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bavc / qctools

QCTools (Quality Control Tools for Video Preservation) is a free and open source software tool that helps users analyze and understand their digitized video files through use of audiovisual analytics and filtering. QCTools is funded by the National Endowment for the Humanities and the Knight Foundation, and is developed by the Bay Area Video Coalition.
http://www.bavc.org/qctools
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Frame Navigator Thumbnails doesn't correspond with Video Analysis Window #458

Open joshuatj opened 6 years ago

joshuatj commented 6 years ago

We wanted to use QCTools to find out why we can't seem to transcode a video file with h.264 wrapped in MOV. For some reason the frame thumbnails at the Frame Navigator (bottom) doesn't seem to correspond to the frame in Video Analysis Window. frame navigator redacted

video analysis window redacted

Here's the Mediainfo export. source mediainfo export.txt

joshuatj commented 6 years ago

QCTools export source qctools export.zip

kieranjol commented 6 years ago

I've never seen this in a file before:

Frame rate                               : 23.976 (24000/1001) FPS
Original frame rate                      : 25.000 FPS

Looks like your container is saying 23.976, stream is saying 25fps? Not sure if that's causing the issue though.

JeromeMartinez commented 6 years ago

Looks like your container is saying 23.976, stream is saying 25fps?

Classic when one plays too much with metadata... and reason difference is displayed in MediaInfo ;-) But no, it is not the source of the issue, the stream frame rate being discarded by the demuxer. Issue may be due to B-frames reordering issue, but without (a part of) the file file it is difficult to debug.