Incorrect scan order indicated in mediainfo

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Incorrect scan order indicated in mediainfo

Post by dani23 on Mon Apr 06, 2015 8:51 pm

Hi there

First I'd like to thank the staff for all the support thus far.

I have an MKV interlaced file that is interlaced with top field first. In mediainfo it displays as bottom field first so when I play with MPC it does not play correctly. Is there a way to correct the info so that all players will know it is top field first?



An independent question: What is the best encoder for h264? If I would like to crop this video and keep it interlaced, so probably output MBAFF interlaced video. Other than that I want the best quality I can get. What would you recommend besides handbrake?

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Re: Incorrect scan order indicated in mediainfo

Post by Admin on Tue Apr 07, 2015 12:41 am

LAV Video decoder has an option to override the scan order. That should allow you to play the file correctly. Don't forget to reset the option afterwards, otherwise other file may play incorrectly.

The best encoder is x264. Handbrake uses that. To improve quality just lower the CRF value in encoding settings.

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Re: Incorrect scan order indicated in mediainfo

Post by dani23 on Tue Apr 07, 2015 3:12 am

Yes I am aware of being able to override the scan order. Is there no way I can change some kind of attribute in the original video file so that mediainfo will display the correct scan order so all devices will playback correctly with automatic denterlacing?

What is the best alternative to handbrake? I seem to get issues when trying to output MBAFF interlaced h264 video.

Thanks again

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Re: Incorrect scan order indicated in mediainfo

Post by Admin on Tue Apr 07, 2015 9:01 am

Scan order is not something that you can (easily) change. It is part of the video data, so you need to re-encode it.

Avidemux is another good free converter. If you haven't got a good reason to keep the video interlaced, then I would recommend deinterlacing it. Interlaced video is just evil.

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Re: Incorrect scan order indicated in mediainfo

Post by dani23 on Tue Apr 07, 2015 9:58 am

Oh okay I understand. The reason I want to keep it interlaced is because when I deinterlace the video then it is not as smooth as it was when it was interlaced. So I'd rather keep it interlaced and let it deinterlace on playback.

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Re: Incorrect scan order indicated in mediainfo

Post by Admin on Wed Apr 08, 2015 12:49 am

With double framerate deinterlacing (25i -> 50p) it should theoretically be just as smooth.

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Re: Incorrect scan order indicated in mediainfo

Post by dani23 on Wed Apr 08, 2015 5:50 am

Does the double frame rate preserve the information stored in both fields?

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Re: Incorrect scan order indicated in mediainfo

Post by Admin on Wed Apr 08, 2015 6:28 am

Yes. It will create one frame for each field (using data from two fields).

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Re: Incorrect scan order indicated in mediainfo

Post by dani23 on Wed Apr 08, 2015 6:37 am

Okay thanks I never thought of that. Thanks!

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Re: Incorrect scan order indicated in mediainfo

Post by dani23 on Fri Apr 10, 2015 3:16 am

Hi just a quick question on interlaced encoding:

I have 25i top field first video.

If I use x264 and encode interlaced using MBAFF would I still have to double the framerate to maintain temporal and spatial resolution?

So would MBAFF 25i be equivalent to the original video in terms of temporal and spatial resolution?

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Re: Incorrect scan order indicated in mediainfo

Post by Admin on Sat Apr 11, 2015 12:49 am

So would MBAFF 25i be equivalent to the original video in terms of temporal and spatial resolution?
Yes

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