Disable ffprobe test internally

Summary:
Tests related to `custom_frame_mappings` that utilize ffprobe should be skipped internally as ffprobe is not available. 

In addition to adding the `pytest.skip` decorator to these tests, I removed `custom_frame_mapping` generation from `pytest.mark.parametrize` in `test_custom_frame_mappings_init_fails` to allow tests to run.

Reviewed By: scotts

Differential Revision: D82378431

Author: Dan-Flores

test/test_decoders.py

@@ -1292,6 +1292,10 @@ def setup_frame_mappings(tmp_path, file, stream_index):
             # Return the custom frame mappings as a JSON string
             return custom_frame_mappings
 
+    @pytest.mark.skipif(
+        in_fbcode(),
+        reason="ffprobe not available internally",
+    )
     @pytest.mark.parametrize("device", all_supported_devices())
     @pytest.mark.parametrize("stream_index", [0, 3])
     @pytest.mark.parametrize(
@@ -1338,12 +1342,16 @@ def test_custom_frame_mappings_json_and_bytes(
             ),
         )
 
+    @pytest.mark.skipif(
+        in_fbcode(),
+        reason="ffprobe not available internally",
+    )
     @pytest.mark.parametrize("device", all_supported_devices())
     @pytest.mark.parametrize(
         "custom_frame_mappings,expected_match",
         [
             pytest.param(
-                NASA_VIDEO.generate_custom_frame_mappings(0),
+                None,
                 "seek_mode",
                 id="valid_content_approximate",
             ),
@@ -1361,6 +1369,8 @@ def test_custom_frame_mappings_json_and_bytes(
     def test_custom_frame_mappings_init_fails(
         self, device, custom_frame_mappings, expected_match
     ):
+        if custom_frame_mappings == None:
+            custom_frame_mappings = NASA_VIDEO.generate_custom_frame_mappings(0)
         with pytest.raises(ValueError, match=expected_match):
             VideoDecoder(
                 NASA_VIDEO.path,

test/test_ops.py

@@ -9,6 +9,8 @@
 import os
 from functools import partial
 
+from pytorch.torchcodec.test.utils import in_fbcode
+
 os.environ["TORCH_LOGS"] = "output_code"
 import json
 import subprocess
@@ -480,6 +482,10 @@ def test_frame_pts_equality(self):
             )
             assert pts_is_equal
 
+    @pytest.mark.skipif(
+        in_fbcode(),
+        reason="ffprobe not available internally",
+    )
     def test_seek_mode_custom_frame_mappings_fails(self):
         decoder = create_from_file(
             str(NASA_VIDEO.path), seek_mode="custom_frame_mappings"