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
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