feature/add-video-trimming-via-transcription-ranges-to-session (#221)

* Add transcription range fields to database and ingestion models, add validator for time duration, add range filter to ffmpeg audio split, update tests

* Add tests for edge case transcription ranges

* Fix end_time=start_time typo, update tests to be more concise, add ffmpeg error logging

* Updated transcription range to video range, updated video handling to host when limiting video to a range, updated mp4 conversion to allow a range, connected mp4 to clip functionality, updated tests and tried to make testing slightly more consistent, added Session ingestion verification to test out

* Update session hash to reflect trimmed video

* Bypass hash task

* Remove unnecessary logging, duration validation comments, elif typo fix in cdp_will_host control structure

* Reverted function parameter doc for split audio

* Improved documentation for video_start_time in ingestion_models

cdp_backend/database/models.py

@@ -494,6 +494,8 @@ class Session(Model):
     session_index = fields.NumberField(required=True)
     session_content_hash = fields.TextField(required=True)
     video_uri = fields.TextField(required=True, validator=validators.resource_exists)
+    video_start_time = fields.TextField(validators.time_duration_is_valid)
+    video_end_time = fields.TextField(validators.time_duration_is_valid)
     caption_uri = fields.TextField(validator=validators.resource_exists)
     external_source_id = fields.TextField()
 
@@ -515,6 +517,8 @@ def Example(cls) -> Model:
         session.video_uri = (
             "https://video.seattle.gov/media/council/brief_072219_2011957V.mp4"
         )
+        session.video_start_time = "01:00:00"
+        session.video_end_time = "99:59:59"
         session.session_content_hash = (
             "05bd857af7f70bf51b6aac1144046973bf3325c9101a554bc27dc9607dbbd8f5"
         )

cdp_backend/database/validators.py

@@ -72,6 +72,34 @@ def router_string_is_valid(router_string: Optional[str]) -> bool:
     return False
 
 
+def time_duration_is_valid(time_duration: Optional[str]) -> bool:
+    """
+    Validate that the provided time duration string is acceptable to FFmpeg.
+    The validator is unnecessarily limited to HH:MM:SS. The spec is a little
+    more flexible.
+
+    None is a valid option.
+
+    Parameters
+    ----------
+    time_duration: Optional[str]
+        The time duration to validate.
+
+    Returns
+    -------
+    status: bool
+        The validation status.
+    """
+    if time_duration is None:
+        return True
+
+    # HH:MM:SS
+    if re.match(r"^((((\d{1,2}:)?[0-5])?\d:)?[0-5])?\d$", time_duration):
+        return True
+
+    return False
+
+
 def email_is_valid(email: Optional[str]) -> bool:
     """
     Validate that a valid email was provided.

cdp_backend/pipeline/event_gather_pipeline.py

@@ -130,18 +130,13 @@ def create_event_gather_flow(
                 # Download video to local copy
                 resource_copy_filepath = resource_copy_task(uri=session.video_uri)
 
-                # Get unique session identifier
-                session_content_hash = get_session_content_hash(
-                    tmp_video_filepath=resource_copy_filepath,
-                )
-
                 # Handle video conversion or non-secure resource
                 # hosting
                 (
                     tmp_video_filepath,
                     session_video_hosted_url,
+                    session_content_hash,
                 ) = convert_video_and_handle_host(
-                    session_content_hash=session_content_hash,
                     video_filepath=resource_copy_filepath,
                     session=session,
                     credentials_file=config.google_credentials_file,
@@ -293,14 +288,13 @@ def get_session_content_hash(
     return file_utils.hash_file_contents(uri=tmp_video_filepath)
 
 
-@task(nout=2)
+@task(nout=3)
 def convert_video_and_handle_host(
-    session_content_hash: str,
     video_filepath: str,
     session: Session,
     credentials_file: str,
     bucket: str,
-) -> Tuple[str, str]:
+) -> Tuple[str, str, str]:
     """
     Convert a video to MP4 (if necessary), upload it to the file store, and remove
     the original non-MP4 file that was resource copied.
@@ -330,19 +324,41 @@ def convert_video_and_handle_host(
     # Get file extension
     ext = Path(video_filepath).suffix.lower()
 
+    trim_video = bool(session.video_start_time or session.video_end_time)
+
     # Convert to mp4 if file isn't of approved web format
     cdp_will_host = False
     if ext not in [".mp4", ".webm"]:
         cdp_will_host = True
 
         # Convert video to mp4
-        mp4_filepath = file_utils.convert_video_to_mp4(video_filepath)
+        mp4_filepath = file_utils.convert_video_to_mp4(
+            video_filepath=Path(video_filepath),
+            start_time=session.video_start_time,
+            end_time=session.video_end_time,
+        )
 
-        # Remove old mkv file
         fs_functions.remove_local_file(video_filepath)
 
         # Update variable name for easier downstream typing
-        video_filepath = mp4_filepath
+        video_filepath = str(mp4_filepath)
+
+    # host trimmed videos because it's simpler than setting
+    # up transcription and playback ranges
+    elif trim_video:
+        cdp_will_host = True
+
+        # Trim video
+        trimmed_filepath = file_utils.clip_and_reformat_video(
+            video_filepath=Path(video_filepath),
+            start_time=session.video_start_time,
+            end_time=session.video_end_time,
+        )
+
+        fs_functions.remove_local_file(video_filepath)
+
+        # Update variable name for easier downstream typing
+        video_filepath = str(trimmed_filepath)
 
     # Check if original session video uri is a m3u8
     # We cant follow the normal coonvert video process from above
@@ -370,6 +386,9 @@ def convert_video_and_handle_host(
     else:
         hosted_video_media_url = session.video_uri
 
+    # Get unique session identifier
+    session_content_hash = file_utils.hash_file_contents(uri=video_filepath)
+
     # Upload and swap if cdp is hosting
     if cdp_will_host:
         # Upload to gcsfs
@@ -387,7 +406,7 @@ def convert_video_and_handle_host(
             uri=hosted_video_uri,
         )
 
-    return video_filepath, hosted_video_media_url
+    return video_filepath, hosted_video_media_url, session_content_hash
 
 
 @task

cdp_backend/pipeline/ingestion_models.py

@@ -134,14 +134,39 @@ class Session(IngestionModel, DataClassJsonMixin):
     """
     A session is a working period for an event.
     For example, an event could have a morning and afternoon session.
+
+    Notes
+    -----
+    video_start_time is a duration relative to the beginning of the video in
+    HH:MM:SS format. It does not affect nor is relative to session_datetime
+    or any other datetime. If the portion of the video relavent to the session
+    begins 37m50s into the full video, video_start_time will be "37:50".
+    An absent start time is equivalent to the beginning of the video, and an
+    absent end time is equivalent to the end of the video, so either can be omitted.
     """
 
     session_datetime: datetime
     video_uri: str
     session_index: int
+    video_start_time: Optional[str] = None
+    video_end_time: Optional[str] = None
     caption_uri: Optional[str] = None
     external_source_id: Optional[str] = None
 
+    def __post_init__(self) -> None:
+        # validate start/end time pair during ingestion
+        if self.video_start_time and self.video_end_time:
+            # fill in potentially missing hh:mm:s
+            # for flexible input format [h[h:[m[m:[s]]]]]s
+            start = list(map(int, ("00:00:0" + self.video_start_time).split(":")))
+            end = list(map(int, ("00:00:0" + self.video_end_time).split(":")))
+            start.reverse()
+            end.reverse()
+            start_seconds = start[0] + start[1] * 60 + start[2] * 3600
+            end_seconds = end[0] + end[1] * 60 + end[2] * 3600
+            if start_seconds >= end_seconds:
+                raise ValueError("start_time must be less than end_time if both exist")
+
 
 @dataclass
 class Body(IngestionModel, DataClassJsonMixin):
@@ -263,6 +288,8 @@ class EventIngestionModel(IngestionModel, DataClassJsonMixin):
             video_uri=(
                 "https://video.seattle.gov/media/council/council_113020_2022091V.mp4"
             ),
+            video_start_time=("00:00:00"),
+            video_end_time=("99:59:59"),
             caption_uri=(
                 "https://www.seattlechannel.org/documents/seattlechannel/closedcaption/2020/council_113020_2022091.vtt"  # noqa: E501
             ),

cdp_backend/pipeline/mock_get_events.py

@@ -54,20 +54,33 @@
     (
         "https://video.seattle.gov/media/council/council_010421_2022101V.mp4",
         "https://www.seattlechannel.org/documents/seattlechannel/closedcaption/2021/council_010421_2022101.vtt",  # noqa
+        None,
+        None,
     ),
     (
         "https://video.seattle.gov/media/council/council_113020_2022091V.mp4",
         "https://www.seattlechannel.org/documents/seattlechannel/closedcaption/2020/council_113020_2022091.vtt",  # noqa
+        "1",
+        "25:25",
     ),
     (
         "https://video.seattle.gov/media/council/council_112320_2022089V.mp4",
         "https://www.seattlechannel.org/documents/seattlechannel/closedcaption/2020/brief_112320_2012089.vtt",  # noqa
+        None,
+        "2:58:14",
     ),
     (
         "https://video.seattle.gov/media/council/council_110920_2022085V.mp4",
         "https://www.seattlechannel.org/documents/seattlechannel/closedcaption/2020/council_110920_2022085.vtt",  # noqa
+        "1",
+        None,
+    ),
+    (
+        "https://video.seattle.gov/media/council/council_101220_2022077V.mp4",
+        None,
+        None,
+        None,
     ),
-    ("https://video.seattle.gov/media/council/council_101220_2022077V.mp4", None),
 ]
 
 
@@ -121,6 +134,8 @@ def _get_example_event() -> EventIngestionModel:
             session_datetime=datetime.utcnow() + (i * timedelta(hours=3)),
             session_index=i,
             video_uri=session[0],
+            video_start_time=session[2],
+            video_end_time=session[3],
             caption_uri=session[1],
         )
         for i, session in enumerate(random.sample(SESSIONS, random.randint(1, 3)))

cdp_backend/tests/database/test_validators.py

@@ -48,6 +48,39 @@ def test_router_string_is_valid(router_string: str, expected_result: bool) -> No
     assert actual_result == expected_result
 
 
+@pytest.mark.parametrize(
+    "time_duration, expected_result",
+    [
+        (None, True),
+        ("1", True),
+        ("11", True),
+        ("1:11", True),
+        ("11:11", True),
+        ("1:11:11", True),
+        ("99:59:59", True),
+        ("0", True),
+        ("00", True),
+        ("0:00", True),
+        ("00:00", True),
+        ("0:00:00", True),
+        ("00:00:00", True),
+        ("111", False),
+        ("11:1", False),
+        ("111:11", False),
+        ("11:1:11", False),
+        ("11:11:1", False),
+        ("111:11:11", False),
+        ("60", False),
+        ("60:00", False),
+        ("1:60:00", False),
+        ("1:00:60", False),
+    ],
+)
+def test_time_duration_is_valid(time_duration: str, expected_result: bool) -> None:
+    actual_result = validators.time_duration_is_valid(time_duration)
+    assert actual_result == expected_result
+
+
 @pytest.mark.parametrize(
     "email, expected_result",
     [

cdp_backend/tests/pipeline/test_event_gather_pipeline.py

@@ -580,6 +580,7 @@ def test_store_event_processing_results(
 @mock.patch(f"{PIPELINE_PATH}.fs_functions.upload_file")
 @mock.patch(f"{PIPELINE_PATH}.fs_functions.get_open_url_for_gcs_file")
 @mock.patch(f"{PIPELINE_PATH}.fs_functions.remove_local_file")
+@mock.patch(f"{PIPELINE_PATH}.file_utils.hash_file_contents")
 @mock.patch(f"{PIPELINE_PATH}.file_utils.convert_video_to_mp4")
 @pytest.mark.parametrize(
     "video_filepath, session, expected_filepath, expected_hosted_video_url",
@@ -618,6 +619,7 @@ def test_store_event_processing_results(
 )
 def test_convert_video_and_handle_host(
     mock_convert_video_to_mp4: MagicMock,
+    mock_hash_file_contents: MagicMock,
     mock_remove_local_file: MagicMock,
     mock_generate_url: MagicMock,
     mock_upload_file: MagicMock,
@@ -629,12 +631,13 @@ def test_convert_video_and_handle_host(
     mock_upload_file.return_value = "file_store_uri"
     mock_generate_url.return_value = "hosted-video.mp4"
     mock_convert_video_to_mp4.return_value = expected_filepath
+    mock_hash_file_contents.return_value = "abc123"
 
     (
         mp4_filepath,
         session_video_hosted_url,
+        session_content_hash,
     ) = pipeline.convert_video_and_handle_host.run(
-        session_content_hash="abc123",
         video_filepath=video_filepath,
         session=session,
         credentials_file="fake/credentials.json",