For example, video4linux:/dev/video1?width:320&height:240
Note: on the bash command line, & must be escaped as '\&'.
Also, note the use of ':' instead of '=' for parameters.
- Use 'ffmpeg -formats' to see a list of supported protocols and formats.
+ Use 'f-list' to see a list of supported file formats.
+ Use 'vcodec-list' to see a list of supported video decoders.
+ Use 'acodec-list' to see a list of supported audio decoders.
readonly: no
required: yes
mutable: no