Transcoding Broadcaster Input Streams

Video Profile

Select an existing profile, select Keep original stream if you do not wish to transcode the video stream, or select Remove stream if you want to remove the video track.

Audio Profile

Select an existing profile, select Keep original stream if you do not wish to transcode the audio stream, or select Remove stream if you want to remove the audio track.

Select one of the following output types. The outputs are configured as part of the transcoding process, so there is no need to create the Output from the Zixi Broadcaster Outputs screen:

• MPEG-TS – the output will be available as MPEG Transport Stream.
• NDI – the output will be available as NDI. When selecting NDI output, you can select the following video/audio profiles:
  • Video profile – remove stream or a Raw profile.
  • Audio profile - remove stream or a Raw profile.
• WebRTC – the output will be available as WebRTC. When selecting NDI output, you can select the following video/audio profiles:
  • Video profile – remove stream, keep original stream, Raw video profile, or if the input stream is not WebRTC compliant, a transcode to WebRTC compliant profile (e.g. H.264 codec with Baseline or Main profile and no B frames).
  • Audio profile - remove stream, keep original stream, Raw audio profile, or if the input stream is non-Opus, transcode to Opus.

Transport Stream Bitrate (Kbps)

Specify the bitrate of the transport stream. This parameter is optional. If you do not specify a TS Bitrate, the stream will be VBR. If you specify a bitrate, the stream will be CBR.

Note – CBR is recommended for downstream satellite workflows.

Select this option to add RTP header to the MPEG-TS packets.

Use Hardware Acceleration (if available)

Select this checkbox to use hardware acceleration component (e.g. NVIDIA) if it has been installed.

Pass all PIDs

Select this checkbox to pass-through all non-transcoded PIDs.

Selecting this option will do the following:

• If a SCTE35 marker is detected and it contains a specific video timestamp (PTS), the encoder will generate an IDR-frame on the video frame with the closest or equal timestamp.
• If there is no timestamp in the SCTE35 marker, the transcoder will generate an IDR frame as soon as it can.

Smoothing Buffer (ms)

Specify how much of the transcoded stream (in milliseconds) to store before transmitting it back to the server in order to prevent bursts.

If the Transport stream bitrate [kbps] field is empty, the smoothing buffer is disabled.

If the Transport stream bitrate [kbps] field is NOT empty, it is recommended to enter around 200ms, which should be enough to prevent bursts.

Cropping Mode

Set the units used for defining the crop. Options are: Pixels or Percentages.

Note: Depending on the type of content, in some cases using different crop values for low resolution outputs might be appropriate.  For example, if the content includes both video content and textual content, the text would not be readable at lower resolutions and thus might be better to exclude.  Another use case for using different crop values for each output would be to slice a 360 or VR input video.

Left, Top

Specify the left and top positions for the crop.

Width x Height

Specify the width and height values for the crop.

Maximum delay [hh:mm:ss]

Specify the time of the delayed transmission of this stream. Maximum: 24 hours.

Multicast Only

Selecting this checkbox will force the transmission of this stream only in multicast. FEC parameters are taken from global multicast pull outputs settings.

Enable Encryption

Select this checkbox to encrypt the Input stream. For more information, see Encrypting an Input Stream in Zixi Broadcaster.

Encryption type (for Encryption enabled)

Specify the type of Encryption (AES 128/192/256).

Encryption key (for encryption enabled)

Click Generate to generate an encryption key. The generated encryption key must be sent to the end-user to decipher the received encoded stream.

Destination Type

Select the radio button for the desired storage type and then fill in the relevant parameters.

·         Record to disk – the recording is saved on the local disk.

·         Record to S3 – the file is saved to your AWS S3 Bucket.

File Name Template

Specify the file name pattern that Zixi will use to generate when saving the recorded content. A separate file will be generated for each recording up to the time specified in the Max recorded file duration parameter (see above). After this duration a new file will be generated.

The file name pattern can include any string and up to five variables listed below. Only the %T=HH.MM.SS creation time is mandatory. You can change the order of these variables and add text as long as you maintain the legitimate structure of the file in Linux and Windows:

·         %S=stream id - optional.

·         %Y=year - optional

·         %M=month - optional

·         %D=day - optional

·         %T=HH.MM.SS creation time - mandatory

For example, the following pattern %Y_recording%T.ts will generate the following file name 2017_recording15:32:35.ts.

Max recorded file duration [hours]

Specify the maximum time allotted for recording a video stream. Default: 2 hours

Keep recorded files for [hours]

Specify the maximum time for storing the recording. Default: 0 hours

Custom Path

Optionally specify a storage location for the recorded files that is relative to the root folder. This location bypasses the location specified as the root folder in the Settings > General screen.

File Name Template

Specify the file name pattern that Zixi will use to generate when saving the recorded content. A separate file will be generated for each recording up to the time specified in the Max recorded file duration parameter (see above). After this duration a new file will be generated.

The file name pattern can include any string and up to five variables listed below. Only the %T=HH.MM.SS creation time is mandatory. You can change the order of these variables and add text as long as you maintain the legitimate structure of the file in Linux and Windows:

• %S=stream id - optional.
• %Y=year - optional
• %M=month - optional
• %D=day - optional
• %T=HH.MM.SS creation time - mandatory

For example, the following pattern %Y_recording%T.ts will generate the following file name 2017_recording15:32:35.ts.

Max recorded file duration [hours]

Specify the maximum time allotted for recording a video stream. Default: 2 hours

URL

Specify the URL of the S3 bucket.

Ignore TLS certificate errors

TLS certificate for S3 bucket might be detected as faulty if bucket name contains dot[s]. When this option is selected, Zixi Broadcaster will ignore the TLS certificate errors and transmit the stream to its destination.

Access Key

The access key that is used for accessing the S3 bucket.

Secret Key

The secret key that is used for accessing the S3 bucket.