test.m4e"
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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