Whats your advice for the AAC bitrate for DVD to X264 ?

[Nixeus]

Hello my friends,

I don't know if my post is in the good section.
I'm newbie in MP4 ( x264 with AAC encoding).

I would like an advice about tha AAC bitrate for a DVD to x624.
When i used Xvid+MP3, i used mp3@128kbps, so, wich bitrate can i take with AAC . 96kpbs?

Thanks a lot for your advice,

regards,

Nixeus

[tetsuo55]

I remember reading that 78kbit/s per channel is supposed to be transparent. That would be 156kbit/s for stereo.
If you are used to using 128kbit mp3, which does not sound transparent for most soundtracks, then 96 is probably fine.

[Nixeus]

Thanks for your answer,

MP3@128 is a good choice for a movie( not a music live)
So, what bitrate use you for dvd rip in AAC/X264?

[kypec]

Mods, please move this thread to Audio section, it doesn't really belong here.

So, what bitrate use you for dvd rip in AAC/X264?

First advice: use NeroAacEnc and not some FAAC or other crappy encoders.
Second advice (based on my personal preferences): for simple movies like older cartoons I tend to encode ~quality=0.30 (produces HE-AAC) up to quality=0.35 (produces LC-AAC)
For live movies I usually go with quality=0.40 or even 0.45 which I found totally transparent.

[Blue_MiSfit]

Moved to Audio Encoding forum.

[tebasuna51]

...
Second advice (based on my personal preferences): for simple movies like older cartoons I tend to encode ~quality=0.30 (produces HE-AAC) up to quality=0.35 (produces LC-AAC)
For live movies I usually go with quality=0.40 or even 0.45 which I found totally transparent.

Yes, mp4 (or mkv) support variable bitrate audio, then I always use at least NeroAacEnc -q 0.35 (to avoid some player problems with HE-AAC)

[Nixeus]

Thanks a lot,

I use MeGui with NeroAACEncoder.
I will try tu use 100kbps for movie's!

[Amateur]

Mods, please move this thread to Audio section, it doesn't really belong here.



First advice: use NeroAacEnc and not some FAAC or other crappy encoders.
Second advice (based on my personal preferences): for simple movies like older cartoons I tend to encode ~quality=0.30 (produces HE-AAC) up to quality=0.35 (produces LC-AAC)
For live movies I usually go with quality=0.40 or even 0.45 which I found totally transparent.
for a 23 minute cartoon episode, how large is the resulting audio mp4 if you set it to 0.35? i tend to use 64kbps which has been fine for me so i've never tried those q=# settings. also, is it better to use constant bitrate or adaptive?

secondary question: i haven't had a problem with audio until today. my vob file's volume is fine, the indexed ac3 file's volume is fine, but the resulting mp4 for one of my episodes is barely audible. i haven't changed any settings from any of my encodes so why is this one audio giving me trouble and how can i fix it?

[tebasuna51]

for a 23 minute cartoon episode, how large is the resulting audio mp4 if you set it to 0.35?
We can't know your source, try yourself.
... is it better to use constant bitrate or adaptive?
Adaptative.
secondary question: ... and how can i fix it?
We can't know the problem. Upload a sample.

[Amateur]

sorry about that. i was hoping it was a common problem that had some ideas for solutions. here is the indexed ac3 audio file. i am trying to keep original channels and use 64kbps adaptive he-aac to match the rest of the episodes. the mp4 just isn't loud enough at all even though the source is fine and other mp4 that i make are fine....

http://www.mediafire.com/?0qdl8l96b04m87a

[tebasuna51]

Your ac3 is corrupt after 21:42.496

But can be recoded without volume problems with:
eac3to your.ac3 output.m4a -q 0.28 -normalize

Maybe there are sync problems after 21:42.496

[Amateur]

hmmm...i wonder how that happened. it plays fine past that mark when i play it with media player classic or vlc. i guess i'll try re-ripping the vob from the disc and index the vob again to see if it works this time. i'll post the results.

edit: dvd decrypter did drop drastically in bitrate at around 91% but worked through it and went back up past 3,000 to complete...(no retries because of errors either)

edit2: same problems on second try. so now to find this eac3 program

edit3: so what do i do with all the files in the zip? do i move them to a self-made folder on my c drive?

edit4: i found out that i just extract the stuff in the zip to a folder of my choice but now i'm really stuck. HOW THE HECK DO I USE THIS PROGRAM? even the gui found on here is confusing as heck. if i double click the eac3to.exe file it will open a command prompt, scroll through a bunch of lines. then automatically close.

edit5: any way you can post your resulting file where the volume is fine because this eac3to is confusing the heck out of me. hopefully the file is around 11 or 12 mb at your settings

[tebasuna51]

...HOW THE HECK DO I USE THIS PROGRAM?

- To encode to AAC you need also NeroAacEnc.exe at same folder than eac3to.exe.

- Copy your input ac3 file to same folder and rename it to: "input.ac3"

- Use Notepad to create a "convert.bat" file (not "convert.bat.txt"), at same folder, with this text order:
eac3to input.ac3 output.m4a -quality=0.28 -normalize
pause

- Execute (double click) convert.bat

[Amateur]

i did all that and i get a message within the window that says "command line with parameter q is unknown"

i have neroaccenc, input.ac3, and convert.bat (not .bat.txt) all in the same folder as the eac3 folder.

[tebasuna51]

Sorry:
eac3to input.ac3 output.m4a -quality=0.28 -normalize

The sintax -q 0.28 is for NeroAacEnc

[ramicio]

What does encoding a cartoon have to do with audio? Sound is still produced from live actors, just the video is simpler.

[Amateur]

for a 23 minute cartoon episode, how large is the resulting audio mp4 if you set it to 0.35? i tend to use 64kbps which has been fine for me so i've never tried those q=# settings. also, is it better to use constant bitrate or adaptive?

secondary question: i haven't had a problem with audio until today. my vob file's volume is fine, the indexed ac3 file's volume is fine, but the resulting mp4 for one of my episodes is barely audible. i haven't changed any settings from any of my encodes so why is this one audio giving me trouble and how can i fix it?

What does encoding a cartoon have to do with audio? Sound is still produced from live actors, just the video is simpler.

if you're referring to my post above, i guess it doesn't matter that it was a cartoon. i just included that info because i have been encoding cartoons. the main part of the question i was wondering was what the size would be using those q-sizes instead of a specific bitrate.

[LoRd_MuldeR]

the main part of the question i was wondering was what the size would be using those q-sizes instead of a specific bitrate.

Impossible to predict, as it depends on the individual source.

The purpose of "quality based" encoding is that it will use as many bits as required for the individual source to retain the target quality level...

[kypec]

What does encoding a cartoon have to do with audio? Sound is still produced from live actors, just the video is simpler.
I've mentioned that because it is only my personal preference - cartoons are usually being watched mainly by my 3-year old daughter. We don't even have a surround home cinema speakers or anything like that, just an old CRT TV (mono speaker only I believe). Quality 0.35 provides in this case an adequate level in regard to listener's requirements and used audio equipment.
When I encode the audio tracks for sci-fi/action/adventure movies which I like to watch then quality=0.40 up to 0.45. I have a dream that one day I'll equip my living room with proper 5.1 surround speakers at last!:)