MPEG2 with AR change doesn't display or cut properly

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wavelet
Posts: 31
Joined: Fri Nov 19, 2010 10:42 am

MPEG2 with AR change doesn't display or cut properly

Post by wavelet »

First of all, thanks for the fixes in v1.8.5 (although I miss the jog-wheel which has disappeared). :(

I've found a new issue which affects MPEG2 streams in which the Display Aspect Ratio changes in the stream. This is common in UK DVB-S transmissions where the program might have a DAR of 4:3 but the commercial breaks have a DAR of 16:9.

In the 'wavelet' directory on your FTP server I have uploaded a sample file: AR_change_sample.ts.

At the point at which the DAR changes (frame 408 at 16.32s in the sample) SmartCutter displays green blocks in the edit window. If an attempt is made to cut the video around these points, there are green blocks in the resulting video.

I haven't analyzed the MPEG2 video stream in detail but I assume there must be a sequence_end code and then a new sequence_header with updated aspect_ratio_information at the GOP boundary.

wavelet
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