int FileJPEG::can_copy_from(Asset *asset, int64_t position)
{
//printf("FileJPEG::can_copy_from %d %s\n", asset->format, asset->vcodec);
int FileJPEG::can_copy_from(Asset *asset, int64_t position)
{
//printf("FileJPEG::can_copy_from %d %s\n", asset->format, asset->vcodec);