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New RTMP Video Bitrate Settings

Hello all. I’m a bit ignorant of all the details on the “back end” of streaming, so forgive these noob questions, but I want to make sure I understand these new bitrate settings before I stream on Saturday evening.

Two quick questions:

1. Do these settings come into play with YouTube Live streaming, or with streaming to other servers? Or both?

2. Can you change the bitrate settings on the fly while streaming, or should I stop the stream, change settings, and then restart?

In the “Stream Health” box, YouTube keeps telling me that the bitrate is too high, seemingly regardless of where I have the menu settings. Is there a downside to this? Will there be stream stability issues if the bitrate is WAY too high?

A couple of examples follow:

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  • Here are some messages I got when I was set at a Fixed bitrate of 1200:

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  • And here are some messages when I was using Automatic, with a Maximum Bitrate of 4000:

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  • I forgot to add that earlier in the testing yesterday, YouTube gave me a flag about the stream frame rate being too high, and that I should back it down to 30 fps. Is there a relationship between the selected bitrate and the frame rate (other than knowing that a higher frame rate requires more data/second to get pushed up the pipe)? I don't think I have a way to manipulate frame rate directly.

    Just trying to understand why YT thinks I'm hitting it with so much data when I appear to be trying to limit it at the app. Thx.

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  • Eric T It's not clear what your testing.
    If you test using the YouTube API we've implemented you'd select a preset which are YouTube approved.

    If you're using one of these presets please do post that information.
    If you're using Generic RTMP those presets may have some issues with YouTube.

     
     

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  • Eric T said:
    2. Can you change the bitrate settings on the fly while streaming, or should I stop the stream, change settings, and then restart?

     Never changes settings once you've started streaming.

    Eric T said:
    In the “Stream Health” box, YouTube keeps telling me that the bitrate is too high, seemingly regardless of where I have the menu settings. Is there a downside to this? Will there be stream stability issues if the bitrate is WAY too high?

     Bit rate can fluctuate from the target depending on source but should go that far above the target. There can be momentary spikes on fast motion sources or "complex" transitions like a dissolve. Whether that's a problem depends both on your bandwidth available to you by your ISP and how YouTube's servers handles the spikes.

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  • CraigS Craig, I’m just streaming with the Wirecast Go mobile app. I don’t have any options that look like what you have pasted here (I assume that’s from one of your desktop products).

    All I do is pick the YouTube Live event that I want to stream to. There is no complex content - just me in front of the phone’s camera.

    I’m just asking about the new bitrate options (from this week’s update), and trying to understand why they don’t seem to influence the “high bitrate” flags I’m getting from YouTube. (And whether those messages mean I should be messing with the bitrates in the first place.)

    Thx!

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  • Eric T said:
    Craig, I’m just streaming with the Wirecast Go mobile app.

     Sorry about that. Yes those are desktop only options. 

    Do you mean these?
    Automatic, Fixed. the data rate selection options?

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  • CraigS Yep, those are the new options that appeared with this week's update. Thx!

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  • CraigS so… about that bitrate fluctuation: https://youtu.be/--KOHSvHY1o this was something I did last weekend and had used the 6000k 1080p preset built into Wirecast.

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  • Eric T 

     

    When streaming what is Wirecast Go reporting in the upper right.
    I used Fixed 200kbps for the first one and you can see it's close to that. 
    The line underneath is green. So all is good.

    On the one after that I used Fixed 12000kbps, It reports 7.4MB (7400kbps).
    The line underneath is yellow which indicates connection issues. In this case the reported data rate below the targeted data rate may be due to the simple image or may be due to the connection issues.

    Can you correlate the YouTube Control Room report with what Wirecast Go is reporting (data rate vs targeted data rate) and connection indicate (green, yellow, red)?

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  • Understood, Craig. Will gather that correlated data and report back. (By "Control Room report", do you mean the Stream Health messages as I posted above?)  Thx.

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  • Eric T 

    Eric T said:
    (By "Control Room report", do you mean the Stream Health messages as I posted above?)

    I see that info from the YouTube Live Control Room (Creator Studio). 

     

    Eric T said:
    Will gather that correlated data and report back

     Thanks. I want to make sure what's reported in Wirecast Go matches the YouTube Stream Health messages.

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