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Re: [Discuss-gnuradio] bit stuffing DVB-S TX example ?

From: Raydel CM2ESP
Subject: Re: [Discuss-gnuradio] bit stuffing DVB-S TX example ?
Date: Thu, 7 Feb 2019 23:38:35 +0000
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3


I had the same issue, ffmpeg will not provide CBR for MP4 , you might end-up with variable bit rates on the TS stream. I had some good success with a target bit rate on ffmpeg around 150% of the bit rate set on GNURadio. But this will only work with real time inputs like webcam, when trying to run with pre-recorded videos or files I had a huge headache to get a "real" speed on the Rx side.

My set-up was similar to yours ffmpeg+gnuradio+hackrf one and rtlsdr+sdrangel on rx

Using a webcam as input it worked fine for me with around 125 to 150% bit rate on ffmpeg over the one at the gnuradio/sdrangel value.

Let me know if you want to know more about my settings.


Raydel, CM2ESP

On 07/02/2019 23:15, Alban Meffre wrote:
Hi All
did some transmission test in DVB-S tonight
TX : ffmpeg + gnuradio + pluto SDR
RX : RTLSDR + sdrangel
it works but there are some gaps in the received signal because the TS stream bitrate is slightly less to the maximum usable bitrate

is it possible to add some bit stuffing at DVB-S modulator side to make to output power constant ?



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