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o-ffmpeg: video output via ffmpeg

this is a cli output module, don't use it in the gui! the gui may perform frame drops, especially when the outputs need to be written out and are encoded as we go.

an example command line would be

 vkdt-cli -g /path/to/mlv-sidecar.cfg --format o-ffmpeg --audio audio.raw

note that the sidecar here can be the one you've been using in the gui, i.e. the autogenerated one if you point vkdt to the folder or file will work. the cli will append the necessary processing chain to the graph.

we use plain popen() style communication with the ffmpeg binary (you'll need to have it installed in your PATH for this to work).

this module only writes the h264 stream, the audio channels will need to be combined manually, maybe like

 ffmpeg -i output.h264 -f s16le -sample_rate 48000 -channels 2 -i audio.raw -c:v copy combined.mp4

connectors

  • input the sink to read the raw pixel data

parameters

  • filename the output filename to write the h264 stream to.