Advice with encoding mp4 to compliant blu ray file with close to loseless

[Littlebase631]

Hi all, so I’m currently working on a project for myself I’m working with multiple mp4 files that are 1280x720 with a 4,500 mb/s rate and a 29.97 frame rate and I’m encoding them so they’re blu ray compliant. I’m currently using tmpgenc authoring works 7. Obviously the goal is to lose the least amount of quality possible so I have my encoding settings at high profile 4.1, 59.97 fps, max bitrate at 23,000, avg bitrate at 10,300 and 2 pass vbr on the very slow option.

Am I wasting time with these settings? Will the higher bitrate offset the loss in quality due to encoding? Will the 2 pass help with the quality? Would these settings be good enough with a 1 pass vbr?

[Swedaniel]

Hi all, so I’m currently working on a project for myself I’m working with multiple mp4 files that are 1280x720 with a 4,500 mb/s rate and a 29.97 frame rate and I’m encoding them so they’re blu ray compliant. I’m currently using tmpgenc authoring works 7. Obviously the goal is to lose the least amount of quality possible so I have my encoding settings at high profile 4.1, 59.97 fps, max bitrate at 23,000, avg bitrate at 10,300 and 2 pass vbr on the very slow option.

Am I wasting time with these settings? Will the higher bitrate offset the loss in quality due to encoding? Will the 2 pass help with the quality? Would these settings be good enough with a 1 pass vbr?

Maybe you could try use the "Auto" for the fps! Im not sure about the program you are using, but in for example Avidemux you can just click an box "BluRay compability", seem to me the "High" profile fail to play in some video players while the "Main" got things going!

Edit: If you would decide to try Avidemux i think selecting "Average bitrate" is same or similar to VBR.. i tested with settings around 700-900 kbit/s, it seem to do allright to me, could probably boost it some to be sure!

[Littlebase631]

Those are the settings it picked by default I just enabled 2 pass and very slow option to ensure the best quality and upped the bitrate by 300 mbbs to max out the file sizes on disc without going over the disc capacity.

[Swedaniel]

I just enabled 2 pass and very slow option to ensure the best quality

Yeah the very slow encoding options seem to work out real good, i use it as often as i can, it take pretty long time sometimes to encode but it seem to be worth it!

Edit: If using a lil bit lower bitrate (ie. 700-800) and slightly lower fps (ie 25-30) they seem to function with video players that can crash/lagg with 60 fps mp4's and higher bitrates, maybe same with blu ray players? to much bit rates and fps maybe some cant handle the video? the lower fps and bitrate videos seem to require less performance allso and play a lil bit easier on the pc atleast, i think the VBR choice would help prevent such issues compared to CBR!

[ProWo]

Hi all, so I’m currently working on a project for myself I’m working with multiple mp4 files that are 1280x720 with a 4,500 mb/s rate and a 29.97 frame rate and I’m encoding them so they’re blu ray compliant. I’m currently using tmpgenc authoring works 7. Obviously the goal is to lose the least amount of quality possible so I have my encoding settings at high profile 4.1, 59.97 fps, max bitrate at 23,000, avg bitrate at 10,300 and 2 pass vbr on the very slow option.

Am I wasting time with these settings? Will the higher bitrate offset the loss in quality due to encoding? Will the 2 pass help with the quality? Would these settings be good enough with a 1 pass vbr?

1280 × 720 29.97p, 16:9 is already Blu-ray compliant.
So if you want the maximum quality, take the videos as they are.
Any further encoding will degrade the quality.
https://en.wikipedia.org/wiki/Blu-ray#Video

[poisondeathray]

1280 × 720 29.97p, 16:9 is already Blu-ray compliant.
So if you want the maximum quality, take the videos as they are.
Any further encoding will degrade the quality.
https://en.wikipedia.org/wiki/Blu-ray#Video

That wikipedia reference is wrong .

For 1280x720 29.97p to be BD compliant , you need a frame repeat flag, or 59.94 with actual duplicates.

(There are other considerations, such as buffer, GOP size, references to make it fully compatible - but an authoring tool that re-encodes should get it right)

[ProWo]

1280 × 720 29.97p, 16:9 is already Blu-ray compliant.
So if you want the maximum quality, take the videos as they are.
Any further encoding will degrade the quality.
https://en.wikipedia.org/wiki/Blu-ray#Video

That wikipedia reference is wrong .

For 1280x720 29.97p to be BD compliant , you need a frame repeat flag, or 59.94 with actual duplicates.

(There are other considerations, such as buffer, GOP size, references to make it fully compatible - but an authoring tool that re-encodes should get it right)

Ah, ok, thank you.

[Littlebase631]

So after a comparison I made with 2 pass video and 1 pass video I see no change in quality at all so I’m going to stick with the 1 pass vbr at very slow settings