Transcoding

1. Log on to the Intelligent Media Service console.

2. In the upper-left corner, select a region based on your business needs.

3. In the left-side navigation pane, choose Real-time Media Processing > Template Management.

4. On the Transcoding tab, create a template based on your requirements.

   • Create a Standard Transcoding template

     Preset resolutions include: Fluent (height 360 px), SD (height 432 px), HD (height 648 px), and FHD (height 1080 px).

     Parameter	Description
     Template Name	Enter a name for the Standard Transcoding template.
     Resolution	Preset Resolution: Select a system-preset resolution. Custom Resolution: The width and height can range from 128 to 2,560 pixels (px).
     Bitrate	Enter a bitrate. Valid values: [1, 6000]. Unit: Kbps. Estimate the video bitrate based on the video aspect ratio. The actual bitrate closely matches the specified value but may not be exact, especially if the target value is excessively high or low.
     Frame Rate	Enter a frame rate. Valid values: [1, 60]. Unit: fps.
     GOP Size	Enter a GOP size. Valid values: [1, 3000]. Unit: frames. A larger GOP size increases latency. A smaller GOP size may cause playback stuttering.
     Encoding Format	Select H.264 or H.265.

   • Create a Narrowband HD Transcoding template

     Parameter	Description
     Template Name	Enter a name for the Narrowband HD Transcoding template.
     Resolution	Preset Resolution: Select a system-preset resolution. Custom Resolution: The width and height can range from 128 to 2,560 px.
     Bitrate	Enter a bitrate. Valid values: [1, 6000]. Unit: Kbps. Estimate the video bitrate based on the video aspect ratio. The actual bitrate closely matches the specified value but may not be exact, especially if the target value is excessively high or low.
     Frame Rate	Enter a frame rate. Valid values: [1, 60]. Unit: fps.
     GOP Size	Enter a GOP size. Valid values: [1, 3000]. Unit: frames. A larger GOP size increases latency. A smaller GOP size may cause playback stuttering.
     Encoding Format	Select H.264 or H.265.

   • Create an Audio Transcoding template

     Parameter	Description
     Template Name	Enter a name for the Audio Transcoding template.
     Bitrate	Keep Original Bitrate: Retains the original audio bitrate. Custom Bitrate: Valid values: [1, 1000]. Unit: Kbps.

   • Create a Source Transcoding template

     Parameter	Description
     Template Name	Enter a name for the Source Transcoding template.
     Encoding Format	Select H.264 or H.265.

Call the CreateLiveTranscodeTemplate operation to create a custom template. Set the Type parameter to specify the desired transcoding type.

1. Log on to the Intelligent Media Service console.

2. In the upper-left corner, select a region based on your business needs.

3. In the left-side navigation pane, choose Real-time Media Processing > Job Management.

4. On the Transcoding tab, create a real-time media transcoding job.

   Parameter	Description
   Job Name	Enter a name for the transcoding job.
   Select Template	Select a transcoding type, which can be Standard Transcoding, Narrowband HD Transcoding, Audio Transcoding, or Source Transcoding, and then select a corresponding template.
   Live Stream	Enter a valid live stream URL. Only RTMP is supported.
   Output Stream URL	Select an output stream URL. Only streaming domains created in ApsaraVideo Live are supported. By default, a single domain supports up to 50 concurrent push streams.
   Startup mode	Start Immediately: Once the job is created, transcoding starts immediately. Prepare your stream beforehand to ensure the service can pull the input stream. Scheduled Start: Once the job is created, transcoding starts at the specified time. Prepare your stream a few minutes before the scheduled time. If the stream is not active at the specified time and the job fails to start, you can modify the scheduled start time in the job list.

Call the SubmitLiveTranscodeJob operation to submit a real-time media transcoding job.

1. Log on to the Intelligent Media Service console.

2. In the upper-left corner, select a region based on your business needs.

3. In the left-side navigation pane, choose Real-time Media Processing > Job Management.

4. On the Transcoding tab, find the desired job and click View in the Actions column to view the job details.

   In the job details, the Output Stream URL is in the format rtmp://{DOMAIN}/{APP}/{STREAM}?auth_key={authentication_string}. The following table describes each field.

   Field	Description
   rtmp	The transcoding protocol. Currently, only RTMP is supported.
   DOMAIN	The ApsaraVideo Live streaming domain that you specified when you submitted the transcoding job.
   APP	The application name. The value is fixed as ims-transcode.
   STREAM	The live stream name generated by the Real-time Media Processing service.
   auth_key	The authentication key.
   Authentication string	URL authentication is enabled by default for ApsaraVideo Live streaming domains. For information about how to generate an authentication string, see Components of an authenticated URL.

Call the GetLiveTranscodeJob operation to query a transcoding job by its ID and get the output stream URL.