Reproduction Steps:

1. Set the project audio settings to 5.1 (Project Settings > Audio > Default Speaker Mode > Surround 5.1)
2. Create dummy Timeline in a scene and add an Audio Track in it
3. In the Recorder window, create a new Movie recorder.
4. Ensure Capture > Include Audio is ticked
5. Ensure you have H.264 MP4 selected in Format > Media File Format
6. Start a normal manual recording (Recording Mode : Manual)

Observed: The recorder stop with 3 errors in the console (see below)

Expected: No error in the console or prevent user to record with settings that are not compatible

Reproduced on:

• Recorder {{3.0.3}}
• Unity {{2021.2.1f1}} (I don't want to install {{{}2019.x{}}})
• Windows

Console errors:
{noformat}
WindowsVideoMedia error 0xc00d36b4 while reading C:\Sandbox\Unity Projects\local_21.3\Recordings\movie_002.mp4Context: IMFSinkWriter::SetInputMediaType (audio, some AAC parameters may be unsupported)
Error details: The data specified for the media type is invalid, inconsistent, or not supported by this object.
Track types:
   Audio Track, type: AAC{noformat}
{noformat}
Error in VideoMediaEncoder::Create create and setting attributes in C:\Sandbox\Unity Projects\local_21.3\Recordings\movie_002.mp4.
{noformat}
{noformat}
[MovieRecorder: Movie] Recording failed. Unable to create encoder: 'MediaEncoder: Output file creation failed for C:\Sandbox\Unity Projects\local_21.3\Recordings\movie_002.mp4'
UnityEditor.EditorApplication:Internal_CallUpdateFunctions (){noformat}
Suggestions for a solution:

• Add a warning
• Force a max of 2 channels
• (implement) multi channel audio ?