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How to Verify Audio Channels and Sample Rate in Videos for OBS Streaming

See how to compare OBS audio settings with the properties FFprobe reports for a recorded video, and diagnose common mismatches.
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Check OBS’s configured audio settings, then inspect the audio stream in a representative recording. The first check tells you what OBS is set to use; the second verifies what the encoded file actually contains. Those values can differ if OBS processes, resamples, or downmixes audio.

1. Check OBS’s configured audio settings

  1. Open OBS Studio and select Settings > Audio.
  2. Note the configured Sample Rate and Channels. These are OBS settings, not confirmation of the properties in an already-recorded or encoded file. The labels appear in OBS’s audio settings; installed-version details may vary. OBS English UI localization.

2. Inspect a representative video with FFprobe

Use FFprobe, included with FFmpeg, to examine the audio stream in an existing video or a short test recording. For example, run:

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ffprobe -v error -select_streams a:0 -show_entries stream=sample_rate,channels,channel_layout -of default=noprint_wrappers=1 input.mp4

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Replace input.mp4 with the path to your file. The command selects the first audio stream and asks FFprobe to report its sample rate, channel count, and channel layout when available. If a file has multiple audio streams, inspect the stream you actually intend to use; a:0 means the first audio stream, not necessarily every stream in the file. FFprobe reports media stream information, and FFmpeg documents channel layouts. FFprobe documentation; FFmpeg all-options documentation.

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Read the three properties separately

  • Sample rate: The stream’s audio sampling rate, reported in hertz (for example, as a numeric value).
  • Channels: The number of audio channels in the stream.
  • Channel layout: The roles or arrangement of those channels, reported with names such as mono or stereo when known. A channel count and a layout are related but not interchangeable: the count says how many channels there are; the layout describes their roles.

A missing or unreported layout is not proof that the file has a particular layout. Compare the values FFprobe actually reports and avoid inferring audio properties from the video’s resolution or frame rate.

3. Compare the file with your intended result

Compare the recording’s reported sample rate, channel count, and layout with the result you intended. If you are comparing a source file with an OBS recording, inspect both with the same tool and compare the same audio stream where possible. Also account for whether OBS processed or downmixed the source. A setting in OBS, a source’s label, an audio meter, or the container name alone does not establish the final encoded stream properties.

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Why the source, OBS, and recorded file can differ

OBS documents automatic remixing or resampling when a source’s sample rate or channel count differs from its audio backend configuration. Its Audio Mixer Guide says OBS defaults to stereo and provides a Downmix to Mono option that can force one-channel source audio to two channels. As a result, the source’s original presentation may differ from what the mixer or output represents. Check the documentation for the OBS version you use, since the backend description is versioned. OBS Audio Mixer Guide; OBS Backend Design.

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Hardware capabilities can also affect capture-device settings. FFmpeg’s device options include sample rate and channel count, but a device may fail when asked to use unsupported options. The exact controls and capability checks depend on the device and operating system; confirm those in the relevant device documentation rather than assuming that a requested setting was accepted. FFmpeg device documentation.

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Verify after changing settings

  1. Change the relevant setting in OBS or your capture setup.
  2. Make a new, representative recording using the sources and routing you plan to stream.
  3. Run FFprobe on that output and compare the reported sample rate, channels, and layout against the intended result.
  4. If it still differs, check whether OBS is remixing or resampling the source, whether Downmix to Mono is enabled, and whether the device supports the requested configuration.

There is no universal sample-rate recommendation established for every microphone, interface, source, or delivery destination. Follow the requirements of the destination you are targeting, then verify the resulting file.

Troubleshooting common mismatches

What you see What to check
The file’s sample rate differs from the OBS setting. Check whether the source and OBS backend use different rates and whether OBS resampled the audio. Inspect a new output file rather than relying on the setting alone.
The file has two channels, but the source is mono. Check OBS’s mixer behavior and whether Downmix to Mono is active. OBS documents a stereo default and a mono-downmix option; verify how your installed version and routing handle the source.
The channel count is present, but the layout is missing or unexpected. Distinguish the numeric count from the layout description. Inspect the intended audio stream and compare the source and output; a count alone does not identify channel roles.
A requested device rate or channel count fails. The device may not support that option. Check device capabilities and its operating-system-specific controls; unsupported FFmpeg device options can fail.
The OBS settings look right, but the recording does not. Inspect the encoded file with FFprobe, confirm you selected the correct audio stream, and check for source processing, remixing, or resampling.
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