how to fix the x264enc warning

[Andres Gonzalez]

Hi,

Anyone know what is causing this x264enc warning?

       7745 0x7fbf6c004a70 WARN                 x264enc :0::<X264Enc-100>
VBV underflow (frame 135, -439503 bits)

I have tried varies values for the "vbv-buf-capacity" property but nothing
turns off that warning.

Thanks,
-Andres



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[Baby Octopus]

What is the resolution and bitrate? It seems either your bitrate is too low
or the buffer size isn't sufficient

~BO



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[Andres Gonzalez]

The bitrate varies between 1000 and 5000 kbps and most of my test video is
720x480.

When you say "the buffer size isn't sufficient" are you referring
specifically to the vbv buffer?  That is, the specific buffer that the
property "vbv-buf-capacity" sets the size of?

The confusing part was that I tried the full range (0 to 10000) of sizes for
this property and still get this warning.

I don't know the specific function, or purpose of, for this "vbv" buffer so
I am clueless as to what would be a reasonable configuration setting for
"vbv-buf-capacity"   Is it a bit buffer or a frame buffer?  

As a rule of thumb, should it be set to at least the frame rate in
milliseconds?  

-Andres



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