which Video Quality would you suggest and Why?

[majid_aryaee]

there are 2 MKV video quality option

1) Source : 1080p Bluray ------ Resolution : 1536*864 ------ Video Bitrate : 2574 kbps ------ Video Codec : x264 Size( total Video + Audio) : 2.4 G

2) Source : 720p Bluray ------- Resolution : 1280*720 ------ Video Bitrate : 4140 kbps ------ video Codec : AVC Size( total Video + Audio) : 4.37 G

Thank you

[Case]

How can you compare a low bitrate large file with a high bitrate small file? They must have different duration...

[jagabo]

Whichever one looks and sounds better.

[majid_aryaee]

hi , both are same length 109 min

[majid_aryaee]

How can you compare a low bitrate large file with a high bitrate small file? They must have different duration...

thanks. yes there was mistake in Size. I edit it. but the question still stands.

[edDV]

If they were both encoded from a high quality 24p source, the higher bit rate 720p should look better. This has to be factored by the source resolution. If the source resolution was 1080p/24, the 720p would have some downsize loss. If the source was 720p, the 1080p file would suffer serious upscale losses.

If the source was 1080i many other issues come into play such as inverse telecine or deinterlace methods used.

So, as you can see, we need more data about the source and workflow.

[Bonie81]

majid_aryaee

what you forget to mention is audio specification, if it is AAC, i wud probably trash both.
if size is same and there is no audio i wud go for the one having higher video bit rate.

[jagabo]

If it's a 109 minute slideshow the first one will likely look better. If it's a high action video the second one will likely look better. But it all depends on the knowledge of the person making the two videos, what tools they used, what settings were used, etc. In short, the only way you will know for sure is to get them both and view them. Hence my first answer.

[majid_aryaee]

If they were both encoded from a high quality 24p source, the higher bit rate 720p should look better. This has to be factored by the source resolution. If the source resolution was 1080p/24, the 720p would have some downsize loss. If the source was 720p, the 1080p file would suffer serious upscale losses.

If the source was 1080i many other issues come into play such as inverse telecine or deinterlace methods used.

So, as you can see, we need more data about the source and workflow.

hi thanks. i'm very new with these but i know both have Frame Rate : 23.976 fps.

[edDV]

there are 2 MKV video quality option

1) Source : 1080p Bluray ------ Resolution : 1536*864 ------ Video Bitrate : 2574 kbps ------ Video Codec : x264 Size( total Video + Audio) : 2.4 G

2) Source : 720p Bluray ------- Resolution : 1280*720 ------ Video Bitrate : 4140 kbps ------ video Codec : AVC Size( total Video + Audio) : 4.37 G

Thank you

1. Source 1080p/24 downsized to 1536x864 low bit rate will have serious compression artifacts.

2. Source 720p/24 at native resolution and 60% more bit rate vs. #1 should look much better for a typical movie. But it will be degraded vs. the Blu-Ray source.


As a general rule bit rate (lower digital artifacts) wins over resolution for HD picture quality. So for a given bit rate (say 4 Mb/s h.264), 720p/24 will look better than 1080p/24 especially with high action movies. This becomes more the case as bit rates are lowered. At higher bit rates, 1080p may start to look better above 9 Mb/s depending on movie content.

[majid_aryaee]

majid_aryaee

what you forget to mention is audio specification, if it is AAC, i wud probably trash both.
if size is same and there is no audio i wud go for the one having higher video bit rate.

both are AC3.

[majid_aryaee]

there are 2 MKV video quality option

1) Source : 1080p Bluray ------ Resolution : 1536*864 ------ Video Bitrate : 2574 kbps ------ Video Codec : x264 Size( total Video + Audio) : 2.4 G

2) Source : 720p Bluray ------- Resolution : 1280*720 ------ Video Bitrate : 4140 kbps ------ video Codec : AVC Size( total Video + Audio) : 4.37 G

Thank you

1. Source 1080p/24 downsized to 1536x864 low bit rate will have serious compression artifacts.

2. Source 720p/24 at native resolution and 60% more bit rate vs. #1 should look much better for a typical movie. But it will be degraded vs. the Blu-Ray source.

thaaaaaaaanks alooooot

[jagabo]

1. Source 1080p/24 downsized to 1536x864 low bit rate will have serious compression artifacts.

Not necessarily. A 109 minute slideshow could be compressed down to nearly nothing and still look great. I know you know this but the OP doesn't.

OP: look at the videos in this post:

https://forum.videohelp.com/threads/295672-A-problem-for-video-experts?p=1811057&viewfu...=1#post1811057

They're standard definition and Xvid (not high def and AVC) but the idea is the same. The lowest bitrate video looks the best -- with 1/20 the bitrate of the highest bitrate video. It all depends on the properites of the video.

[edDV]

1. Source 1080p/24 downsized to 1536x864 low bit rate will have serious compression artifacts.

Not necessarily. A 109 minute slideshow could be compressed down to nearly nothing and still look great. I know you know this but the OP doesn't.

OP: look at the videos in this post:

https://forum.videohelp.com/threads/295672-A-problem-for-video-experts?p=1811057&viewfu...=1#post1811057

They're standard definition and Xvid (not high def and AVC) but the idea is the same. The lowest bitrate video looks the best -- with 1/20 the bitrate of the highest bitrate video. It all depends on the properites of the video.

Yes there are exceptions. 1080p/24 looks nice for low action stationary scenery but is more subject to digital artifacts during motion for a given codec/bitrate. 720p/24 will not be as sharp for stationary scenery but will handle motion better with less artifacting.

[majid_aryaee]

1. Source 1080p/24 downsized to 1536x864 low bit rate will have serious compression artifacts.

Not necessarily. A 109 minute slideshow could be compressed down to nearly nothing and still look great. I know you know this but the OP doesn't.

OP: look at the videos in this post:

https://forum.videohelp.com/threads/295672-A-problem-for-video-experts?p=1811057&viewfu...=1#post1811057

They're standard definition and Xvid (not high def and AVC) but the idea is the same. The lowest bitrate video looks the best -- with 1/20 the bitrate of the highest bitrate video. It all depends on the properites of the video.

I'm soooooo thankful to all you guys and really i'm learning also from you sharing knowledge to people