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Re: [Discuss-gnuradio] DVBT project receiver problem [demultiplex the tr

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] DVBT project receiver problem [demultiplex the transport stream]
Date: Mon, 7 Dec 2015 13:07:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

Hi Ihab,

the point is that the multiplex you're probably considering now is the MPEG transport stream multiplex. Please correct me if I'm wrong!

De-multiplexing MPEG is really something that should be handled by an existing MPEG decoder; so yes, VLC, mplayer, ffmpeg itself would be the right tools.

What I'd recommend is just using
1. "mkfifo input_fifo output_fifo0 output_fifo1 output_fifo2 …" to generate to Unix FIFOs to get data out and back into GNU Radio,
2. Using normal file_sink and _source with aforementioned FIFOs
3. calling "ffmpeg -i input_fifo -c copy -map 0:0 output_fifo0  -map 0:1 output_fifo1 …" to copy the first stream to fifo0, the second to fifo1 etc.

Note that I haven't tested this myself.

Best regards,

On 07.12.2015 12:50, Ihab Zine wrote:
Hi all again,

currently I'm able to receive a dvbt signal and display it.  the problem I'm facing now is the multiplexing, I'm receiving multiple broadcast channels on a single frequency (570Mhz) at once, I want to select a single broadcast channel, so I'm looking for a way to demultiplex the transport stream using Gnu radio (not using VLC) so i can have a access to the data of one stream at a time. if there is any project dealing with this problem or if there are any hints that would help me to start solving this problem please do.



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