# How to accurately measure latency or delay from transcoder input to output

**URL:** <https://community.wowza.com/t/how-to-accurately-measure-latency-or-delay-from-transcoder-input-to-output/38980>\
**Category:** Wowza Streaming Engine\
**Created:** [February 20, 2014, 10:53am UTC](https://community.wowza.com/t/how-to-accurately-measure-latency-or-delay-from-transcoder-input-to-output/38980 "2014-02-20T10:53:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Ferdinand\_Hernandez](https://avatars.discourse-cdn.com/v4/letter/f/c2a13f/32.png) [@Ferdinand\_Hernandez](https://community.wowza.com/u/Ferdinand_Hernandez)\
**Post date:** [February 20, 2014, 10:53am UTC](https://community.wowza.com/t/how-to-accurately-measure-latency-or-delay-from-transcoder-input-to-output/38980/1 "2014-02-20T10:53:43Z")

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Hi Guys,

Is there a procedure on how to accurately test latency/delay on wowza transcoder addon? Maybe something that I can enable in the logs or API to make wowza log the time from the frame being decoded to the final transcoded output?

Regards,

Ferdinand

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**Author:** ![Tim\_Dougherty](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/tim_dougherty/32/596_2.png) [@Tim\_Dougherty](https://community.wowza.com/u/Tim_Dougherty)\
**Post date:** [February 20, 2014, 5:17pm UTC](https://community.wowza.com/t/how-to-accurately-measure-latency-or-delay-from-transcoder-input-to-output/38980/2 "2014-02-20T17:17:03Z")

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Ferdinand,

I am not aware of a technial tool that will fulfill your request. That is not to say one does not exist.

For a live workflow, with access to the broadcast venue, I would use a visual and an audio cue and a stopwatch to make rough measurements. Understandably, when dealing with remote clients, this is not practical, however, a simple approach like this should do the trick.

I am very interested if anyone else has more information on this.

-Tim

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**Author:** ![Richard\_Lanham](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard\_Lanham](https://community.wowza.com/u/Richard_Lanham)\
**Post date:** [February 21, 2014, 1:40pm UTC](https://community.wowza.com/t/how-to-accurately-measure-latency-or-delay-from-transcoder-input-to-output/38980/3 "2014-02-21T13:40:17Z")

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Ferdinand,

You might use the log files to compare with and without Transcoding. That would be the easiest.

Richard

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**Author:** ![Ferdinand\_Hernandez](https://avatars.discourse-cdn.com/v4/letter/f/c2a13f/32.png) [@Ferdinand\_Hernandez](https://community.wowza.com/u/Ferdinand_Hernandez)\
**Post date:** [February 21, 2014, 1:05pm UTC](https://community.wowza.com/t/how-to-accurately-measure-latency-or-delay-from-transcoder-input-to-output/38980/4 "2014-02-21T13:05:46Z")

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Hi Tim,

I was looking at the API documentation and I have found 2 API that might do the trick (ITranscoderVideoEncoderNotify and ITranscoderVideoDecoderNotify). But I’m still looking at how can I use this listener or to what should I attach it to. Would you happen to have any info on this 2 Notifiers? or an example on how to use it perhaps?

Regards,

Ferdinand