Hi all,
I hope this is the right place for this question. If not i hope you can point 
me to a place where they can help us with further.
We have a question about the high bitdepth support (10/12/14 bitdepth) in 
ffmpeg.To support those formats in AviSynth, we need to know whether the zero 
padding is located in the MSB or in the LSB.If we look at the source code of 
ffmpeg, the zero padding seems to be located in the MSB (see Avisynth+). That's 
correct right?
The followup question is, is this required by the specs (say h.264/h.265 for 
example)? If so where is it described in the specs (i looked at the h.264 
specs, but couldn't find anything about it). If not, how does the 
decoder/renderer know that that the zero padding is located in the MSB?

We were a bit confused, because in the high bitdepth formats described by 
Microsoft (see 
https://msdn.microsoft.com/en-us/library/windows/desktop/bb970578(v=vs.85).aspx),
 the zero padding is located in the LSB. We hope someone can shed us some 
insight into this.
Regards,
Wilbert


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