3rd monitor delay problem

[zvit]

Yesterday, I attached a 42' LED TV via HDMI to my computer as a third screen. If I play anything with any media player, other than KMplayer, there is a sync offset of about half a beat in the audio and video. When playing anything with KMplayer, everything is synced to the beat, so this is ok.

My problem is that EDIUS has the same problem as the other players. When I put the timeline preview window onto the big screen, (for one cam edit or multi cam editing) there is that half-beat sync offset and I can't edit that way, when I can't see the sync correctly.

Is there anything to do about this?

[GrassValley_SL]

Yes :
1 remove the third monitor :)
2 if you need a third monitor maybe you should think about adding a spark which will display you video and audio in perfect sync.

[PaulTV]

You need an audio delay unit as the external panel has a processing delay of around 25-40ms. This is not the response time of the screen which most people mistake for the processing duration.

I use a JS Technology Optical Delay -

http://www.js-technology.com/store/p...?id_product=21

Output from a Spark is in sync after it leaves the card - but not after you stuff the video into any non tube monitor.

read my blog here: http://indiestereographer.blogspot.c...c-i-often.html

Paul :-)

[zvit]

Thanks. Just if all that is so, how does KMplayer get a perfect sync? Also, how is this connected? eg: Computer>Device(HDMI)>TV(RCA)

[PaulTV]

A number of players have delay settings, just as MPC player has a 12ms default setting - with adjustment available over a wide range - maybe your KMPlayer is the same, not sure I never tried it.

I take optical out of the computer and feed to the delay unit then into the playback audio system - then adjust the delay accordingly using a sync file I made - I have only optical audio.

If you feed HDMI from the Spark to your big screen and listen to the sound from the TV speakers it may or may not be in sync anyway - generally, manufacturers don't care about 25ms as most people don't notice this at all.

Hell, most users watch their TV's with distorted images anyway - incorrect aspect, out of sync sound - the general user has no idea of the shape of a human head, sound sync or audio quality.

Paul - Previous Abbey Road Studios Engineer.

[GrassValley_BH]

Are you using the digital audio from the HDMI, or analog audio straight from the PC?

[zvit]

Are you using the digital audio from the HDMI, or analog audio straight from the PC?

One HDMI cable straight from PC to TV. I don't think there is a way to send the audio to the TV from the PC through the HDMI cable, even though HDMI carries audio too. If you know a way, please tell me. Now I am listening to the analog audio from my pc speakers. (which most probably is the cause of the problem).

[zvit]

Ok, got it! simple adjustment in the Windows Control panel! Now digital audio is sent to TV via the HDMI cable and there is no sync issue.

The only problem with this is that now the sound is coming from the TV, which is all the way to the left of me and I don't hear it stereo. I guess the solution would be to connect some surround system to the tv and set it up around the room.

[Jerry]

I have my audio from the Spark card going to the TV as well. Also, I have the rca leads hooked to my M-Audio Speakers.

[zvit]

Ok, so I have the PC sound going to the TV via HDMI. Now I want to connect a surround system to the TV so I can hear better audio (The audio from the TV's speakers is crap), but I can't seem to get the audio out of the TV. I tried the RCA "audio out" but it's not working. It's like it won't take the audio that's coming in via the HDMI and outputting it to RCA. Is there a way to do this?

[PaulTV]

Fortunately my big panel has an optical output which does work from the HDMI in, but there's still a panel process delay to account for - maybe you have a menu set up that allows the RCA output to be driven by a particular input..

It's such a pain to get audio monitoring perfectly in sync.

Paul :-)