reverting warning commit

Author: bjuncek

torchvision/io/_video_opt.py

@@ -1,4 +1,3 @@
-
 import importlib
 import math
 import os
@@ -17,7 +16,7 @@
 
     loader_details = (
         importlib.machinery.ExtensionFileLoader,
-        importlib.machinery.EXTENSION_SUFFIXES
+        importlib.machinery.EXTENSION_SUFFIXES,
     )
 
     extfinder = importlib.machinery.FileFinder(lib_dir, loader_details)
@@ -26,9 +25,7 @@
         torch.ops.load_library(ext_specs.origin)
         _HAS_VIDEO_OPT = True
 except (ImportError, OSError):
-    warnings.warn("Could not import video_reader bakcend."
-                  + " Make sure ffmpeg is installed properly"
-                  + " and rebuild torchvision.")
+    pass
 
 
 default_timebase = Fraction(0, 1)
@@ -243,10 +240,18 @@ def _read_video_from_file(
         audio_timebase.numerator,
         audio_timebase.denominator,
     )
-    vframes, _vframe_pts, vtimebase, vfps, vduration, \
-        aframes, aframe_pts, atimebase, asample_rate, aduration = (
-            result
-        )
+    (
+        vframes,
+        _vframe_pts,
+        vtimebase,
+        vfps,
+        vduration,
+        aframes,
+        aframe_pts,
+        atimebase,
+        asample_rate,
+        aduration,
+    ) = result
     info = _fill_info(vtimebase, vfps, vduration, atimebase, asample_rate, aduration)
     if aframes.numel() > 0:
         # when audio stream is found
@@ -281,8 +286,18 @@ def _read_video_timestamps_from_file(filename):
         0,  # audio_timebase_num
         1,  # audio_timebase_den
     )
-    _vframes, vframe_pts, vtimebase, vfps, vduration, \
-        _aframes, aframe_pts, atimebase, asample_rate, aduration = (result)
+    (
+        _vframes,
+        vframe_pts,
+        vtimebase,
+        vfps,
+        vduration,
+        _aframes,
+        aframe_pts,
+        atimebase,
+        asample_rate,
+        aduration,
+    ) = result
     info = _fill_info(vtimebase, vfps, vduration, atimebase, asample_rate, aduration)
 
     vframe_pts = vframe_pts.numpy().tolist()
@@ -406,10 +421,18 @@ def _read_video_from_memory(
         audio_timebase_denominator,
     )
 
-    vframes, _vframe_pts, vtimebase, vfps, vduration, \
-        aframes, aframe_pts, atimebase, asample_rate, aduration = (
-            result
-        )
+    (
+        vframes,
+        _vframe_pts,
+        vtimebase,
+        vfps,
+        vduration,
+        aframes,
+        aframe_pts,
+        atimebase,
+        asample_rate,
+        aduration,
+    ) = result
 
     if aframes.numel() > 0:
         # when audio stream is found
@@ -447,10 +470,18 @@ def _read_video_timestamps_from_memory(video_data):
         0,  # audio_timebase_num
         1,  # audio_timebase_den
     )
-    _vframes, vframe_pts, vtimebase, vfps, vduration, \
-        _aframes, aframe_pts, atimebase, asample_rate, aduration = (
-            result
-        )
+    (
+        _vframes,
+        vframe_pts,
+        vtimebase,
+        vfps,
+        vduration,
+        _aframes,
+        aframe_pts,
+        atimebase,
+        asample_rate,
+        aduration,
+    ) = result
     info = _fill_info(vtimebase, vfps, vduration, atimebase, asample_rate, aduration)
 
     vframe_pts = vframe_pts.numpy().tolist()