Properly launder EOF exception (#520)

Author: scotts

src/torchcodec/decoders/_core/VideoDecoderOps.cpp

@@ -240,7 +240,12 @@ OpsFrameOutput get_next_frame(at::Tensor& decoder) {
 
 OpsFrameOutput get_frame_at_pts(at::Tensor& decoder, double seconds) {
   auto videoDecoder = unwrapTensorToGetDecoder(decoder);
-  auto result = videoDecoder->getFramePlayedAt(seconds);
+  VideoDecoder::FrameOutput result;
+  try {
+    result = videoDecoder->getFramePlayedAt(seconds);
+  } catch (const VideoDecoder::EndOfFileException& e) {
+    C10_THROW_ERROR(IndexError, e.what());
+  }
   return makeOpsFrameOutput(result);
 }
 

test/decoders/test_video_decoder_ops.py

@@ -308,13 +308,17 @@ def test_get_frames_in_range(self, device):
     def test_throws_exception_at_eof(self, device):
         decoder = create_from_file(str(NASA_VIDEO.path))
         add_video_stream(decoder, device=device)
+
         seek_to_pts(decoder, 12.979633)
         last_frame, _, _ = get_next_frame(decoder)
         reference_last_frame = NASA_VIDEO.get_frame_data_by_index(289)
         assert_frames_equal(last_frame, reference_last_frame.to(device))
         with pytest.raises(IndexError, match="no more frames"):
             get_next_frame(decoder)
 
+        with pytest.raises(IndexError, match="no more frames"):
+            get_frame_at_pts(decoder, seconds=1000.0)
+
     @pytest.mark.parametrize("device", cpu_and_cuda())
     def test_throws_exception_if_seek_too_far(self, device):
         decoder = create_from_file(str(NASA_VIDEO.path))