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#11
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Does .mp4 - or any other video format - have a text field (comment, not subtitle)? If so, what can edit it?
In message , R.Wieser
writes: John, _is_ there something intrinsic to the format? The specs to the format seem to indicate there is, and I found something to manipulate it here : https://community.wd.com/t/how-do-yo...kv-and-mp4-fil es/169392 VLC does it for some video files, using something that was/is so obvious I hadn't spotted it (-: [] Personally I would not depend on those ADSes, but wanted to name them regardless. - both as an option, but also as a warning :-) I don't want to use something associated by the filesystem; that's not that different, to me, from storing a text file of the same name in the folder. I wanted something that actually makes the comment part of the file, like IrfanView (and maybe others?) does with .jpg comments: so that they'd even survive being emailed, for example. (Not that I'd often email video files, I just give that as an example.) Regards, Rudy Wieser P.s. Had to remove "uk.tech.broadcast". Its not carried by my usenet server. Interesting; I don't think any of the servers I use (with the possible exception of the Mozilla one) object to such headers. My news _software_ fails if I try to post something where _none_ of the 'groups specified are carried by any of the servers, but not where only some of them aren't. (It doesn't _tell_ me it's failing - just the post sits in the outbox for ever, doesn't go. [It _does_ object if I use a newsgroup it knows is carried by _none_ of the servers it deals with, as I just rediscovered as I'd mistyped UTB.]) Note I've added UTB back in case anyone there is following. -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf "Scheisse," said Pooh, trying out his German. |
#12
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Does .mp4 - or any other video format - have a text field (comment,not subtitle)? If so, what can edit it?
J. P. Gilliver (John) wrote:
In message , R.Wieser writes: John, _is_ there something intrinsic to the format? The specs to the format seem to indicate there is, and I found something to manipulate it here : https://community.wd.com/t/how-do-yo...kv-and-mp4-fil es/169392 VLC does it for some video files, using something that was/is so obvious I hadn't spotted it (-: [] Personally I would not depend on those ADSes, but wanted to name them regardless. - both as an option, but also as a warning :-) I don't want to use something associated by the filesystem; that's not that different, to me, from storing a text file of the same name in the folder. I wanted something that actually makes the comment part of the file, like IrfanView (and maybe others?) does with .jpg comments: so that they'd even survive being emailed, for example. (Not that I'd often email video files, I just give that as an example.) Regards, Rudy Wieser P.s. Had to remove "uk.tech.broadcast". Its not carried by my usenet server. Interesting; I don't think any of the servers I use (with the possible exception of the Mozilla one) object to such headers. My news _software_ fails if I try to post something where _none_ of the 'groups specified are carried by any of the servers, but not where only some of them aren't. (It doesn't _tell_ me it's failing - just the post sits in the outbox for ever, doesn't go. [It _does_ object if I use a newsgroup it knows is carried by _none_ of the servers it deals with, as I just rediscovered as I'd mistyped UTB.]) Note I've added UTB back in case anyone there is following. Just a couple quick notes. 1) The file extension might be used to signify the "container". .mkv, .avi, .mp4 might be containers. The reference section at the bottom, has a list of containers. The Apple MOV container, became the prototype of one of the newer standard container. https://en.wikipedia.org/wiki/.mkv The "container" can contain multiple kinds of "codecs" for audio and video. For example, .wtv files from Windows Media Center, basically just record off the DVB you're getting, and keep five audio and video streams in the same file. This then requires a "selector" to select the desired stream, on "dumb" players. This command selects stream 2,3 from the five available. ffplay -ast 2 -vst 3 -x 704 -y 480 some.wtv In some cases, when a container has only audio in it, the file extension changes (to help "home collectors"). Maybe that would be .m4a or the like. 2) Whether they're images or video, formats which use packets and the packet header uses a 4CC (four character code), those allow out of band material to be added. video_packet video_packet audio_packet video_packet video_packet video_packet comment audio_packet video_packet The idea is, the parser playing the movie, reads the packets with the identifiers it understands (video,audio), and ignores any other comment. This allows EXIF and XMP to be injected into the same file, as they could just be packets. 3) Formats that are not packetized, may still offer opportunities for the addition of metadata, but due to a lack of standards for that, it's not very useful. A text PPM file for example, is text inside, and any line beginning with "#" is a comment. A comment where you could hide some necessary info. Don't expect any tool flow or Windows Search to honor such a feature. There are a few tools that are useful. 1) GSpot for CODEC identification within the container. 2) HxD hex editor, if you really want to examine the file format. 3) EXIFTool, if studying EXIF data. 4) FFProbe (a part of FFMPEG) can convert the packets into individually delimited pages in a "dump". You can see the interleaved video and audio pattern. The IPB frames. And FFProbe would also identify the CODECs present. (A good choice, since FFMPEG is kept up-to-date. GSpot development stopped some time ago.) Windows Search only has search providers for a limited set of EXIF types. For example ext:jpg AND camera:Nikon might dig up all the JPG files photographed with a Nikon camera. You can actually dump the windows.esb (esedb) and find out what kind of fields are in it. (That's if you don't trust the latest web documentation for how the search works.) Peter is the person who most often asks questions about this aspect. He must be an expert by now. Paul |
#13
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Does .mp4 - or any other video format - have a text field (comment, not subtitle)? If so, what can edit it?
John,
that's not that different, to me, from storing a text file of the same name in the folder. The difference is that in the case of ADSes the filesystem maintains the connection (read: below OS level), and in the above you are the sole manager of it (the filesystem nor the OS is aware of any such linking). Interesting; I don't think any of the servers I use (with the possible exception of the Mozilla one) object to such headers. Well, AIOE did. It refused to accept the post until I removed that newsgroup .... though now I think of it, it *might* have been a simple "too many groups" problem. Lets see what happens when I remove windows7 instead. Regards, Rudy Wieser |
#14
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Does .mp4 - or any other video format - have a text field(comment, not subtitle)? If so, what can edit it?
On 11/07/2018 08:52, R.Wieser wrote:
... though now I think of it, it *might* have been a simple "too many groups" problem. Lets see what happens when I remove windows7 instead. Grin (Deliberate misunderstanding) Replacing it with XP is a good start. -- Tciao for Now! John. |
#15
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Does .mp4 - or any other video format - have a text field (comment, not subtitle)? If so, what can edit it?
John Williamson,
Grin (Deliberate misunderstanding) Replacing it with XP is a good start. Well, someone told me that Win7 is at least halfway decent. You don't *have* to put XP on it. :-) understanding you, or maybe not ? I'm not quite sure ... Regards, Rudy Wieser |
#16
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Does .mp4 - or any other video format - have a text field (comment, not subtitle)? If so, what can edit it?
Cross-posted to 4 newsgroups. Many netizens consider that excessive.
How is a broadcast newsgroup related to metadata in files? J. P. Gilliver (John) wrote: I like the comment field in the .jpg image format; if viewing an image in IrfanView, I just type I then C, and I can add comment text, that then actually becomes part of the file, thus surviving any renaming, zipping, even emailing. (I use it a lot in listing who's who in group photographs [I come across those a lot in genealogy], but general information about an image is useful.) [I _presume_ there are other image-handling softwares that can access/edit this field, though I don't know what they are; I'd be interested to know.] I'd like to have a similar facility for videos (I have mostly .mp4 format, but am interested for any format): _is_ there something intrinsic to the format? I'm not talking about a subtitle "track", or anything like that - just a comment field. And if there is, what software can access - and/or edit - it? At present, I'm reduced to either putting information into the filename, or keeping a text (or other, such as .doc - I only use that for the one or two places I want to e. g. include some Russian) file of the same name in the folder next to it. Both of which are unsatisfactory compared to an embedded text field. https://www.mp3tag.de/en/#formats Says it edits metadata in files, and lists .mp4 as a supported format. It's free, so you could try it without cost. https://videoconverter.wondershare.c...a-for-mp4.html That has a pic at step 2 showing what metadata fields can be edited for an MP4 video. Even if a graphics file format does not support metadata or comments, you could use steganography to encode your comments into the graphics file. Probably a lot more work than you care to perform, especially since you did not indicate the comments are secret. https://null-byte.wonderhowto.com/ho...conds-0180936/ |
#17
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Does .mp4 - or any other video format - have a text field(comment, not subtitle)? If so, what can edit it?
On 11/07/2018 10:11, R.Wieser wrote:
John Williamson, Grin (Deliberate misunderstanding) Replacing it with XP is a good start. Well, someone told me that Win7 is at least halfway decent. You don't *have* to put XP on it. :-) understanding you, or maybe not ? I'm not quite sure ... You understood me perfectly. Windows 7 comes as a good runner up to XP as the best operating system. (In my opinion, which is not shared by Linux devotees.) -- Tciao for Now! John. |
#18
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Does .mp4 - or any other video format - have a text field (comment, not subtitle)? If so, what can edit it?
In message , VanguardLH
writes: Cross-posted to 4 newsgroups. Many netizens consider that excessive. How is a broadcast newsgroup related to metadata in files? You are right, it was a bit excessive (though the '98 group is very quiet these days). The UTB 'group contains many who are knowledgeable about many things, including video formats. But yes, you are right. J. P. Gilliver (John) wrote: [] https://www.mp3tag.de/en/#formats Says it edits metadata in files, and lists .mp4 as a supported format. It's free, so you could try it without cost. Thanks, I may do so. https://videoconverter.wondershare.c...a-for-mp4.html That has a pic at step 2 showing what metadata fields can be edited for an MP4 video. Someone (I think Mayayana) has already produced chapter and verse on all the metadata fields. Someone else - I think it was Frank Slootweg - pointed out that VLC had a Comment field that could be edited, in a way so obvious that I hadn't spotted it; he also pointed out that .mp4 isn't anywhere near the whole story, and such a file may contain a variety of different things. Which I subsequently verified - some .mp4 files _could_ have something edited into the Comment field using VLC, and some couldn't (though in all cases no error or other indication was evident - just closing VLC and then reopening it on the files sometimes showed the comment had stuck and sometimes didn't). Even if a graphics file format does not support metadata or comments, you could use steganography to encode your comments into the graphics file. Probably a lot more work than you care to perform, especially since you did not indicate the comments are secret. https://null-byte.wonderhowto.com/ho...y-hide-secret- data-inside-image-audio-file-seconds-0180936/ (-:! No, nothing secret: just simple notes like "This was the first time they performed this programme, 1981 Richmond" (figure skating), or perhaps notes on who the composer and lyricist are/were (and maybe the lyrics) for a music video. -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf You cannot simply assume someone is honest just because they are not an MP. |
#19
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Does .mp4 - or any other video format - have a text field (comment, not subtitle)? If so, what can edit it?
"R.Wieser" wrote in message news John, that's not that different, to me, from storing a text file of the same name in the folder. The difference is that in the case of ADSes the filesystem maintains the connection (read: below OS level), and in the above you are the sole manager of it (the filesystem nor the OS is aware of any such linking). Interesting; I don't think any of the servers I use (with the possible exception of the Mozilla one) object to such headers. Well, AIOE did. It refused to accept the post until I removed that newsgroup ... though now I think of it, it *might* have been a simple "too many groups" problem. Lets see what happens when I remove windows7 instead. Regards, Rudy Wieser XVID .mp4 can be text edited in about 20 different fields, including copyright, subject and author with VirtualDub. |
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