u32 gf_isom_get_constant_sample_size(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak || !trak->Media || !trak->Media->information || !trak->Media->information->sampleTable || !trak->Media->information->sampleTable->SampleSize) return 0;
	return trak->Media->information->sampleTable->SampleSize->sampleSize;
}
u32 gf_isom_get_constant_sample_size(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak || !trak->Media || !trak->Media->information || !trak->Media->information->sampleTable || !trak->Media->information->sampleTable->SampleSize) return 0;
	return trak->Media->information->sampleTable->SampleSize->sampleSize;
}