MPC-HC doesn't provide the proper DAR

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MPC-HC doesn't provide the proper DAR

Post by vramor on Fri Nov 03, 2017 11:13 pm

There is a problem with DAR when MPC-HC is trying to playback the TS where video services are encoded with HEVC and have the resolution 1920x544 @ 50 fps. All the attempts to choose proper renderer ended up without result. Here is the sample of the TS. BTW, DVBViwer plays this TS perfectly using EVR Custom Video Renderer.

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Re: MPC-HC doesn't provide the proper DAR

Post by Admin on Sun Nov 05, 2017 3:36 pm

It is a known problem in FFmpeg. I don't know if and when it will get fixed. I have read that the video might not be fully valid according to HEVC specification.

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Re: MPC-HC doesn't provide the proper DAR

Post by notcyf on Sun Nov 05, 2017 5:33 pm

Admin wrote:It is a known problem in FFmpeg. I don't know if and when it will get fixed. I have read that the video might not be fully valid according to HEVC specification.

There are LOTS of videos which don't follow specs, and while technically you shouldn't bother fixing it, but if you didn't half the HEVC videos on the internet would stop working.

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Re: MPC-HC doesn't provide the proper DAR

Post by vramor on Mon Nov 06, 2017 12:25 am

Admin wrote:It is a known problem in FFmpeg. I don't know if and when it will get fixed. I have read that the video might not be fully valid according to HEVC specification.
If so, why DVBViewer does manage with this video without any problem? Besides, the decoding engine of MPC-HC (LAV) manages with HEVC successfully, because the picture is clear, but it only hasn't got the right aspect ratio.

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Re: MPC-HC doesn't provide the proper DAR

Post by Admin on Mon Nov 06, 2017 2:52 pm

Out-of-spec stuff isn't exactly that common and in most cases it gets handled just fine. This specific issue will also probably get fixed eventually.

This video is interlaced, which means normally two fields of 1920x544 get merged into a 1920x1088 frame. Currently however it gets decoded as progressive giving just 1920x544.

I don't use DVBViewer, but it probably uses a different splitter or decoder.

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Re: MPC-HC doesn't provide the proper DAR

Post by vramor on Mon Nov 06, 2017 3:16 pm

Admin wrote:Out-of-spec stuff isn't exactly that common and in most cases it gets handled just fine. This specific issue will also probably get fixed eventually.

This video is interlaced, which means normally two fields of 1920x544 get merged into a 1920x1088 frame. Currently however it gets decoded as progressive giving just 1920x544.

I don't use DVBViewer, but it probably uses a different splitter or decoder.
Thank you for your attention. Here is the renderer/decoder that DVBViewer uses.

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