First, you have to match the TS rate to the symbol rate. The equation is:
Symbol rate * 2 * 188/204 * code rate
For the example flow graph:
8000000 * 2 * 188/204 * 7/8 = 12.901961 Mbps
Second, you need to constrain the video bitrate to fit into the selected
TS bitrate. With ffmpeg, something like this:
ffmpeg -i test.mp4 -c:v libx264 -b:v 10M -minrate 11M -maxrate 11M
-bufsize 8M -c:a copy -muxrate 12901961 test.ts
For SD video, a smaller bufsize like 2M should be used.
Ron
On 2/7/19 15:15, 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 ?
Bob
--
Alban MEFFRE F4GSW
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