5 second delay on TG4?

dowtchaboy

Watching the women's GAA football - it's very good - but as it's on TG4 I'm not getting most of the commentary. So I put on the RTE Radio 1 commentary - and it's crazy - it's 5 seconds ahead of the TV.

I've noticed maybe half a second differences between analogue and digital TVs in the past, but 5 seconds seems excessive.

Ariva 150 receiver, transmitter is Crosshaven.

Any clues?

el pasco

dowtchaboy wrote: »

Watching the women's GAA football - it's very good - but as it's on TG4 I'm not getting most of the commentary. So I put on the RTE Radio 1 commentary - and it's crazy - it's 5 seconds ahead of the TV.

I've noticed maybe half a second differences between analogue and digital TVs in the past, but 5 seconds seems excessive.

Ariva 150 receiver, transmitter is Crosshaven.

Any clues?

TV broadcasts are always behind FM radio and digital tv is even slower again even satellite TV is slower than normal tv due to the vast distance involved

Next time there is a match on both TV and radio there should be the same 5 second difference between them Even DAB radio is a few seconds behind FM

lucernarian

I wonder if it's possible to get a second receiver playing RTE Radio 1 on FM from Saorview, it would negate most or possibly all of the difference??

Sam Russell

dowtchaboy wrote: »

Watching the women's GAA football - it's very good - but as it's on TG4 I'm not getting most of the commentary. So I put on the RTE Radio 1 commentary - and it's crazy - it's 5 seconds ahead of the TV.

I've noticed maybe half a second differences between analogue and digital TVs in the past, but 5 seconds seems excessive.

Ariva 150 receiver, transmitter is Crosshaven.

Any clues?

They need the 5 seconds to do the translation.:D

stereomatic

What did people think of the ref-cam and did you notice the picture quality difference and how somebody was fixing the ref-cam when they came on tor the 2nd half. I think the linesmen were also wearing similar cameras

dowtchaboy

el pasco wrote: »

TV broadcasts are always behind FM radio and digital tv is even slower again even satellite TV is slower than normal tv due to the vast distance involved

Next time there is a match on both TV and radio there should be the same 5 second difference between them Even DAB radio is a few seconds behind FM

Well I understand the trade offs and delays that might be involved in digitising, compression and decompression, but even the delay incurred in satellite relay is of the order of half a second and in this case there is no satellite involved. I expected half or even 1 second delay, not 5. I have noticed the 1 second or so relay in Saorview radio versus FM - drives me nuts when herself has both on in the house at the same time - like being in an echo chamber echo chamber......

JDxtra

To many variables involved. They are never going to try and sync the broadcasts up like that. Only option is for TG4 to carry an interactive red button alternative audio stream like what the BBC do.

watty

Your TV's decoder or set box adds a second or two as does the MPEG4 coder of the broadcaster.

This is why when you channel channels on different transponders or Mux the delay will always be noticeable unlike analogue.

For Radio such delays make for very poor usability so I'm opposed to ANY Digital Radio now, not just DAB. Digital Radio is an inherently inferior experience to AM and FM.

You can get PC / Laptop software to delay sound in/out via sound card. Plug FM or AM radio to sound card Line in and Line out to HiFi.

watty

JDxtra wrote: »

To many variables involved. They are never going to try and sync the broadcasts up like that. Only option is for TG4 to carry an interactive red button alternative audio stream like what the BBC do.

No need for red button. multiple languages is a standard DVB feature.

Antenna

dowtchaboy wrote: »

I've noticed maybe half a second differences between analogue and digital TVs in the past, but 5 seconds seems excessive.

Analogue TV for the past number of years itself had delay - as the distribution to the transmitters was by digital means (MPEG 2 links AFAIK) + add other digital delays for OBs etc. + satellite delay if applicable

Years back TV Outside Broadcasts would have had no (noticeable) delay when EVERYTHING in the broadcast chain was analogue

Its possible to purchase radios with a built in adjustable delay, heres an example

http://www.sportsyncradio.com/

(if purchasing a radio WITH DIGITAL TUNING from USA to use here (Europe) make sure it can tune in 0.1 MHz steps rather than just the US 0.2 MHz steps (FCC planning) on FM - thats the case on FM with some radios - especially car radios - over there, they tune 88.1, then 88.3 then 88.5 etc, missing 88.2, 88.4 etc)


BTW
I did a comparison some months ago between RTE on Saorview and RTE via MMDS (upc), the latter was about 2 seconds AHEAD !

More Music

dowtchaboy wrote: »

Well I understand the trade offs and delays that might be involved in digitising, compression and decompression, but even the delay incurred in satellite relay is of the order of half a second and in this case there is no satellite involved. I expected half or even 1 second delay, not 5. I have noticed the 1 second or so relay in Saorview radio versus FM - drives me nuts when herself has both on in the house at the same time - like being in an echo chamber echo chamber......

For the most part the entire path is digital now, all with their own inherent coding delay.

Whether you watch the game on satellite or not, there is still a satellite involved at the OB site.....

Encoding delay on the uplink at the stadium, time it takes to travel up 36,000 kilometers and back down 36,000 kilometers, decode at the TV studio, process it, encode it again for distribution and transmit it to your TV. BTW, even your flatscreen TV adds to the delay with all the processing (DSP) on it.

Internet streams of the same station on FM can be up to 20 seconds behind.

fryup

i experience lip sync issues on all saorview channels when using my combo box

the only fix i know is switching between channels using the recall button, but its annoying