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#16
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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. :-) |
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#17
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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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