Question / Help Live Stream Problems (sound, video, sync)

[Andy VanDyke]

Hi !
I've been pulling out my hair trying to figure out how to solve some Live Streat Issues.

First of all - when streaming an existing video I have sound problems (stuttering or missing pieces), video too slow, video and audio not synced.
And second of all when doing a live broadcast, Syncing problems, video too slow, sound breaking off..

I have searched extensively on Google and found several solutions, tried them, experimenten with others and I cannot solve it. It's probably a minor thing.. but what..

I've done 2 tests.
1. Pre recorded video streamed
https://www.facebook.com/andyvandijk/videos/10211567344202111/

2. Live video streamed
https://www.facebook.com/andyvandijk/videos/10211567283160585/

I've also got a log report from both streams which I will attach.
+++
I'm working on a MacBook Pro late 2007
Intel Corer 2 Dueo
2.4 Hz
I upgraded the memory to 8 GB
and I installed a 500GB SSD

I'm using a LED Cinema Display
Resolution 1920x1200

+++

I hope someone can help me.. I am pretty good with computers, but very new to video so most of the things are read are a bit foreign to me - So simple language would be greately appreciated :)

Thank you in advance for your kind help !
Andy VanDyke
Amsterdam
Netherlands

 

[EBrito]

Hello:

I´m a Windows user, but from your second log
19:10:44.334: Output 'simple_stream': Number of skipped frames due to encoding lag: 6357 (97.0%)
19:10:44.334: Output 'simple_stream': Number of lagged frames due to rendering lag/stalls: 3920 (57.2%)
19:10:44.334: Output 'simple_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 8 (0.1%)


Try rescaling down to 480p
Bitrate 1500 No more needed.
Only 2 cores CPU is very weak. Enconding video requieres a lot of CPU power.

About audio
19:04:04.342: adding 23 milliseconds of audio buffering, total audio buffering is now 812 milliseconds
19:04:04.576: Last log entry repeated for 9 more lines
19:04:04.577: Max audio buffering reached!
19:04:04.577: adding 23 milliseconds of audio buffering, total audio buffering is now 1044 milliseconds

As I said, not an expert on Mac.
You are using 2 webcams : C615 and iSight.
Maybe this is what causes audio isues.
Try with only one connected.

 

[Andy VanDyke]

Hello EBrito,

Thanks for taking the time to look at my issues and for your suggestions. I've just done two more tests and unfortunately changing the settings hasn't helped.

What I did: Change the Video Output Resolution to 768x480
I actually turned off both camera's (as it was a prerecorded video)
I also closed all other programs on my Mac

Since making the changes I've lost audio output..

The first test video I had no audio and the video started to slow down

https://www.facebook.com/andyvandijk/videos/10211574505501139/

The second I also had no audio. Video did not slow down. Before doing the 2nd test I converted the video from mp4 to mkv as I believe that's a better format for streaming. The result was that the video was okay, but the audio was still missing..

https://www.facebook.com/andyvandijk/videos/10211574543222082/

I've attached the log files..
My macbook pro is from 2007 which probabl explains the 2 cores. I've upgraded it much as I can.. Having installed the SSD has already made a huge improvement on the performance. Unfortunately, replacing or adding CPU is not recommended at all for a MacBook pro. So until I have the money to buy a new one I have to try and made this work :)

Do you have any new suggestions :)
Kind regards,
Andy

 

[EBrito]

About audio:

Check audio settings section. In desktop audio, select default. I think you have it disabled.
Your CPU is weak, In fact, the laptop i´m using now has a verya similar one and my attempts to stream with this PB at 480p had very bad results.

So, I think you should try downscaling to 360p and using Bicubic filter (worse image, but less CPU usage).

 

[Andy VanDyke]

Hi EBrito, thanks for your input..

I've attached a Word Document with some text and screenshots to show you what's I've now done. As well as 2 log files. I'm afraid I haven't gotten much further.

I still don't have sound (I explained the microphone in the attached file).. My CPU usages is between 40-45% which is great! But why isn't it working?

+++

Okay. I just tried something different... I've been using the same video to test all the time.. I was thinking, what if there's something with the video - or it's not 'compatible'.. (though when I play it back on my mac, it's perfect). So I added a video which I got using a video screen capture program. - it's very high quality.. And believe it or not, but that video is streaming without any problems. Even at 1280x800 using the bicubic filter. And it's only using 35% CPU....

So what I now need to do is find out what the difference between the two videos is. The first one I recorded using Screenflow.. Perhaps I need to change the setting there..

+++

Thank you very much for your help ! Thanks to all your suggestions you made me look "outside the box" at what the problem could be. I've also learned a lot. So I'm very grateful :)

I'll try and figure out why that first video didn't work and let you know what it is that's wrong. Perhaps someone else can benefit from that information :)

Thanks again !
Andy

 

[EBrito]

You can try Handbrake to convert video to a different / better format
https://handbrake.fr/

By the way, I think you are using OBS Studio 0.15.6. Last MacOS version is 0.16.2
I think you should update it

AUDIO:

You DON´t have DESKTOP AUDIO

Check Audio Settings

 

[Andy VanDyke]

I'm familiar with Handbrake. I absolutely love it :) And indeed it gives great quality !

You're right - I do not have a desktop audio actived. I have my mcbook attached to a large LED screen. There is a built-in audio device there, but I'm not happy with the quality. I can't use my macbook built in audio as it's closed.. I have therefore connected an external source (Logitec camera) to the mic/aux and that works perfectly for both output and input. I tested it also whilst doing a live broadcast and it works great :)

I will update straight away - thank you !!