Audio Troubleshooting

No Audio Output

Step 1 — Check the audio interface and device

1. Open ☰ → Settings → Audio.
2. Check Audio interface (Windows Standard Audio Device or ASIO). With ASIO, check that the right ASIO Device is selected; with the Windows device, Exaplay plays on the Windows default playback device.

Step 2 — Check the clip volume

1. Select the clip in the Timeline.
2. In the Inspector, confirm Volume is above 0 %.
3. Confirm the track is not muted (the speaker button in the track header).

Step 3 — Check the master volume

Confirm that neither the Master volume (☰ → Audio Mixer), the Output trim (☰ → Settings → Audio) nor the Composition volume fader in the Transport is at zero.

Step 4 — Check the output channels (ASIO)

With ASIO, check the First Ch of the clip, track or composition in the Inspector, and the faders in ☰ → Audio Mixer. See Audio → Output channel routing.

On Dante, a moving meter in the Audio Mixer means Exaplay plays — check the subscriptions in Dante Controller next. See Dante Audio → Troubleshooting.

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Audio Dropout or Clicking

ASIO driver:

1. Open the ASIO driver's own control panel (the vendor's software — the buffer size is not set in Exaplay).
2. Increase the buffer size (e.g. from 128 to 256 or 512 samples).
3. Reducing the buffer size lowers latency but increases the risk of dropouts. Use the smallest buffer that is stable.

CPU overload:

1. Check the Performance Diagnostics panel — if CPU > 75 %, the audio thread may be starved.
2. Reduce the number of decoding video streams.
3. Switch video to HAP codec to free CPU cycles.

Sample rate mismatch:

1. With the Windows Standard Audio Device, set Sample Rate in ☰ → Settings → Audio to the media's rate; with ASIO, set the rate in the driver's control panel.
2. A clip whose rate does not match the output is named in a warning at the bottom of the Audio tab.

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Audio Plays on Wrong Channels

1. Select ASIO as the Audio interface — the channel selection is only available with ASIO.
2. Check the First Ch of the clip, track or composition in the Inspector.
3. Ensure the channel numbers in Exaplay match the physical connections on the interface, and check the faders in ☰ → Audio Mixer.

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LTC Timecode Not Received

1. Confirm the LTC source is physically connected to the correct audio input channel.
2. In ☰ → Settings → Timecode, set Timecode Mode to Receive LTC, Linear Timecode and check the input device and Input Channel under LTC Settings.
3. Verify the timecode Framerate matches the source.
4. Check the audio cable for noise (LTC is sensitive to ground loops — use balanced connections).
5. Open the Monitor's Timecode view: the IN card shows the LTC signal level, the channel it listens on and whether it is receiving / locked. No level means the LTC signal is not reaching Exaplay. See Monitor → Timecode IN / OUT.

See Timecode Sync → Receive: LTC.

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Audio from a Specific Video Not Playing

Some video containers embed audio in formats not supported by the Exaplay audio decoder:

Container	Common issue	Fix
.mov HAP	HAP files can carry audio and Exaplay plays it (the built-in HAP encoder copies it); only the file's first audio stream plays	If the file has several audio streams, put the one you need first, or use a separate WAV
.mp4 AAC > 48 kHz	High sample rate	Re-encode at 44100 or 48000 Hz
.mov AC3	AC3 not supported	Convert to AAC or PCM WAV

Re-encode the audio with FFmpeg:

ffmpeg -i input.mov -c:v copy -c:a pcm_s16le -ar 48000 output.mov