[FFmpeg-user] ffmpeg, possible to configure with 8 bit and 10 bit libx264

[Dave Rice]

On Jan 18, 2013, at 11:30 AM, Nicolas George wrote:
> Le nonidi 29 nivôse, an CCXXI, Dave Rice a écrit :
>> I'm working on a project where I need to encode an input to both 8 bit and
>> 10 bit encodings with libx264. I have been able to build ffmpeg with
>> libx264 with either 8 or 10 bit support. Is it possible to build one
>> ffmpeg that would support both? Such as " -c:v libx264 -pix_fmt yuv420p "
>> and " -c:v libx264 -pix_fmt yuv422p10le ". It seems to me that I can build
>> two ffmpegs one with 8 bit x264 and 10 bit x264, but I wanted to check to
>> see if there is a simpler solution.
> 
> If your ffmpeg is linked with libx264 dynamically, then it will adapt
> automatically to the depth supported by the run-time libx264, regardless of
> the version used at build time.
> 
> That means you can select the bit depth by selecting which shared library
> gets loaded. On Unix platforms, that can be done using the LD_LIBRARY_PATH
> environment variable.
> 
> You will not be able to use both bit depths in the same ffmpeg instance,
> though. If you want to encode for both, you need to run ffmpeg twice,
> therefore doing the decoding and filtering twice.

That's a very interesting solution. Thanks much,
Dave