Question on sound bitrate and 1080 HD

[BunnyTwoFang]

I am running Windows 10 Tech Preview and would value someone who understands the log to clarify anything unusual please, but in particular clarify a couple of questions.
(My intended use is on an ATV3)

1. Sound. (I set it to 448 bitrate in Handbrake)
I am confused why it seems to imply that Handbrake is converting the stereo soundtrackto a mono soundtrack - which then goes to be converted to Dolby Pro format... - and then seems to lower the bitrate to 256Kbps.... (I told you I didn't understand it)

... EXTRACT ....
[18:55:48] scan: audio 0x1105: ac3, rate=48000Hz, bitrate=192000 Unknown (AC3) (1.0 ch)
[18:55:48] stream: 20 good frames, 0 errors (0%)
[18:55:48] scan: 10 previews, 1920x1080, 23.976 fps, autocrop = 142/138/6/8, aspect 16:9, PAR 1:1
[18:55:48] libhb: scan thread found 1 valid title(s)
[18:55:48] starting job
[18:55:48] work: sanitizing track 1 mixdown Dolby Pro Logic II to Mono
[18:55:48] work: sanitizing track 1 bitrate 448 to 256 Kbps
[18:55:48] work: track 1, dithering not supported by codec
[18:55:48] sync: expecting 139453 video frames
[18:55:48] work: only 1 chapter, disabling chapter markers
[18:55:48] job configuration:
[18:55:48] * source
------

2. HD questions
- Can the Bluray source disk be ripped either 720 or 1080 yet both still be classed as HD?
- Have I ripped it to a 'normal' HD 1080p resolution - because I do not read anywhere in the log which seems to state whether the output file is in an 1080 format resolution and not a 720 one.
- As I understand it, the 'finished' dimensions are now 1920 x 806. Is that so ?

Thanks in advance for clarification


--

http://pastebin.com/ztDSdAub

[moneymatt4life]

your source is mono... that's why handbrake is sanitizing your mixdown... and i'd suggest using AAC(FDK) instead of AAC(avcodec)

720p is HD, 1080p is FHD
your output dimensions should be 1906x800 based on your crop values... seems that it's being upscaled for some reason... use strict-anamorphic, if you don't plan to downscale(and aren't playing the video on older devices that may not support low modulus)

[BunnyTwoFang]

Thank you MoneyMatt4life for the very fast response.

I guess FHD is Full High Definition?

For my education, would you mind just spelling out which bit of log....

- Describes the format is already in mono
- How is the 1906x800 arrived at?
- Which part shows the upscaling going on please?
- I have to downscale later unfortunately, but I will test out Strict later.

Thanks again

[kpflugshaupt]

Thank you MoneyMatt4life for the very fast response.

I guess FHD is Full High Definition?

For my education, would you mind just spelling out which bit of log....

- Describes the format is already in mono
- How is the 1906x800 arrived at?
- Which part shows the upscaling going on please?
- I have to downscale later unfortunately, but I will test out Strict later.

Thanks again

Code: Select all

[18:55:48] scan: audio 0x1105: ac3, rate=48000Hz, bitrate=192000 Unknown (AC3) (1.0 ch)
[18:55:48] stream: 20 good frames, 0 errors (0%)
[18:55:48] scan: 10 previews, 1920x1080, 23.976 fps, autocrop = 142/138/6/8, aspect 16:9, PAR 1:1

• The end of the first line shows that there's only one channel of audio in the AC3, hence mono
• Third line shows that the autocropping mechanism decided to cut away (142+138) black pixels vertically and (6+8) pixels horizontally. Going in with 1920x1080, you'll thus end up with 1906x800.
• I see no upscaling happening in this part of the log -- are you sure it happened? (I cannot follow your pastebin link due to workplace restrictions)

Personally, I would not worry about the final pixel count, unless (a) you absolutely need to arrive at specific numbers for some reason or (b) the autocrop mechanism decided wrongly, which can happen if a film has variable aspect ratios. In both cases, disable auto cropping and enter the correct values.

Cheers
Kaspar

[BunnyTwoFang]

Thank you Kaspar.

As you can tell I am finding my feet. Appreciate the info.

[moneymatt4life]

yes, FHD is full HD

on the pastebin it says

Code: Select all

[18:55:48]      + Crop and Scale (1920:806:142:138:6:8)
[18:55:48]        + source: 1920 * 1080, crop (142/138/6/8): 1906 * 800, scale: 1920 * 806

in this instance, upscaling is taking place... although not much but it shouldn't be... i remember the GUI not allowing this to happen at one point, but it crept back in... but since you plan to downscale, i suppose you don't really need to worry about it...

[BunnyTwoFang]

yes, FHD is full HD

on the pastebin it says

Code: Select all

[18:55:48]      + Crop and Scale (1920:806:142:138:6:8)
[18:55:48]        + source: 1920 * 1080, crop (142/138/6/8): 1906 * 800, scale: 1920 * 806

in this instance, upscaling is taking place... although not much but it shouldn't be... i remember the GUI not allowing this to happen at one point, but it crept back in... but since you plan to downscale, i suppose you don't really need to worry about it...

Thank you for the explanation