Figure out gpac flags for decoding frames

[maureendaum]

From #1 :

One more question about the build: the compiler complains about these lines, saying it can't convert flags to type GF_ISONaluExtractMode. I am not familiar with the gpac library, but it seems it is because the resulting bit-wise oring is not a "valid enum" value based on the source code for GF_ISONaluExtractMode. Based on this, is it sufficient to just pass the GF_ISOM_NALU_EXTRACT_ANNEXB_FLAG flag since if I am understanding it correctly, it will also apply the GF_ISOM_NALU_EXTRACT_INBAND_PS_FLAG flag? Passing just the GF_ISOM_NALU_EXTRACT_ANNEXB_FLAG flag gets me through the whole build, and I will test some runs next.

However, I don't see that issue, and when I remove GF_ISOM_NALU_EXTRACT_INBAND_PS_FLAG the decoder fails to output any frames after a selection.

[maureendaum]

None of the single flags available in GPAC 1.0.1 seem to work; the decoder fails to output any frames after a selection.
Using the combination of flags in GPAC 0.7.1 does work.