[FFmpeg-user] IMX50 NTSC framesize differs to the SMPTE 356M-2001 Standard - why?

[tim nicholson]

On 08/06/15 15:19, Christoph Gerstbauer wrote:
> 
> 
> [..]
> Hello Michael, hello Tim!
> 
> I have still a little problem with IMX40 with NTSC:
> 
> I need to set the paketsize (framesize) at IMX40 NTSC to 166833bits.
> For that I need a bitrate of: 39999920
> 
> FFmpeg fails because this bitrate is not allowed for IMX40. For IMX50
> the bitrate "49999840" is allowed.

This is to allow for the max coded frame size limit for NTSC to be met.
For IMX40 one is already well below that limit so that 40M bit rate is
all that is allowed.

What is the use case for this  'slimmed down' IMX40 bit rate/framesize,
I see nothing in S356m or S356m requiring this.


> Is it possible to implement this bitrate (39999920) to the allowed
> bitrate values at the IMX40 NTSC encoding?
> 
> Command Line output:
> 
>  [...]


-- 
Tim.
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