Audio encoding parameters
| Parameter | Description |
|---|---|
| Codec | Specify the codec for the audio encoding. 'Passthrough' is not supported when audio input is uncompressed. For PCM or Dolby E Passthrough, select 'SMPTE302 / Dolby E Passthrough'. Dolby AC4 can only be used for demo. |
Pass-through specific parameters
| Parameter | Description |
|---|---|
| Insert audio frames on signal loss | Generate audio frames according to the input loss management configured in Media processing tab (silence, 1kHz tone) when the input source is lost. Note: If you activate this option, associated monitoring statistics are available from the Service statistics (see example below). |
| Glitch supression** | Only available if Insert audio frames on signal loss** is checked. Repeat 3 audio frames before enabling input loss audio frames generation. |
| Generate audio frames if no source at start** | Only available if Insert audio frames on signal loss** is checked. If the audio service is missing at startup, generate audio frames according to the input loss management configured in Media processing tab (silence, 1kHz tone). Frames may be encoded in a different codec from the real audio. Note: Applies to both use cases where Live Encoder is configured either with SDI or as IP input. |
Example of audio silence generation statistics
SMPTE-302 Pass-trough additional parameters
| Parameter | Description |
|---|---|
| Data Width | Data width of AES audio sample to be encoded. Possible values: Follow input, 16-bit, 20-bit, or 24-bit |
MPEG-1 Layer II, Dolby Digital, Dolby Digital Plus, Dolby AC-4 parameters
| Parameter | Description |
|---|---|
| Watermarking | Type of watermarking insertion to use |
| Channels mode | Number of audio channels in the encoded audio track |
| Bit rate | Bandwidth used to encode the audio stream |
| Sampling rate | Number of audio samples per second defined in Hz |
| Frame rate | Frame rate as defined in video input |
| Blackout | This blackout configuration will be applied to the related audio/video stream. |
Dolby Digital additional parameters
| Parameter | Description |
|---|---|
| Dialog normalization | Metadata parameter that controls playback gain.Possible values: Auto or, from -1 dB to -31 dB Auto means that no processing will be done on the input. |
| Dolby Surround mode | Decoders can use this flag to automatically switch on Pro Logic decoding. |
| DRC Line Mode Profile | The Dynamic Range Control restricts the signal's absolute peak level for a decoder using the line mode. |
| DRC RF Mode Profile | The Dynamic Range Control restricts the signal's absolute peak level for decoder using the RF mode. |
| DC highpass filter | A DCblocking 3Hz highpass filter applied on the main Dolby channel. Used to remove DC offsets in the program audio. Only switch off in exceptional circumstances. |
Dolby AC-4 additional parameters
| Parameter | Description |
|---|---|
| Language | ISO 6392 language code (3letter code) or 'auto' to set the language as defined in the input. |
| Content classifier | Set the content classifier as defined in ETSI TS 103 190. Dolby recommends setting the editorial classification based on this value. |
Related information
Configure the audio encoding parameters