Yes, I have blind test myself of the two files that were recorded by bandicam.
One was H264 AVI mp3 256kbps, another one was H264 MP4 aac 192kbps,
Their sound quality are different. I can easily pick out the file of mp3 256kbps in the blind test.
The 256kbps MP3 has better sound than 192kbps AAC.
Due to the limiting of 192kbps of AAC of recording,
I need to switch to AVI instead of MP4 when
I need to record video with higher quality audio.
Because of only AVI format has the option to choose 256kbps MP3.
I think 256kbps is enough, so I choose 256kbps instead of 320kbps.
The highest quality of MP3 is 320kbps,
is the hightest quality of AAC is 192kbps?
Is this a bad idea to let the MP4 file to have an
option to choose mp3 format?
I think AVI is older and mp4 is newer, so I prefer to use MP4.
However the highest sound quality of MP4 is limited as AAC 192kbps.
Is this a good idea to use AVI instead of MP4 in the "Generation Alpha"?
If I may pop back in to try give an answer to a couple ideas you presented:
» The "highest quality of AAC" is not technically 192kbps (as a technological absolute limitation), but as Apple has stated (and enforced it seems), not many programs/applications will go above that, as it has become an accepted 'standard'. Apple has put out an iOS specification that shows the limit they present for Bluetooth/iOS devices as just above 256kbps (linked just below if I can add it, or at the bottom of this posting):
https://discussions.apple.com/content/a ... /857005040
(see bottom of posting)
As you have observed, above about 256kbps (using MPEG2/MP3 as an example), the fidelity starts to become 'lost' to most of us – I too think that about 256kbps (MPEG-2 audio) is pretty much fine [and it seems that testing and other sources agree with us, according to the Apple.com graphic/table above, as their specification is only just above that].
I only use 320kbps, as one day getting large, over-the-ear headphones as a gift, I started to notice the differences in [what I was using at the time] 128kbps and 320kbps audio encodes/archives I was doing - I essentially 'gave up on' 128kbps music archiving of my CDs and switched to 320kbps (as it seems many of the music community was doing at that time / talking about). Other than ever-so-slight fidelity differences I noticed, I leave the overhead (using 320kbps over 256kbps) for expected further compression loss. Overall though, Apple, the tests that the European Broadcasting Union did (and other tests no doubt), are enough to make companies (and program developers) 'limit' their bandwidth usage for audio, to about 192kbps for AAC, as a standard. This also allows more Bitrate for other uses (Video, etc) for things like Bluetooth and other medium with potential Bitrate limitations.
So, Bandicam (and others) use 192kbps AAC (for audio) as it is an accepted standard and for general use purposes (general public, etc), it seems fine. If you were doing Official Broadcasting of some kind (eg. News, Sports, National News, etc) then you’d likely want something more for fidelity, but you’d probably be using something in-house (provided by the network) anyway, heh.
» It is not really a ‘bad’ idea to use MP4 with MP3 audio [techncially, ‘any’ “container” can have almost ‘any’ “format” inside of it] - it is just something avoided as some editing programs do not ‘like’ certain formats or containers. To explain, try to think of multimedia files as two different ‘parts’: “Containers” are things like MP4, AVI, MKV, etc. - and these can be ‘filled’ with different formats of audio/video, like MP3, AAC, MPEG-2 video, MPEG-4 video, and others. These also change slightly over time. In the past, many used say, AVI with MPEG-4 (simple) video with MP3 audio, while today many use say, MP4 with MPEG-4 (advanced) video with AAC audio. [To further confuse things, most of these are just various types of MPEG formats (MP2, MP3, MP4, AAC, are all “MPEG-4” standards)].
Some video editing applications are more ‘fussy’ than others, refusing to open/recognize one format or another, or some container or another (for example, Sony’s Vegas Video editors used to not like MP3 audio very much, and many video editors still won’t open the MKV container). Of course, a lot of this technically depends on the Codecs and Splitters and Filters that are installed on the system. These are the formats that are installed/understood by the system, allowing Media Players and Video Editors to open them and use them. If one type or another is not installed, they may not be recognized by the system (some ‘general use’ codecs are installed in Windows by Default, that can open many different formats at once); so to get around this limitation, it is possible to just install the desired codec you wish to use. Bandicam works quite well with this, as they have included a “EXTERNAL CODEC” option, under their AVI container section (AVI is a more ‘general use’ container, able to hold a number of various formats, as is others like MKV).
So, the problems that can arise [with editing programs] make most programs avoid ‘mixing’ the formats that don’t normally go together [as generally accepted standards], so that’s why some combinations/choices are not readily available in recording/editing applications.
» You can use with AVI or MP4 if you wish, either one works great for recording with Bandicam, the only issues you might run into is that your preferred video editor (whatever that may be) may not ‘like it’ (recognize/be compatible with it as readily) – do some testing of short clips, to make sure whatever editing program you are using, can open the output recordings – and you’ll be fine.
HTH a bit