UsingExpectWithVlc

```plaintext
$ telnet myhost 2048
Trying 192.168.0.50...
Connected to myhost.
Escape character is '^]'.
VLC media player 3.0.18 Vetinari
Password:
Welcome, Master
> volume
26
```
Help is obtained in the obvious way
```plaintext
> help
... see below
```
The [script](/aw/os/shell/ScriptCommand) is useful for getting transcripts from things like telnet sessions.
(This saves from the need for each and every application to implement its own transcription facilities.)

## Helper scripts
### Auto login
`tvlc` logs you in with a know password (low security since this is a home network and it's just [VLC](VlcPlayer)).
I allocate telnet ports in the range 5000--5999 and often have multiple instances, each with its own playlist,
so that instead of clearing/loading new playlists, I simply alt-tab between them.
```expect
#!/usr/bin/expect
set timeout 1

set host "[lindex $argv 0]"
set tport "[lindex $argv 1]"
puts "tport '$tport'"
if { $tport == "" } {
  set tport 0
}
set port "[expr 3000 + $tport]"
set password "boingboing"

spawn gtelnet $host $port
expect {
  timeout { puts "timeout" ; exit 1 }
  "Password:"
}
send "$password\r"

expect {
  timeout { puts "timeout welcome" ; exit 1 }
  "Welcome, Master"
}

interact
```
### Command Sender
I'm not an expert in Python's `subprocess` module, so I don't know how to capture the output.
Anyway, use it like
```bash
tvlcmd hostname 15 next
```
to advance the VLC player to the next item in the playlist. The script:
```python
from subprocess import run, Popen, PIPE

a = r"""set timeout 5

set host "[lindex $argv 0]"
set tport "[lindex $argv 1]"
puts "tport '$tport'"
if { $tport == "" } {
  set tport 0
}
set port "[expr 4000 + $tport]"
set password "random_flumpy_thing"

spawn gtelnet $host $port
expect {
  timeout { puts "timeout pw" ; exit 1 }
  "Password:"
}
send "$password\r"

expect {
  timeout { puts "timeout welcome" ; exit 1 }
  "Welcome, Master"
}

sleep 0.1
"""

import sys
args = sys.argv[1:]
try:
  host, port, *args = args
  if len(args) == 0:
    raise ValueError()
except ValueError:
  print(f"{sys.argv[0]} <host> <rport> [<cmds>...]")
  exit(1)

b="sleep 1"

args = [arg.replace('"','\"').replace(r"[",r"\[").replace(r"]",r"\]") for arg in args]
args = [f"send \"{arg}\\r\"" for arg in args]
scr="\n".join([a]+args+[b])

proc = Popen(["expect","-f","-",host,port],stdin=PIPE,stdout=PIPE)
m = proc.communicate(input=scr.encode())
```

### Cygwin
To add a file via `tvlcmd` on cygwin (say `localhost` and port 7001), use
```
tvlcmd localhost 1 "add file:///$(cygpath -w "$(readlink -f "video.mp4")" | tr '\\\\' '/')"
```

## VLC Telnet help
This is the output of the `help` command with my current version of [VLC](VlcPlayer) (3.0.18).
```plaintext
+----[ VLM commands ]
|help
|    Commands Syntax:
|        new (name) vod|broadcast|schedule [properties]
|        setup (name) (properties)
|        show [(name)|media|schedule]
|        del (name)|all|media|schedule
|        control (name) [instance_name] (command)
|        save (config_file)
|        export
|        load (config_file)
|    Media Proprieties Syntax:
|        input (input_name)
|        inputdel (input_name)|all
|        inputdeln input_number
|        output (output_name)
|        option (option_name)[=value]
|        enabled|disabled
|        loop|unloop (broadcast only)
|        mux (mux_name)
|    Schedule Proprieties Syntax:
|        enabled|disabled
|        append (command_until_rest_of_the_line)
|        date (year)/(month)/(day)-(hour):(minutes):(seconds)|now
|        period (years_aka_12_months)/(months_aka_30_days)/(days)-(hours):(minutes):(seconds)
|        repeat (number_of_repetitions)
|    Control Commands Syntax:
|        play [input_number]
|        pause
|        stop
|        seek [+-](percentage) | [+-](seconds)s | [+-](milliseconds)ms
+----[ CLI commands ]
| add XYZ  . . . . . . . . . . . . . . . . . . . . add XYZ to playlist
| enqueue XYZ  . . . . . . . . . . . . . . . . . queue XYZ to playlist
| playlist . . . . . . . . . . . . .  show items currently in playlist
| search [string]  . .  search for items in playlist (or reset search)
| delete [X] . . . . . . . . . . . . . . . . delete item X in playlist
| move [X][Y]  . . . . . . . . . . . . move item X in playlist after Y
| sort key . . . . . . . . . . . . . . . . . . . . . sort the playlist
| sd [sd]  . . . . . . . . . . . . . show services discovery or toggle
| play . . . . . . . . . . . . . . . . . . . . . . . . . . play stream
| stop . . . . . . . . . . . . . . . . . . . . . . . . . . stop stream
| next . . . . . . . . . . . . . . . . . . . . . .  next playlist item
| prev . . . . . . . . . . . . . . . . . . . .  previous playlist item
| goto, gotoitem . . . . . . . . . . . . . . . . .  goto item at index
| repeat [on|off]  . . . . . . . . . . . . . .  toggle playlist repeat
| loop [on|off]  . . . . . . . . . . . . . . . .  toggle playlist loop
| random [on|off]  . . . . . . . . . . . . . .  toggle playlist random
| clear  . . . . . . . . . . . . . . . . . . . . .  clear the playlist
| status . . . . . . . . . . . . . . . . . . . current playlist status
| title [X]  . . . . . . . . . . . . . . set/get title in current item
| title_n  . . . . . . . . . . . . . . . .  next title in current item
| title_p  . . . . . . . . . . . . . .  previous title in current item
| chapter [X]  . . . . . . . . . . . . set/get chapter in current item
| chapter_n  . . . . . . . . . . . . . .  next chapter in current item
| chapter_p  . . . . . . . . . . . .  previous chapter in current item
|
| seek X . . . . . . . . . . . seek in seconds, for instance `seek 12'
| pause  . . . . . . . . . . . . . . . . . . . . . . . .  toggle pause
| fastforward  . . . . . . . . . . . . . . . . . . set to maximum rate
| rewind . . . . . . . . . . . . . . . . . . . . . set to minimum rate
| faster . . . . . . . . . . . . . . . . . .  faster playing of stream
| slower . . . . . . . . . . . . . . . . . .  slower playing of stream
| normal . . . . . . . . . . . . . . . . . .  normal playing of stream
| rate [playback rate] . . . . . . . . . .  set playback rate to value
| frame  . . . . . . . . . . . . . . . . . . . . . play frame by frame
| fullscreen, f, F [on|off]  . . . . . . . . . . . . toggle fullscreen
| info [X] . .  information about the current stream (or specified id)
| stats  . . . . . . . . . . . . . . . .  show statistical information
| get_time . . . . . . . . .  seconds elapsed since stream's beginning
| is_playing . . . . . . . . . . . .  1 if a stream plays, 0 otherwise
| get_title  . . . . . . . . . . . . . the title of the current stream
| get_length . . . . . . . . . . . .  the length of the current stream
|
| volume [X] . . . . . . . . . . . . . . . . . .  set/get audio volume
| volup [X]  . . . . . . . . . . . . . . .  raise audio volume X steps
| voldown [X]  . . . . . . . . . . . . . .  lower audio volume X steps
| achan [X]  . . . . . . . . . . . .  set/get stereo audio output mode
| atrack [X] . . . . . . . . . . . . . . . . . . . set/get audio track
| vtrack [X] . . . . . . . . . . . . . . . . . . . set/get video track
| vratio [X] . . . . . . . . . . . . . . .  set/get video aspect ratio
| vcrop, crop [X]  . . . . . . . . . . . . . . . .  set/get video crop
| vzoom, zoom [X]  . . . . . . . . . . . . . . . .  set/get video zoom
| vdeinterlace [X] . . . . . . . . . . . . . set/get video deinterlace
| vdeinterlace_mode [X]  . . . . . . .  set/get video deinterlace mode
| snapshot . . . . . . . . . . . . . . . . . . . . take video snapshot
| strack [X] . . . . . . . . . . . . . . . . .  set/get subtitle track
|
| vlm  . . . . . . . . . . . . . . . . . . . . . . . . .  load the VLM
| description  . . . . . . . . . . . . . . . . .  describe this module
| help, ? [pattern]  . . . . . . . . . . . . . . . . .  a help message
| longhelp [pattern] . . . . . . . . . . . . . . a longer help message
| lock . . . . . . . . . . . . . . . . . . . .  lock the telnet prompt
| logout . . . . . . . . . . . . . .  exit (if in a socket connection)
| quit . . . . . . . .  quit VLC (or logout if in a socket connection)
| shutdown . . . . . . . . . . . . . . . . . . . . . . .  shutdown VLC
+----[ end of help ]
```