Documentation:Modules/dummy
Dummy modules are the VLC equivalent of /dev/null
on GNU/Linux: they represent doing nothing.
Contents
List
Type | Description | Shortcut(s) |
---|---|---|
Access | Dummy input | dummy, vlc |
Access output | Dummy stream output | dummy |
Audio output | Dummy audio output | dummy |
Decoder | Dummy decoder | dummy, dump |
Encoder | Dummy encoder | dummy |
Control interface | Dummy interface | (none) |
Muxer | Dummy/Raw muxer | dummy, raw, es |
Stream output | Dummy stream output | dummy, drop |
Text renderer | Dummy font renderer | (none) |
Video output | Dummy video output | dummy, stats |
Video output (legacy video plugins) | Dummy window | dummy |
Descriptions
Interface
A dummy interface works well with command-line usage. It consumes fewer computing resources, something that can be used to reduce a bottleneck effect during transcoding, or simply when opening a window makes little sense.
This will play an Ogg file with no interface:
$ vlc -I dummy audio.ogg vlc://quit
No window is launched, and control is returned to the calling application after the file plays.
This will play a Schroedinger file with a minimalist interface:
$ vlc -I dummy video.drc vlc://quit
A window with no buttons or toolbars is launched (no skin), because video output requires a window. Hotkeys may be used to control playback by default, something that can be disabled if necessary with --no-keyboard-events
.
Stream output
Doesn't do anything. Can be used to test other stream output chain modules without actually streaming anything.
Options
Dummy decoder
- dummy-save-es <boolean> : Save the raw codec data if you have selected/forced the dummy decoder in the main options. default value: disabled
Video output
- dummy-chroma <string> : Force the dummy video output to create images using a specific chroma format instead of trying to improve performances by using the most efficient one. default value: NULL
Source code
- modules/access/idummy.c (Access)
- modules/access_output/dummy.c (Access output)
- modules/audio_output/adummy.c (Audio output)
- modules/codec/ddummy.c (Decoder)
- modules/codec/edummy.c (Encoder)
- modules/control/dummy.c (Interface)
- modules/mux/dummy.c (Output muxer)
- modules/stream_out/dummy.c (Stream output)
- modules/text_renderer/tdummy.c (Text rendering)
- modules/video_output/vdummy.c (Video output)
- modules/video_output/wdummy.c (Video output for legacy video plugins)
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