DrKLO/Telegram · error · ConfigurationException

Invalid output encoding (mode={outputMode}) for: {inputForma

Error message

Invalid output encoding (mode={outputMode}) for: {inputFormat}

What it means

After passthrough/offload setup, DefaultAudioSink validates that the resolved outputEncoding is not C.ENCODING_INVALID. If it is, it throws ConfigurationException('Invalid output encoding (mode=...) for: ...'), indicating the encoding derived from the format/mime type/codecs (or from passthrough capabilities) resolved to an invalid value the AudioTrack cannot use.

Source

Thrown at TMessagesProj/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java:770

        outputEncoding =
            MimeTypes.getEncoding(checkNotNull(inputFormat.sampleMimeType), inputFormat.codecs);
        outputChannelConfig = Util.getAudioTrackChannelConfig(inputFormat.channelCount);
      } else {
        outputMode = OUTPUT_MODE_PASSTHROUGH;
        @Nullable
        Pair<Integer, Integer> encodingAndChannelConfig =
            audioCapabilities.getEncodingAndChannelConfigForPassthrough(inputFormat);
        if (encodingAndChannelConfig == null) {
          throw new ConfigurationException(
              "Unable to configure passthrough for: " + inputFormat, inputFormat);
        }
        outputEncoding = encodingAndChannelConfig.first;
        outputChannelConfig = encodingAndChannelConfig.second;
      }
    }

    if (outputEncoding == C.ENCODING_INVALID) {
      throw new ConfigurationException(
          "Invalid output encoding (mode=" + outputMode + ") for: " + inputFormat, inputFormat);
    }
    if (outputChannelConfig == AudioFormat.CHANNEL_INVALID) {
      throw new ConfigurationException(
          "Invalid output channel config (mode=" + outputMode + ") for: " + inputFormat,
          inputFormat);
    }
    int bufferSize =
        specifiedBufferSize != 0
            ? specifiedBufferSize
            : audioTrackBufferSizeProvider.getBufferSizeInBytes(
                getAudioTrackMinBufferSize(outputSampleRate, outputChannelConfig, outputEncoding),
                outputEncoding,
                outputMode,
                outputPcmFrameSize != C.LENGTH_UNSET ? outputPcmFrameSize : 1,
                outputSampleRate,
                inputFormat.bitrate,
                enableAudioTrackPlaybackParams ? MAX_PLAYBACK_SPEED : DEFAULT_PLAYBACK_SPEED);

View on GitHub (pinned to 45ab8f4308)

Solutions

1. Set a supported sampleMimeType (and codecs string) on the Format so MimeTypes.getEncoding resolves to a valid encoding.
2. Disable offload/passthrough and decode to PCM if the format's encoding cannot be resolved.
3. Check MimeTypes.getEncoding(...) for the format's mime/codecs before configuring the sink.

Example fix

// before
format = new Format.Builder().setSampleMimeType("audio/unknown").build();

// after
format = new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_AC4).build();

// confirm the encoding resolves before configuring the sink
int enc = MimeTypes.getEncoding(format.sampleMimeType, format.codecs);
if (enc == C.ENCODING_INVALID) { /* fix Format mime/codecs or disable offload */ }

try { sink.configure(format, false, attrs); }
catch (AudioSink.ConfigurationException e) { /* fall back to PCM decode */ }

When it happens

Trigger: Offload path: MimeTypes.getEncoding(sampleMimeType, codecs) returns ENCODING_INVALID for an unrecognized/offload-incompatible mime+codecs pair. Passthrough path: a non-null capability pair whose first element is ENCODING_INVALID. Any path leaving outputEncoding unset to the invalid sentinel.

Common situations: Format carries a sampleMimeType not mapped to a known C.ENCODING_* constant; codecs attribute parsing fails to resolve; enabling offload for a codec the platform does not recognize.

Related errors

• Invalid output channel config (mode={outputMode}) for: {inpu
• Invalid sample rate or number of channels: {sampleRate}, {ch
• Unhandled format: {inputAudioFormat}
• Unhandled format: {inputAudioFormat}
• Unhandled format: {inputAudioFormat}

AI-assisted analysis of DrKLO/Telegram@45ab8f4308 (2026-08-14). Data as JSON: /api/errors/b84b216ec03a485d. Report an issue: GitHub.