CEA-608/708 subtitles support in SLDP

CEA-608/708 closed captions are now supported in SLDP low latency playback protocol by Softvelum, in both Nimble Streamer and SLDP HTML5 Player.

The pipeline works as follows:

1. Closed captions are delivered in NAL units of your content via any live streaming protocol supported by Nimble Streamer, including SRT, RTMP, MPEGTS and others.
2. Nimble Streamer delivers the content via SLDP as usual.
3. SLDP HTML5 Player recognizes subtitles in the stream.
4. End user may enable subtitles display and watch video with closed captioning.

Notice that subtitles processing works only with SLDP Player SDK which is available as a premium product. Learn more about HTML5 Player SDK here. You can subscribe to SDK in order to generate the package for your domains and get our team's support going forward.

You can try this feature with our players testing free page before purchasing the SDK.

Please also take a look at Subtitles digest page to see what else Nimble can do for you.

Let us know if you have any questions about closed captioning in Softvelum products.

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HEVC support in Chrome

Bitmovin has recently pointed out that Google Quietly Added HEVC Support in Chrome. Also, Jan Ozer made an analysis of current state of HEVC support. This means that it should be able to process HEVC live and VOD content via MPEG-DASH and HLS. So our team has run tests on all available devices to make sure it work as the expected.

We found the following conditions work fine for HEVC playback in Chrome:

• You have the latest Chrome browser (at least version 107)
• Your device has hardware decoding of HEVC

The latter point proved to be important as not all devices has built-in decoding capabilities for HEVC.

With the above conditions met, we could play HEVC on Windows, Linux, Mac, Android and iOS.

Re-package with Nimble Streamer

On Nimble Streamer side we've added HEVC support a long time ago so. You can do various processing and delivery combinations.

For HEVC VOD content file you can simply perform on-the-fly re-packaging into VOD MPEG-DASH and into fMP4 VOD HLS. Notice that fMP4 container in preferred for HLS HEVC playback.

For live streams, you can take streams via any incoming protocols which support HEVC, those are RTSP, MPEG-TS, SRT, RIST from any source. You may also send HEVC via RTMP as non-standard feature. If you use Nimble Streamer to receive input from WebRTC source with WHIP signalling you can send WebRTC with HEVC from Apple devices.

As an output you have MPEG-DASH and fMP4 protocols:

• Check our fMP4 HLS live streams re-packaging article. Also read How to Create a Live HLS Feed With HEVC article by Jan Ozer.
• MPEG-DASH is generated simply from any live source, check RTMP to DASH re-packaging as example.

Encode with Nimble Live Transcoder

If your live source provides the content encoded with other supported codecs, you can transcode it with Nimble Live Transcoder, a premium add-on for Nimble.

From Live Transcoder perspective, HEVC is just another codec to provide as output. Currently HEVC can be encoded with the following libraries:

• NVidia NVENC hardware encoding accelerators
• Intel QuickSync hardware acceleration
• SVT-HEVC software library

Having the content encoded with HEVC codec, you can deliver it to Chrome with MPEG-DASH and fMP4 HLS protocols as described in re-packaging section above.

Take a look at Nimble Streamer HEVC support digest page for other details.

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