Transcoder pink/grey blocking

Wowza Streaming Engine
1

Hello,

we have two servers, each with transcoders running. Both ingest a SRT stream from an adtec afiniti, and transcode these to 5 sub streams for ABR streaming.

After variable hours of flawless streaming, I get a pink/grey blocking. I’m not able to see any useful information in the log files. Streaming Engine Version: 4.8.27+5

Are there any hints how to analyze this in detail?

Thank you,
best regards
Gerhard

vlcsnap-2024-05-16-16h12m26s775
vlcsnap-2024-05-16-16h12m26s7751920×1080 618 KB

2

Hi,

please open a support ticket from your Wowza account, so we can help in your individual use case. Also include your conf and log files please.

Any additional information you can give about the source will also be helpful.

Regards,
Bernd Backhaus
Wowza Support
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3

The 2 likely culprits are transcoding and the adtec encoding. So my first step would be to determine which

a couple things you could try that will show you the content without transcoding…

  1. Watch the adtec feed somehow (unsure if you can also get an rtmp feed of same encoded content but that would be good to watch)
  2. Assuming your ABR ladder in WSE consists of the top rendition being pass-thru, you could play back a non-ABR stream from WSE that consists only of the top rendition. This can be done several ways, but creating a smil file with only the top rendition is probably easiest (I cannot include the link in my post but Google “Wowza how to do adaptive bitrate streaming” and skip to the smil file portion)
  3. Turn on stream recording for the top rendition to create a VOD.

ScottK

4

Hello,

thank you for your reply,

Thank you ScottK, the adtec feed from the encoder via a second IP output looks ok. the not transcoded stream from the WSE is also fine, just the individual transcoded streams which are offered in the ABR have this blocking. I’ll try the recording the next time, I get this error. Thank you!

I’ll also open a support ticket and let you know if I’ll find a solution.

Best regards
Gerhard

5

Hello again,

maybe I’ve figured out a solution. This seems to be a problem with the SRT decryption, Due to internal local streaming there is no encryption necessary, so I’ve deactivated it and right until now there is no blocking.

I’ll have to check this for a longer period. (I’ve not opened an official ticket yet)

Best regards
Gerhard