will there be quality loss if i convert from 1080p to 720p

[cns00]

i have done some experiments converting 1080p movies which have been ripped from blu ray and they have video bitrate 2250 kbps to 720p. the settings that i used in handbrake are: 720p, x264 mp4, slow preset, high encoding profile, turbo first pass, two pass encoding, constant frame rate, same frame rate as source, audio 128 kbps aac and video bitrate 900 kbps. i noticed loss of quality in the background in the encoded movie and the color was faded and blurry in some areas

i need to convert an anime episode to 720p. this is the media info of the source file:-

[Attachment 64970 - Click to enlarge]

this time i used constant quality in handbrake to do the encoding. this is the settings that i used:-

[Attachment 64973 - Click to enlarge]

this is the media info of the encoded file:-

[Attachment 64974 - Click to enlarge]

will there be loss of quality in the encoded file like what happened before when i was experimenting?

[Selur]

will there be loss of quality in the encoded file like what happened before when i was experimenting?

Since you are using a lossy compression, your encode will naturally be lossy.

[Alwyn]

will there be loss of quality in the encoded file like what happened before when i was experimenting?

It should be better, as you've gone from 900kbps to 1268kbps. Whether that is a large-enough increase to improve the background to an acceptable quality, you'll have to compare.

[Cornucopia]

Correction, @Alwyn, there MAY BE LESS LOSS. Big difference.

Saying it is improved/better when re-encoding lossily is like saying you are "saving/making money" if you take advantage of a store sale. You are still spending money you don't have to (LOSS), it just happens to be less money spent than without a sale (LESS LOSS).

Scott

[Alwyn]

Correction, @Alwyn, there MAY BE LESS LOSS. Big difference.

No, "better" was the 1268 version compared to the 900 version, obviously not the 1268 (or 900) to the 2250.

Thanks for the lecture. I'm not that stupid, Scott.

[Cornucopia]

Sorry if I came off the wrong way, @Alwyn. I don't know you very well yet, but I don't think you're stupid.

But "gone from 900kbps to 1268kbps" can be and HAS BEEN misconstrued on this site to mean an additional generation going 2250-->900-->1268, or many other things, by those who ARE that stupid. I was writing that not necessarily to you, but more for that audience to set the record straight. You just happened to trip the wire, mainly because while it may be obvious to some of us, it is not obvious to many others and this site is one of the few where it BS, vagueness, and disinformation is kept at bay (or at least some attempt to).

Scott

[krykmoon]

regardless the fact that every re-encoding with a lossy codec does not preserve the original "quality" (the resulting video with good settings might be perceptually identical quality wise, but something will be different, anyway) .. you are not simply re-encoding the video (using a different bitrate).. you are also downscaling it from 1080p to 720p (losing 1/3 of the original information).. So.. every pixel will be different in the re-encoded file (every pixel will be re-interpolated to obtain 2/3 of the original ones). It's a very destructive process, you will lose a lot of information and the quality of the new video will always be ways lower, even with optimal settings..

[johns0]

If you watch the 720p video on a 1080p tv it will look good as long as the original was good,then watch the the 720p on a 2160p tv then you will notice the difference,so if you are never going buy a uhd tv then it won't matter.

[VoodooFX]

Sometimes I think that this forum was meant to be named VideoNonsense.

[johns0]

Your response is nonsense.