FrameAllocator::Frame audio_frame = audio_frame_allocator->alloc_frame();
if (audio_frame.data != nullptr) {
const unsigned num_stereo_samples = audio_sample_frequency / fps;
FrameAllocator::Frame audio_frame = audio_frame_allocator->alloc_frame();
if (audio_frame.data != nullptr) {
const unsigned num_stereo_samples = audio_sample_frequency / fps;