Viewing HD and 4K video - strange lines appearing.

hatfieldphoto wrote on 9/9/2016, 5:43 AM

Hi  - my first posting on the Magix forum - please forgive me as I am not much of a techie. I've been experimenting with converting my HD and 4K projects direct to mpeg4 or MKV files for viewing via a USB stick direct to my TV rather than my more traditional practice of burning a blu ray disc. I should say my TV is an older plasma set and is only "HD Ready" ie 1280 x 720 pixels.

I was quite pleased with the results however I did notice some very brief horizontal lines that appear on the image during moments of fast action or rapid pans - this from HD rather than 4k which I haven't tried yet.

They appear almost like scanning lines for a fraction of a second. At first I thought it was my imagination however I burned aBlu Ray disc from the same project and there are definitely no signs of these lines. I wonder if anyone can tell me what they are and how they can be eliminated as the idea of playing direct from flash memory or an external harddrive is an appealing one. Many thanks.

Comments

pmikep wrote on 9/9/2016, 4:02 PM

I don't have a direct answer for you. Some thoughts:

When I set max bit rate too low for encode, I get blocks during fast motion. You said you got scan lines. Still, you could try encoding at a higher bit rate. (There is also a user setable buffer size in one of the mp4 encoders that affects this.)

Do you get lines on every device, or only TV? (Example, when you play on computer with VLAN or some other freeware player?) If only on the TV, it could be one of those smoothing features that some HDTV's offer. Or perhaps a limitation in old Plasma TV's? (Have LED here.)

Last changed by pmikep on 9/9/2016, 4:02 PM, changed a total of 1 times.

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hatfieldphoto wrote on 9/10/2016, 3:46 AM

Thanks for that, I'll try it on RayGus's up to date 4K TV and see if the problem is still there. Thanks for the response. Phil