The process case of a StreamTranscoder could change during the process(depending on the state of the _currentDecoder attribute).

The method is now public.

…tion

…referenceBecause the _transform attribute could be NULL.

Added getCurrentOutputDuration private method.

* Try to process a new frame for each stream (do not exit the method ifa stream failed to process).* Skip the generated streams because they always succeed.

The same log exists in switchToGeneratorDecoder method.

…ator but cannotNo generator will be used for this stream, but the process is notstopped.

* Need to check if duration of all output streams are almost equals tothe expected value. But we cannot ensure to have the exact value for allstreams (it may not be possible depending on the fps/rate of inputstreams).* And the result vary depending on the ffmpeg version.

…h frame