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audio extraction: do .mp4 videos always contain .m4a audio?



 
 
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  #16  
Old October 18th 18, 07:03 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Bill in Co
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Posts: 1,927
Default audio extraction: do .mp4 videos always contain .m4a audio?

J. P. Gilliver (John) wrote:
In message , Bill in Co
writes:
J. P. Gilliver (John) wrote:
In message , Bill in Co
writes:
[]
M4A is a file extension for an audio file encoded with advanced audio
coding (AAC). I don't believe most mp4 files have mp3 audio tracks.
If you don't want any transcoding (to mp3), I think you're stuck with
playing aac audio files, which some players can do. It is possible,
however, to download a mp4 file and extract the aac track without any
transcoding.
Yes, I think that's what Pazera is doing. I just hadn't realised that
.m4a was AAC; I'd thought it was an obscure format.

I take it that .aac as a file extension isn't used much (at all?).


No, I wouldn't quite take it that way :-) I think it's the default
audio extension for anything Apple related (well, that, and .m4a).
(think of


So what is the _difference_ between (files ending in) .aac and .m4a then
- if there is one?

iTunes, for example).


I'd rather not (-:. From what I've seen, it takes over, unless you spend
time keeping it in check.

But for us PC users, I think mp3 is much more commonly used. I don't
have any interest in iTunes, thank you very much. :-)

Me too. I have seen the Apple Kool-aid, and I can see that it tastes
nice; I prefer more to keep control of my machine, though.


Some have called it a "walled garden". I think that term (for Apple
products) is very appropos. But that has its advantages, and it works well
for some people. I just prefer more freedom to choose. And yes, take some
risks along the way. :-)


Ads
  #17  
Old October 18th 18, 07:11 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default audio extraction: do .mp4 videos always contain .m4a audio?

J. P. Gilliver (John) wrote:

So what is the _difference_ between (files ending in) .aac and .m4a then
- if there is one?


One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.

For packetized formats (potentially M4A at least), ffprobe
can dump the file as packets. So at least you can see
a structure. That's how I figure out the cadence of
groups of pictures in a movie, is using that as a tool
of examination.

You'd need samples of the file types and a hex editor
to satisfy your curiosity.

What matters more, is for each format, what tools
or devices automatically recognize them ?

Paul
  #18  
Old October 18th 18, 08:02 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Bill in Co
external usenet poster
 
Posts: 1,927
Default audio extraction: do .mp4 videos always contain .m4a audio?

Paul wrote:
J. P. Gilliver (John) wrote:

So what is the _difference_ between (files ending in) .aac and .m4a then
- if there is one?


One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.

For packetized formats (potentially M4A at least), ffprobe
can dump the file as packets. So at least you can see
a structure. That's how I figure out the cadence of
groups of pictures in a movie, is using that as a tool
of examination.

You'd need samples of the file types and a hex editor
to satisfy your curiosity.

What matters more, is for each format, what tools
or devices automatically recognize them ?

Paul


Yes, according to:

https://stackoverflow.com/questions/...ac-audio-files

..m4a is really a "container", whereas .aac is the actual audio. And
interestingly that site above says .m4a does not "have" to contain .aac, but
I imagine that situation is a rarity.

But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for most
software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo


  #19  
Old October 18th 18, 09:00 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Shadow
external usenet poster
 
Posts: 1,638
Default audio extraction: do .mp4 videos always contain .m4a audio?

On Thu, 18 Oct 2018 13:02:01 -0600, "Bill in Co"
wrote:

Paul wrote:
J. P. Gilliver (John) wrote:

So what is the _difference_ between (files ending in) .aac and .m4a then
- if there is one?


One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.

For packetized formats (potentially M4A at least), ffprobe
can dump the file as packets. So at least you can see
a structure. That's how I figure out the cadence of
groups of pictures in a movie, is using that as a tool
of examination.

You'd need samples of the file types and a hex editor
to satisfy your curiosity.

What matters more, is for each format, what tools
or devices automatically recognize them ?

Paul


Yes, according to:

https://stackoverflow.com/questions/...ac-audio-files

.m4a is really a "container", whereas .aac is the actual audio. And
interestingly that site above says .m4a does not "have" to contain .aac, but
I imagine that situation is a rarity.

But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for most
software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo


Mediainfo light:


http://www.codecguide.com/download_other.htm#mediainfo

Small, allows you to right click on any file and see what the
streams are.
No "junk". Mediainfo full is (used to be, anyway) ad-ware.
[]'s

PS Youtube videos have always been aac for me in MP4
containers. I think it's a Glugle thing, even if you upload in another
format they will re-encode it to aac for MP4. Ogg-Vorbis for webm
files.
--
Don't be evil - Google 2004
We have a new policy - Google 2012
  #20  
Old October 18th 18, 09:07 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
J. P. Gilliver (John)[_4_]
external usenet poster
 
Posts: 2,679
Default audio extraction: do .mp4 videos always contain .m4a audio?

In message , Bill in Co
writes:
Paul wrote:
J. P. Gilliver (John) wrote:

So what is the _difference_ between (files ending in) .aac and .m4a then
- if there is one?


One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.


Thanks. (I wonder what the _point_ of a single-stream container is - for
audio, anyway!)
[]
What matters more, is for each format, what tools
or devices automatically recognize them ?

My GoldWave 5.58 doesn't either automatically recognise .m4a, or make
any sense of them if I manually load them into it. (Well, I haven't
tried _all_ the options.) I can't remember whether my WinAmp does.

Paul


Yes, according to:

https://stackoverflow.com/questions/...ifference-betw
een-m4a-and-aac-audio-files

.m4a is really a "container", whereas .aac is the actual audio. And
interestingly that site above says .m4a does not "have" to contain .aac, but
I imagine that situation is a rarity.


I suspect you're right.

But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for most
software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)

--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

(Petitions - at least e-petitions - should collect votes both for and
against, if they're going to be reported as indicative of public [UK only]
opinion. If you agree, please click below, unless you already have.)
https://petition.parliament.uk/petit...BYobumelL9J54c

While no one was paying attention, weather reports became accurate and the
news became fiction. Did not see that coming. - Scott Adams, 2015
  #21  
Old October 18th 18, 09:19 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Bill in Co
external usenet poster
 
Posts: 1,927
Default audio extraction: do .mp4 videos always contain .m4a audio?

Shadow wrote:
On Thu, 18 Oct 2018 13:02:01 -0600, "Bill in Co"
wrote:

Paul wrote:
J. P. Gilliver (John) wrote:

So what is the _difference_ between (files ending in) .aac and .m4a
then - if there is one?

One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.

For packetized formats (potentially M4A at least), ffprobe
can dump the file as packets. So at least you can see
a structure. That's how I figure out the cadence of
groups of pictures in a movie, is using that as a tool
of examination.

You'd need samples of the file types and a hex editor
to satisfy your curiosity.

What matters more, is for each format, what tools
or devices automatically recognize them ?

Paul


Yes, according to:

https://stackoverflow.com/questions/...ac-audio-files

.m4a is really a "container", whereas .aac is the actual audio. And
interestingly that site above says .m4a does not "have" to contain .aac,
but I imagine that situation is a rarity.

But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for most
software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo


Mediainfo light:


http://www.codecguide.com/download_other.htm#mediainfo

Small, allows you to right click on any file and see what the
streams are.
No "junk". Mediainfo full is (used to be, anyway) ad-ware.
[]'s

PS Youtube videos have always been aac for me in MP4
containers. I think it's a Glugle thing, even if you upload in another
format they will re-encode it to aac for MP4. Ogg-Vorbis for webm
files.


My old version seems to be clean, but I can't testify as the new ones, and
maybe the light version is a good solution. My older version also allows me
to hover over the file in Windows Explorer, and see its "contents" at a
glance.

And I think YouTube is trying to go the way of .webm, and eventually ditch
..mp4, sad to say. I say "sad to say", as I have some nice utilities that
work on the video or the audio for .mp4 files, but not for .webm and .ogg.


  #22  
Old October 18th 18, 09:24 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Bill in Co
external usenet poster
 
Posts: 1,927
Default audio extraction: do .mp4 videos always contain .m4a audio?

J. P. Gilliver (John) wrote:
In message , Bill in Co
writes:
Paul wrote:
J. P. Gilliver (John) wrote:

So what is the _difference_ between (files ending in) .aac and .m4a
then - if there is one?

One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.


Thanks. (I wonder what the _point_ of a single-stream container is - for
audio, anyway!)


Some flexibility? In case something else could be added? That's my
guess.

[]
What matters more, is for each format, what tools
or devices automatically recognize them ?

My GoldWave 5.58 doesn't either automatically recognise .m4a, or make
any sense of them if I manually load them into it. (Well, I haven't
tried _all_ the options.) I can't remember whether my WinAmp does.

Paul


Yes, according to:

https://stackoverflow.com/questions/...ifference-betw
een-m4a-and-aac-audio-files

.m4a is really a "container", whereas .aac is the actual audio. And
interestingly that site above says .m4a does not "have" to contain .aac,
but I imagine that situation is a rarity.


I suspect you're right.

But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for most
software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)


Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.


  #23  
Old October 18th 18, 09:33 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
J. P. Gilliver (John)[_4_]
external usenet poster
 
Posts: 2,679
Default audio extraction: do .mp4 videos always contain .m4a audio?

In message , Bill in Co
writes:
J. P. Gilliver (John) wrote:
In message , Bill in Co
writes:
Paul wrote:

[]
One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.


Thanks. (I wonder what the _point_ of a single-stream container is - for
audio, anyway!)


Some flexibility? In case something else could be added? That's my
guess.

I'm probably missing your point, but: if you're going to add something,
then sure, use a wrapper to contain the audio stream plus whatever
you're adding; but for just the audio, why?
[]
But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for most
software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)


Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.

Got a link to that version?

--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

(Petitions - at least e-petitions - should collect votes both for and
against, if they're going to be reported as indicative of public
opinion. If you agree, please click below, unless you already have.)
https://petition.parliament.uk/petit...n=gHafDVBYobum
elL9J54c

While no one was paying attention, weather reports became accurate and the
news became fiction. Did not see that coming. - Scott Adams, 2015
  #24  
Old October 18th 18, 10:01 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Bill in Co
external usenet poster
 
Posts: 1,927
Default audio extraction: do .mp4 videos always contain .m4a audio?

J. P. Gilliver (John) wrote:
In message , Bill in Co
writes:
J. P. Gilliver (John) wrote:
In message , Bill in Co
writes:
Paul wrote:

[]
One has a container around it, and one doesn't ?
The M4A is likely to be a single-stream container.

Thanks. (I wonder what the _point_ of a single-stream container is - for
audio, anyway!)


Some flexibility? In case something else could be added? That's my
guess.

I'm probably missing your point, but: if you're going to add something,
then sure, use a wrapper to contain the audio stream plus whatever
you're adding; but for just the audio, why?


I don't know. Maybe some extra tagging information? Mp3's normally store
their tags directly in the mp3 file as ID3 tags and there are at least two
versions of those (and one of these goes at the head of the file, and the
other at the end of the file). Thr tags contain things like the artist,
song title, genre, etc.

[]
But again, the OP (John) might find MediaInfo a useful utility on
identifying some of this stuff. I sure have found it handy. :-) I'm
still using an older version 0.7.60 (which is the norm for me for
most software, since they invariably keep adding more junk)

https://mediaarea.net/en/MediaInfo

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)


Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.


Got a link to that version?


Not on me. I usually use Google to search for the old versions, but
filehippo is one site that often has old versions of many programs. Of
course oldversion.com and oldapps.com are nice for the more common programs.


  #25  
Old October 18th 18, 10:22 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
J. P. Gilliver (John)[_4_]
external usenet poster
 
Posts: 2,679
Default audio extraction: do .mp4 videos always contain .m4a audio?

In message , Bill in Co
writes:
J. P. Gilliver (John) wrote:

[]
I'm probably missing your point, but: if you're going to add something,
then sure, use a wrapper to contain the audio stream plus whatever
you're adding; but for just the audio, why?


I don't know. Maybe some extra tagging information? Mp3's normally store
their tags directly in the mp3 file as ID3 tags and there are at least two
versions of those (and one of these goes at the head of the file, and the
other at the end of the file). Thr tags contain things like the artist,
song title, genre, etc.


Ah, I see - you mean .aac doesn't have anything like ID3 tags, but .m4a
might.
[]
But again, the OP (John) might find MediaInfo a useful utility on

[]
https://mediaarea.net/en/MediaInfo

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)

Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.


Got a link to that version?


Not on me. I usually use Google to search for the old versions, but
filehippo is one site that often has old versions of many programs. Of
course oldversion.com and oldapps.com are nice for the more common programs.

filehippo only had 18.x, but oldversion had 0.7.57/8/9/60/61 - of sizes
2.14/2.14/2.15/2.15/4.26, so you (and now I) have the last one before
the size started to shoot up!

--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

(Petitions - at least e-petitions - should collect votes both for and
against, if they're going to be reported as indicative of public
opinion. If you agree, please click below, unless you already have.)
https://petition.parliament.uk/petit...BYobumelL9J54c

The losses on both sides at Borodino [1812], 70 miles from Moscow, are the
equivalent of a jumbo jet crashing into an area of six square miles every five
minutes for the whole ten hours of the battle, killing or wounding everyone on
board. - Andrew Roberts on Napoleon, RT 2015/6/13-19
  #26  
Old October 18th 18, 11:08 PM posted to alt.windows7.general
Monty
external usenet poster
 
Posts: 598
Default audio extraction: do .mp4 videos always contain .m4a audio?

On Thu, 18 Oct 2018 21:33:25 +0100, "J. P. Gilliver (John)"
wrote:


Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.

Got a link to that version?


Perhaps oldversion.com

  #27  
Old October 19th 18, 01:22 AM posted to alt.windows7.general,microsoft.public.windowsxp.general
Shadow
external usenet poster
 
Posts: 1,638
Default audio extraction: do .mp4 videos always contain .m4a audio?

On Thu, 18 Oct 2018 21:33:25 +0100, "J. P. Gilliver (John)"
wrote:

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)


Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.

Got a link to that version?


Mediainfo light:

http://www.codecguide.com/download_other.htm#mediainfo

Just over 2Mb. Uses the same DLL as the original Mediainfo, so
latest version is also 18.08.1 (Which translates as August 2018, minor
update).
Are you filtering me ? If so, someone else repost pls.
[]'s
--
Don't be evil - Google 2004
We have a new policy - Google 2012
  #28  
Old October 19th 18, 01:40 AM posted to alt.windows7.general,microsoft.public.windowsxp.general
Shadow
external usenet poster
 
Posts: 1,638
Default audio extraction: do .mp4 videos always contain .m4a audio?

On Thu, 18 Oct 2018 21:22:00 -0300, Shadow wrote:

On Thu, 18 Oct 2018 21:33:25 +0100, "J. P. Gilliver (John)"
wrote:

Wow, the one I just downloaded is 18.08.1! (Mind you, still only 5½ MB,
so there's some hope for it.)

Well that sucks. That's why I mentioned the old version, or as Shadow
mentioned, the light version.

Got a link to that version?


Mediainfo light:


Sorry, I meant mediainfo LITE, not light. Personal RAM with
some bad capacitors.

http://www.codecguide.com/download_other.htm#mediainfo

Just over 2Mb. Uses the same DLL as the original Mediainfo, so
latest version is also 18.08.1 (Which translates as August 2018, minor
update).
Are you filtering me ? If so, someone else repost pls.
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
 




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