Sorry, I’m not sure whether this is a topic for Stack Overflow, but I give it a try.
In MP4 Metadata, what is the best place to store Artist and Title of Background music ?
It is obvious that for normal music videos, one would use the standard Artist and Title tags, but I’m talking about background music for self-made videos, e.g. if I have a video of my grandson’s judo-training, and I use a renderer to add an extra audiotrack, e.g. half-a-minute of ‘Help’ by The Beatles, or some own piano or guitarmusic, I want to document that music, but not in the standard tags, because there are quite a few viewers that only show the standard tags for Artist and Title (and sort on them), but they then do not show the normal filename :-(
Thanks for any suggestion.
P.S. Just for info, and it is not relevant for my question, but for the time being I use Mp3tag.exe (yes, it works very easy for MP4 files as well) to write the Artist and Title info and I use jsmediatags to read the tags, and it’s an awesome program, so thank you António Afonso
I don't think there is any tag specially designed for this purpose. The best bet would probably be to add it as another line in the Description.
For example
Video of my grandson Johnny on June 22, 1984, at the Cobra Kai studio in Encino
Background music is "Help" by The Beatles
Related
I have a strange problem with MP4 tagging.. I can figure out 2 styles of tags, one that works with mp3tag and tagscanner, another that works with MusicBee.. But I can't figure out one that universally works with all of those. So I write 2 sets of tags into the file...
and even this isn't enough.. Players like AIMP and Clementine still can't read MP4 files I tagged this way. I need to open mp3tag load my files and save them.. then it will write tags that those music players understand.. but I can't find good documentation anywhere.
Does anyone know what kind of tags I need to write to make all of them be able to read the tags? I tried to look mp4s that work in all of them and it is no use, I see tags like "Artist".. I already write a tag called "Artist".. I mean it looks like "Artist" in exif also, this is the tag that I wrote that MusicBee understands.
I use the AudioGenie Windows Library to write the tags. There are 2 different methods for writing a tag.. one is called an ISLT text frame (which I have no idea what that is) and requires an integer code as well as text when writing. Another is called an iTune text frame and requires a string frame ID as well as text.
I tried to shove MP3 ID3v2 tags in both of those as well, to see if that was what the third group of players that can't read my tags wanted. But that didn't work. I only tried this because I read somewhere that ID3v2 tags are widely used in MP4 files (it was only on one comment in stackoverflow that I read this, so I'm skeptical)
Could someone point me in the right direction?
I'm playing around with a .mp3 file and I'd like to imbed some code that prompts the listener for information (i was thinking a javascript popup) when the file is played. I've been reading up on ID3 tags and there seems to be some neat functionality built into the 'Audio Encryption' or possibly into the 'Generate Encapsulate Object' frames, but I cannot seem to find any good examples. I am assuming that if the tags can contain links I should be able to collect some data when the file is played.
No, ID3 in general does not support this. Only ID3v2, i.e. in versions 2.3.0 and 2.4.0 you could use
a WXXX frame, see https://id3.org/id3v2.3.0#User_defined_URL_link_frame while
a GEOB frame you might mean is more like an attachment for files, see https://id3.org/id3v2.3.0#General_encapsulated_object
How you're able to extract frames (let alone ID3v2 in general) out of an MP3 file with JavaScript is another problem.
I need a tool to programmatically convert epub files to a series of images. The output should look like screenshots taken on a canonical device (for this application, an iPad). I haven't been able to find any tools that do something like this.
So what I'd really like (1) is a tool that does that. But assuming that I'm correct that no such tool exists, is there (2) a library (preferably a Perl module, but I'm not that picky) that will read and render ePub?
Obviously, rolling my own I could combine tools for unzipping, reading html, reading xml, putting everything in the right order, and rendering html within certain constraints. Though I'd rather not do that, and if that's the only option I'll have to go on to look for a tool that will do the last part of that or I'll have to create that too.
Any leads on (1), or failing that (2)?
Apologies if what I'm about to type is just crazy-talk on my part--in fact, I'm pretty sure it is--but perhaps something like this might work and I'm kind of interested in knowing how well it might work for you:
Use Frank (https://github.com/moredip/Frank) to control the iOS Simulator on a Mac. Program it to open up the EPUB docs you need.
All you need then is something to automate the taking of the screen shots. Obviously, these will look like the EPUBs are being rendered in an iPad (or an iPhone if you wish--the iOS Simulator does both, of course).
Automating the screenshots can probably be done with AppleScript, although the hard part might be getting it to talk to Frank. Worst case, you can tell Frank to pause for 5 seconds after it loads each page and tell AppleScript to take a screen shot every five seconds. That sucks, but if you're desperate, it will get it done. It's also possible Frank can somehow make the screenshots happen--I haven't used it enough to know.
Pandoc can convert from EPub to LaTeX (and therefore to PDF) or to any number of other formats. Conceptually this should be a type (1) solution.
depends on your definition of "look like" - do you want the user-chrome or just the epub rendering for a given screen size.
I would check out the various epub readers for your platform of choice, size the window to your preferred dimensions, and then just "print" the epub to a virtual printer that outputs to image files - on windoze I use imageprint.
You could easily make a "frame" from an iPad product shot and place your screenshots within that - only thing missing would be as I said the user chrome.
I have seen some tutorials on the subject, but they all go half into it and then leave a person wondering.
How can I stream an rss feed into an iphone app.
I know the xml should be read in, parsed etc.
But then I am not sure how to display the information I need like, images, embedded videos etc.
If someone could just point me in the right direction I would be extremely grateful.
Thanks in advance
First, you need some type of XML parser. You can use the built in NSXMLParser or a slew of other parsers that you will need to download. Each have their pros/cons depending on what type of reading/writing you will be doing with your RSS feed.
To display the data, I would recommend a tableView. You can create custom UITablvewCells for each cell to hold the data however you want to display it. There are several tutorials available for that if you want to Google for it.
As for data, read all the RSS data into an array you create and have the tableView access that array.
Again, there are many online tutorials for this already but it seems like you need help with displaying the data. A quick Google lookup for how to create custom UITableViewCells should provide you lots of helpful links. Good luck.
Does anyone know of a good explanation of EXIF key names? I am writing a photo organizer and want to get as much information as possible out of the photo as I can.
However, the EXIF key names are not very helpful. For example, from what I can tell (by exporting images from iPhoto)
album or set name is stored as 'fixture_identifier'
tags or keywords are stored as either 'keywords' or 'subject'
And so on.
Anyone have some valuable insight in this area?
Here is a list of EXIF tags:
https://sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
Thing is that you cannot be sure of what a camera or application will put in each, so you'll have to create code to handle those corner cases (where tags or keywords are in either keywords or subject).
Also, there are maker specific tags, as you can see in the tag id 0x927c, which you should also handle specifically.
All listed here:
http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif.html
The exiv2 library has a list of EXIF tags, see http://www.exiv2.org/tags.html