Audio Video Sync Test Video Download
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- Audio Video Sync Test File Download
- Audio Video Sync Test Video Download Mp4
- Audio Video Sync Test Video Download Free
Why does audio and video sync matter in mimoLive?
Without knowing what capability you have to play back downloaded files, or the content of the video and audio you have issues (and what you are using for audio playback) without this it's not possible to comment. In the end your displays video processing delay wiil take longer than the audio processing).
The sync between audio and video is essential to any video production. Your audience will notice if the video signal and the audio signal aren't played back at the same time at their playback device.
The problem of keeping audio and video in sync arises from the fact that those signals are processed individually in mimoLive because they may come in from different hardware sources with different signal delays. Video cameras tend to have more latency in the signal because of buffering and the complex compression process of the video signal. Where as audio signals usually are processed with low latency. So we need to make sure in mimoLive to sync back audio and video to accomplish the perfect experience for your audience.
There are two ways to fix this sync problem:
- You can feed your audio into the video camereas audio in port and lets travel the audio signal along with the video signal from the camera to mimoLive. Then they are in sync by default.
- You need to either delay the audio signal or (less common) delay the video signal in mimoLive.
Use the AV Sync Meter layer to measure the signal difference and get back in sync
We designed a layer called 'AV Sync Meter' that will help you in figure out which signal either audio or video is delayed.
- Open the document in mimoLive which you use to produce your video.
- Find the 'AV Sync Meter' layer in the Layer Repository and add it on top of your Layer Stack (see Layers, Settings and Variants to learn how to do this)
- Configure the newly added layer with your video source and your audio source you want to meter
- Switch the layer live
- Download this video to a movie device in order to be able to play it back in front of the video camera. Make sure that the white noise sound is coming through the audio input you want to detect.
For your convenience scan this QR code on your mobile device to start the download of the video:
- Aim your camera on the mobile device so that the cross hair of the layer can detect the black and white switches in the movie.
- The layer should now display which signal is 'to early' and for which time interval.
What to do if audio is to early and video is delayed?
If the AV Sync Meter looks like this ('Audio to early' message appears) then you need to delay your audio source. This can be done in the settings panel of your audio source:
- Find the audio source you want to sync in the Source Repository and select it. The source should disclose its settings panel. (see Sources and the Sources Repository )
- Select the gear icon right next to the audio device popup. The device settings for the chosen audio device should popup in a popover window.
- Find the 'Delay' option at the bottom and add the meassured amount of the audio beeing to early to the current value.
Now your audio should be in sync with the video. For verification do the measuring with the AV Sync Meter Layer again. Google english to hindi translate download.
What to do if video is to early and audio is delayed?
Actually this should be rarely the case. However mimoLive has an option to delay a video as well.
- Find the video source in the source repository in the left column that is to early and select it by clicking on it.
- Click on the 'fx' icon in the upper right corner of the source info box to reveal a list of video filters that can be applied to a video source.
- Find the Video Delay filter and click on it in order to apply it to the video source.
- To configure the needed delay, you need to calculate how many frames the video source should be delayed. (the delay only can happen in integers values on the base of the 'frames per second' of the video source) E.g. if your video source is 0.5 seconds to early and it is running at 30 fps then your delay needs to be 15 frames.
- To enter the amount of delayed frames your video source needs click on the action gear button next to the Video Delay filter. A configuration sheet will popup showing the delayed frames.
- Enter the calculated amount of delayed frames and close the popup.
You may want to do your Audio Video Sync test again to make sure that the audio and video is in sync now.
What's Next
Read the following page to learn how to work with Layers, Settings and Variants in mimoLive.
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post #1 of 11Old02-10-2006, 03:25 AM - Thread Starter
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Audio Video Sync Test File Download
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After reading about lip-sync issues on many DVD player models and experiencing it myself on my new Oppo DV971H, I realized measuring audio-video lag is pretty difficult using regular content such as movies. So with the help of a few editing tools, I threw together a simple - but I believe effective - A/V sync test DVD.
You can download the zipped DVD from:
A/V Sync DVD at Upload2.com [40MB]
(if you have trouble downloading, try temporarily disabling your popup blocker)
Just use your favorite DVD burning software to burn the VIDEO_TS folder to a DVD disc. If you don't know how to burn video DVDs - well, this may not be the best place to start learning.
The DVD is NTSC, 16:9 enhanced, and progressive. Because the maximum framerate of an NTSC DVD is 29.97 fps, the minimum measurable interval between frames is 1/30th of a second - or 33.3 msec.
The test video consists of a static horizontal line with 30 vertical marks spread evenly along the horizontal axis. See screenshot in attachment. An arrow moves horizontally from left to right at the speed of one full screen length per second. Every time the arrow reaches the center vertical mark - a short beep is heard.
The beeps come in different intervals. It starts with 1 beep every second for 12 seconds. Then it slows down to 1 beep every 2 secs for the next 12 seconds. Finally, it's 1 beep every 4 seconds for 12 seconds. Why did I do this? 1 second is a pretty short time so concentrating on the beep can be difficult when it's coming at such rapid pace. I figured some variety might help. Sounds complicated? Just play the DVD and it'll make sense.
This makes testing A/V lag pretty easy. Just play the DVD, watch, and listen. Ideally you should be hearing the beep right as the moving arrow crosses the center mark. If you hear it noticeably before or after - you have an A/V sync problem. Try to determine how many marks before or after the center mark the beep is heard. Multiply that number by 33.3 msec - and the result is your audio/video lag time. You will need to compensate for this lag either in your DVD player setup or your audio receiver setup. Neither may necessarily be possible - so check your manuals first before wasting any time.
I've included Dolby Digital 2.0, Dolby Digital 5.0 and LPCM soundtracks on the disc.
I hope this helps! Please let me know if you're having trouble with the downloads and perhaps we can find an alternate place to host the file. It's not terribly big - only 40 megs, but it could potentially be a lot of server bandwidth if many people download it.
You can download the zipped DVD from:
A/V Sync DVD at Upload2.com [40MB]
(if you have trouble downloading, try temporarily disabling your popup blocker)
Just use your favorite DVD burning software to burn the VIDEO_TS folder to a DVD disc. If you don't know how to burn video DVDs - well, this may not be the best place to start learning.
The DVD is NTSC, 16:9 enhanced, and progressive. Because the maximum framerate of an NTSC DVD is 29.97 fps, the minimum measurable interval between frames is 1/30th of a second - or 33.3 msec.
The test video consists of a static horizontal line with 30 vertical marks spread evenly along the horizontal axis. See screenshot in attachment. An arrow moves horizontally from left to right at the speed of one full screen length per second. Every time the arrow reaches the center vertical mark - a short beep is heard.
The beeps come in different intervals. It starts with 1 beep every second for 12 seconds. Then it slows down to 1 beep every 2 secs for the next 12 seconds. Finally, it's 1 beep every 4 seconds for 12 seconds. Why did I do this? 1 second is a pretty short time so concentrating on the beep can be difficult when it's coming at such rapid pace. I figured some variety might help. Sounds complicated? Just play the DVD and it'll make sense.
This makes testing A/V lag pretty easy. Just play the DVD, watch, and listen. Ideally you should be hearing the beep right as the moving arrow crosses the center mark. If you hear it noticeably before or after - you have an A/V sync problem. Try to determine how many marks before or after the center mark the beep is heard. Multiply that number by 33.3 msec - and the result is your audio/video lag time. You will need to compensate for this lag either in your DVD player setup or your audio receiver setup. Neither may necessarily be possible - so check your manuals first before wasting any time.
I've included Dolby Digital 2.0, Dolby Digital 5.0 and LPCM soundtracks on the disc.
I hope this helps! Please let me know if you're having trouble with the downloads and perhaps we can find an alternate place to host the file. It's not terribly big - only 40 megs, but it could potentially be a lot of server bandwidth if many people download it.
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Audio Video Sync Test Video Download Mp4
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Nice! You may want to cross post (copy and paste) this in the 'Calibration Forum'. I copied the file with no problem - 450KB/sec.
larry
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I think the GetGray calibration disc also has some A/V sync tests, There is a small Paypal donation required for the Get Gray disc, which is more than reasonable considering what the GetGray disc offers.
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Nice work Zambelli. How sure are you that the audio and video sync is 100% accurate after encoding?
The DVE disk has an A/V timing clock that is supposed to do the same thing. However, it appears that the timing is different for each of the DD-2.0, DD-5.1 and DTS-5.1 soundtracks. None of them are syncronised 100%.
The DVE disk has an A/V timing clock that is supposed to do the same thing. However, it appears that the timing is different for each of the DD-2.0, DD-5.1 and DTS-5.1 soundtracks. None of them are syncronised 100%.
post #6 of 11Old02-10-2006, 02:50 PM - Thread Starter
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Originally Posted by GSB Nice work Zambelli. How sure are you that the audio and video sync is 100% accurate after encoding? |
Any discrepancy between DD2.0, DD5.0 and LPCM will probably be due to different sized packets and decoding complexity.
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Downloaded and burned successfully. Interesting to see that I get a slight video delay (looks like one tic mark worth) when having the projector deinterlace instead of my dvd player. Using my old 480i CRT as a benchmark (no processing there) it seems like the DVD sync itself is OK.
During the LPCM tests, anyone else seeing the beep change to a pop at about 15 seconds in? The other tests work great for me.
THANKS! Neat test disc.
During the LPCM tests, anyone else seeing the beep change to a pop at about 15 seconds in? The other tests work great for me.
THANKS! Neat test disc.
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Thanks for making this tool. I have an OPPO 971 and occasionally have sync problems.
Is there a way for the syncingto change? The reason I ask is that, I usually have oppo set to zero delay, but put in on 50ms delay for some reason. When I played sync test it still showed being out of sync, by about 30ms.
That seem curiuous to me so I set oppo to 10ms. Seemed to be much better. then re-checked, after turning everything off and back on, and Oppo was still set to 10, but a/v sync showed almost 30 ms again. (first tick to the left).
Just wondring if DVD players drift in and out of sync. I do experience intermittent sync problems with oppo, but usually its rare that I see it.
Thanks agin for the test file. I've been wanting something like this to quantify sync.
Rick
Is there a way for the syncingto change? The reason I ask is that, I usually have oppo set to zero delay, but put in on 50ms delay for some reason. When I played sync test it still showed being out of sync, by about 30ms.
That seem curiuous to me so I set oppo to 10ms. Seemed to be much better. then re-checked, after turning everything off and back on, and Oppo was still set to 10, but a/v sync showed almost 30 ms again. (first tick to the left).
Just wondring if DVD players drift in and out of sync. I do experience intermittent sync problems with oppo, but usually its rare that I see it.
Thanks agin for the test file. I've been wanting something like this to quantify sync.
Rick
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Originally Posted by Hearn Downloaded and burned successfully. Interesting to see that I get a slight video delay (looks like one tic mark worth) when having the projector deinterlace instead of my dvd player. Using my old 480i CRT as a benchmark (no processing there) it seems like the DVD sync itself is OK. |
Another thing to keep in mind: MPEG decoders in DVD players fairly regularly introduce sync errors, so it is not really possible to check the sync of the DVD itself, by using a DVD player and CRT. You would have to decode the DVD with a computer program that is capable of analysing the audio and video timing.Gary
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Originally Posted by GSB Another thing to keep in mind: MPEG decoders in DVD players fairly regularly introduce sync errors, so it is not really possible to check the sync of the DVD itself, by using a DVD player and CRT. You would have to decode the DVD with a computer program that is capable of analysing the audio and video timing. Gary |
Audio Video Sync Test Video Download Free
Anyone else get a 'click' instead of beep on the LPCM test track 15 seconds in? I'm wondering if i should try to chase down the issue.. . the other two work great.
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