Workaround for av context closing issue when using AUTO thread_type (#…

…8555)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Improved video processing stability by disabling threading in video
reading classes, addressing potential memory management issues.

- **New Features**
- Enhanced video handling capabilities with updated threading parameters
for better performance during video processing.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

changelog.d/20241017_155815_andrey_fix_task_creating.md

@@ -0,0 +1,4 @@
+### Fixed
+
+- av context closing issue when using AUTO thread_type
+  (<https://github.com/cvat-ai/cvat/pull/8555>)

cvat/apps/engine/media_extractors.py

@@ -552,6 +552,8 @@ def read_av_container(self, source: Union[str, io.BytesIO]) -> av.container.Inpu
             for stream in container.streams:
                 context = stream.codec_context
                 if context and context.is_open:
+                    # Currently, context closing may get stuck on some videos for an unknown reason,
+                    # so the thread_type == 'AUTO' setting is disabled for future investigation
                     context.close()
 
             if container.open_files:
@@ -583,7 +585,7 @@ def __init__(
         stop: Optional[int] = None,
         dimension: DimensionType = DimensionType.DIM_2D,
         *,
-        allow_threading: bool = True,
+        allow_threading: bool = False,
     ):
         super().__init__(
             source_path=source_path,
@@ -635,6 +637,8 @@ def iterate_frames(
 
                 if self.allow_threading:
                     video_stream.thread_type = 'AUTO'
+                else:
+                    video_stream.thread_type = 'NONE'
 
             frame_counter = itertools.count()
             with closing(self._decode_stream(container, video_stream)) as stream_decoder:
@@ -795,6 +799,8 @@ def iterate_frames(self, *, frame_filter: Iterable[int]) -> Iterable[av.VideoFra
             video_stream = container.streams.video[0]
             if self.allow_threading:
                 video_stream.thread_type = 'AUTO'
+            else:
+                video_stream.thread_type = 'NONE'
 
             container.seek(offset=start_decode_timestamp, stream=video_stream)