Stream-Observer (strobs)

The script opens mpv with all active (currently streaming) streams from Chaos Computer Club made by VOC (video operation center) in a playlist as found at https://streaming.media.ccc.de. Optionally it can also try to open all streams given in a valid playlist.

First make strobs executable with chmod +x strobs. Then execute ./strobs. Install mpv if not existing.

Usage: strobs [ -d | -D | -f | -h | -j | -k | -m | -n | -p file | -s | -t | -v | -V | -x]

• -d debug mode: print commands and arguments while executed
• -D debug mode: print script lines while read
• -f forces (with -p / -j) open playlist / download full json
• -h help shown
• -j json export to disk
• -k keys/shortcuts shown (input.conf needed)
• -m man page shown (strobs.1 needed)
• -n name stream with technical extension
• -p playlist file with servers in format m3u8
• -s sort server list alphanumerical
• -t timetable of running and coming events shown
• -v verbosity increasing with _v_
• -V version print
• -x exit before mpv, keeps current-playlist.m3u8

The script downloads http://live.ber.c3voc.de:7999/status-json.xsl and searches for active (current streaming) streams. It reads then https://streaming.media.ccc.de/streams/v2.json and extracts end time of the streams and their display names. With this informations it builds a playlist in m3u8 format and starts mpv with this playlist.

• strobs - opens current streams in mpv.
• strobs -p 36c3.m3u8 -s - uses the playlist 36c3.m3u8 for mpv. In addition it will sort the returned streams alphanumerical.
• strobs -j -f - will download and save status_liveber.xsl, status_ingest.xsl, current.json and exit before opening mpv. In addition it will save json including past events.

• current-playlist.m3u8 - generated playlist while running
• input.conf - user-defined key bindings for mpv
• keys.lua - script with key bindings for audio, video and rooms
• strobs - the shell script to execute
• strobs.1 - man page
• voctocat.png - image used as last playlist item, so mpv does not stop

Only strobs is absolutely necessary observe running voc video streams.

• 1 – 0 room number 1 to 10
• q select native audio
• w select translation 1
• e select translation 2
• y select video mixer output
• x select slides

• RIGHT seek 5
• LEFT seek -5
• UP seek 60
• DOWN seek -60
• Shift+PGUP seek 600
• Shift+PGDWN seek -600
• SPACE cycle pause
• > playlist-next; skip to next room
• < playlist-previous; skip to previous room
• i toggle transport osd
• I (upper i) toggle display stats
• ctrl++ add audio-delay 100ms; this changes audio/video sync
• ctrl+- add audio-delay -100ms
• m cycle mute
• d cycle deinterlace
• # cycle audio
• _ cycle video
• f cycle fullscreen
• s screenshot
• F8 show rooms
• F9 show list of audio/sub streams

It is starting a playlist in mpv with following options:

• –fs
  • full screen
• –no-ytdl
  • disable the youtube-dl hook-script (404 should try next stream immediately)
• –msg-level=all=error,ffmpeg=fatal
  • all modules just error messages, but ffmpeg/video fatal (because of permanent irrelevant PoC errors)
• –no-input-default-bindings
  • deactivate all default key bindings
• –input-conf=${progpath}input.conf
  • look for configuration file in the same directory where strobs is starting
• –load-scripts=no
  • don't load any scripts from personal config
• –scripts=keys.lua
  • load these script:${progpath}keys.lua
• –force-window=immediate
  • create the gui immediately on program start
• –keep-open=always
  • don't terminate if the current file is ending and playback will never automatically advance to the next file
• –idle=yes
  • wait idly instead of quitting when there is no file to play
• –vd-lavc-show-all=yes
  • don't wail until an initial keyframe was decoded for a quicker startup
• –no-initial-audio-sync
  • audio is started immediately even if start timestamp differs from video, if necessary video timing is gradually adjusted
• –audio-stream-silence=yes
  • when pausing playback or stop and restart audio on seeks, audio is not stopped and silence is played
• –demuxer-cache-wait=no
  • don't read data until the demuxer cache has reached maximum capacity
• –screenshot-format=png
  • set the screenshot image file type to png (default: jpg)
• –script-opts=osc-visibility=always
  • visibility mode of on screen controller
• –osd-duration=5000
  • set the duration of the OSD messages in ms (default: 1000)
• –osd-msg1=“room: 1 – 0       audio: q, w, e - Native, Translated 1, Translated 2       video: y, x - HD, Slides”
  • show this string as message on OSD with OSD level 1 (visible by default)
  • used as minimal manual
• –no-osd-bar
  • disable display of the OSD bar while seeking
• –osd-font-size=30
  • specify the OSD font size (default: 55)
• –osd-spacing=1
  • horizontal OSD font spacing in scaled pixels (default: 0)
• –osd-border-size=1
  • size of the OSD font border in scaled pixels (default: 3)
• –osd-margin-x=10
  • left and right screen margin for the OSD in scaled pixels
• –osd-margin-y=4
  • top and bottom screen margin for the OSD in scaled pixels