Stream Operators

The following operators can be applied to a video, audio or subtitle stream.

select

Maps input container tracks to a video, audio or subtitle stream. For audios stream the operator can select specific audio channels.

The channel object identifies a specific input channel. The object supports the following properties:

For example the following composition selects audio channels by channel number:

---
input:
  container:
  - name: input1
    video:
    - name: v1
    audio:
    - name: surround
      channels: 6
      select:
        channel:
        - 1
        - 2
        - 3
        - 4
        - 5
        - 6
    - name: stereo
      channels: 2
      select:
        channel:
        - 7
        - 8

{
  "input": {
    "container": [
      {
        "name": "input1",
        "video": [
          {
            "name": "v1"
          }
        ],
        "audio": [
          {
            "name": "surround",
            "channels": 6,
            "select": {
              "channel": [
                1,
                2,
                3,
                4,
                5,
                6
              ]
            }
          },
          {
            "name": "stereo",
            "channels": 2,
            "select": {
              "channel": [
                7,
                8
              ]
            }
          }
        ]
      }
    ]
  }
}

route

The route operator routes a video, audio or subtitle stream from an input container to an output container. For an audio stream the operator may route specific input channels.

The channel object allows input channels from different streams to be routed to the output. The channel object supports the following properties:

resample

Resamples a media stream to the target sample rate.

decode

Decodes the media stream samples using a specific decompressor type.

filter

Processes the stream media samples using a specific filter type.

encode

Encodes the media stream samples using a specific compressor type.

layout

Maps a video, audio or subtitle stream to an output container track. For audio streams the operator can layout each audio channel.