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Use Pro Capture card to capture compressed audio

Scenario

Pro Capture cards doesn’t offer the access to capturing compressed audio by default. But users can realize this function by modifying the EDID of the capture card.

Solution

    1. Get the default EDID of the capture card
      1. In your video capture software, select a channel of the Pro Capture card as the video input device, then call the driver panel of capture card.
      2. In the HDMI tab of the driver panel, click Save in the EDID section to save the EDID file of the specified channel to local storage.
      3. If you want to export EDID files for other channels, repeat steps i and step ii.

Use the Pro Capture driver panel to get EDID

    1. Modify the EDID of the capture card
      1. Open the default EDID file in the software AW EDID Editor.
      2. In the Instanciated blocks section in the bottom left area of the CEA Extension tab, select the Audio to open the Audio descriptors page.
      3. In the “Audio descriptors” page, click the “+” button to add an audio descriptor tab. (As shown in the figure below, the new tab’s name is n°3.)
      4. Set the values you need in the audio descriptor tab. In this example, the following parameters are set:
  • Format: AC-3
  • Number of Channels: 6
  • Supported Sampling Frequencies: 32, 44, 48, 88, 96, 176, 192 kHz
  • Maximum Bit Rate: 640 KHz
      1. If you need to add other audio formats, repeat step iv and step v.
      2. Save the modified EDID file.

Modify the audio description of the EDID in AW EDID Editor

  1. Import new EDID into the capture card
    1. In your video capture software, select a channel of the Pro Capture card as the video input device, then call the driver panel of capture card.
    2. In the HDMI tab of the driver panel, click Load in the EDID section to import the new EDID file to the specified channel.
    3. If you want to import the new EDID file into other channels, repeat step i and step ii.
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