Move "scanned" metadata as video-only and add begin_stream_from_header
#591
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facebook-github-bot
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NicolasHug
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begin_stream_from_header
NicolasHug
commented
Mar 24, 2025
| from torchcodec.decoders._decoder_utils import ( | ||
| create_decoder, | ||
| get_and_validate_stream_metadata, | ||
| ERROR_REPORTING_INSTRUCTIONS, |
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Changes below: we previously had a common util for audio and video that extracted and validated the metadata: get_and_validate_stream_metadata(). Since we moved a bunch of fields as video-only, this util wasn't generic enough anymore to justify its existence, hence a few edits here and in the video_decoder.py file.
scotts
reviewed
Mar 24, 2025
| if (streamMetadata.beginStreamFromHeader.has_value()) { | ||
| map["beginStreamFromHeader"] = | ||
| std::to_string(*streamMetadata.beginStreamFromHeader); | ||
| } |
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This reminded me to create Issue #593.
scotts
approved these changes
Mar 24, 2025
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This PR does a bunch of related things:
begin_stream_seconds_from_headerfield to audio and video metadata. It is derived from the AVStream'sstart_timefield. This field is useful e.g. in our tutorial example because it is now clear that the stream doesn't exactly starts at 0.begin_stream_seconds_from_contentandend_stream_seconds_from_contentfields as video-only: these fields are derived from a scan, so there's no point having them for audio.duration_secondsmetadata as video-only, because it is derived frombegin_stream_seconds_from_contentandend_stream_seconds_from_content. This means that audio metadata now only containsduration_seconds_from_header.start_secondsin the call toget_samples_played_in_range: the input check was based onbegin_stream_seconds_from_contentso that didn't make much sense. We still have tests that make sure we provide good error messages in the incorrect cases.