I'm just preparing hacktv to run on the i7 laptop to see if it benefits from the speed increase ove the old Athlon64 Linux desktop PC.
Meanwhile here is the output from ./hacktv -h which gives some details not shown in the github info page;
Usage: hacktv [options] input [input...]
-o, --output Set the output device or file, Default: hackrf
-m, --mode Set the television mode. Default: i
-s, --samplerate Set the sample rate in Hz. Default: 16MHz
-G, --gamma Override the mode's gamma correction value.
-r, --repeat Repeat the inputs forever.
-v, --verbose Enable verbose output.
--teletext Enable teletext output. (625 line modes only)
--wss Enable WSS output. (625 line modes only)
--videocrypt Enable Videocrypt I scrambling. (PAL only)
--syster Enable Nagravision Syster scambling. (PAL only)
--filter Enable experimental VSB modulation filter.
Input options
test:colourbars Generate and transmit a test pattern.
ffmpeg: Decode and transmit a video file with ffmpeg.
If no valid input prefix is provided, ffmpeg: is assumed.
HackRF output options
-o, --output hackrf[:] Open a HackRF for output.
-f, --frequency Set the RF frequency in Hz, 0MHz to 7250MHz.
-a, --amp Enable the TX RF amplifier.
-g, --gain Set the TX VGA (IF) gain, 0-47dB. Default: 0dB
Only modes with a complex output are supported by the HackRF.
File output options
-o, --output file: Open a file for output. Use - for stdout.
-t, --type Set the file data type.
Supported file types:
uint8
int8
int16
int32
float
The default output is int16. The TV mode will determine if the output
is real or complex.
If no valid output prefix is provided, file: is assumed.
Supported television modes:
i = PAL colour, 25 fps, 625 lines, AM (complex), 6.0 MHz FM audio
b, g = PAL colour, 25 fps, 625 lines, AM (complex), 5.5 MHz FM audio
pal = PAL colour, 25 fps, 625 lines, unmodulated (real)
m = NTSC colour, 30/1.001 fps, 525 lines, AM (complex)
ntsc = NTSC colour, 30/1.001 fps, 525 lines, unmodulated (real)
a = No colour, 25 fps, 405 lines, AM (complex)
405 = No colour, 25 fps, 405 lines, unmodulated (real)
240-am = No colour, 25 fps, 240 lines, AM (complex)
240 = No colour, 25 fps, 240 lines, unmodulated (real)
NOTE: The number of samples per line is rounded to the nearest integer,
which may result in a slight frame rate error.
For modes which include audio you also need to ensure the sample rate
is adequate to contain both the video signal and audio subcarriers.
16MHz works well with PAL modes, and 13.5MHz for NTSC modes.
Teletext
Teletext is a digital information service transmitted within the VBI lines of
the video signal. Developed in the UK in the 1970s, it was used throughout
much of Europe until the end of analogue TV in the 2010s.
hacktv supports TTI files. The path can be either a single file or a
directory. All files in the directory will be loaded.
Raw packet sources are also supported with the raw: path name.
The input is expected to be 42 byte teletext packets.
Lines 7-22 and 320-335 are used, 16 lines per field.
Teletext support in hacktv is only compatible with 625 line PAL modes.
NTSC and SECAM variations exist and may be supported in the future.
WSS (Widescreen Signaling)
WSS provides a method to signal to a TV the intended aspect ratio of
the video. The following modes are supported:
4:3 = Video is 4:3.
16:9 = Video is 16:9 (Anamorphic).
14:9-letterbox = Crop a 4:3 video to 14:9.
16:9-letterbox = Crop a 4:3 video to 16:9.
auto = Automatically switch between 4:3 and 16:9.
Currently only supported in 625 line modes. A 525 line variant exists and
may be supported in future.
Videocrypt I
A video scrambling system used by the Sky TV analogue satellite service in
the UK in the 1990s. Each line of the image is cut at a point determined by
a pseudorandom number generator, then the two parts are swapped.
hacktv only supports the free-access mode, the image is scrambled but a
subscription card is not required to decode.
Videocrypt is only compatiable with 625 line PAL modes. This version
works best when used with samples rates at multiples of 14MHz.
Nagravision Syster (Simulation)
Another video scrambling system used in the 1990s in Europe. The video lines
are vertically shuffled within a field.
Syster is only compatible with 625 line PAL modes and does not currently work
with real hardware.
