如何使用 MPMoviePlayerController 或 AVPlayer 在 iOS 上播放没有文件扩展名的电影文件？

Question

I want to play a movie in iOS 4.3 on the iPad. I've successfully used MPMoviePlayerController and AVPlayer to load files from a remote URL when the filename has a file extension. However, when I use a CDN that doesn't return the filename (just an un-guessable random name), neither MPMoviePlayerController or AVPlayer seem to be able to cope.

Is there a way to tell either player that it really is a movie of type x and it should just get on playing it?

MPMoviePlayerController will return the following error from it's changed state notification:

{
    MPMoviePlayerPlaybackDidFinishReasonUserInfoKey = 1;
    error = "Error Domain=MediaPlayerErrorDomain Code=-12847 \"This movie format is not supported.\" UserInfo=0x5b60030 {NSLocalizedDescription=This movie format is not supported.}";
}

I know that file is a valid m4v file, as when I rename it all is fine.

Answer 1

File at tmp

NSString* _filePath

Create symlink

NSFileManager *filemgr = [NSFileManager defaultManager];
NSString *slink = [_filePath stringByAppendingPathExtension:@"m4v"];
if (![filemgr fileExistsAtPath:slink]) {
    NSError *error = nil;
    [filemgr createSymbolicLinkAtPath:[_filePath stringByAppendingPathExtension:@"m4v"] withDestinationPath: _filePath error: &error];
    if (error) {
        ...
    }
}
...

play video by

Answer 2

If the player can't guess the file format you need to check that the CDN sends the right mime type back. My guess is that your CDN can't guess the mimetype correctly nor can the player.

In most cases this is due to how the CDN presents the HTTP header. Check that the "Content-Type" header is set to a video format matching your content.

Answer 3

WebKit handle this by a Private AVURLAsset option: AVURLAssetOutOfBandMIMETypeKey , this option is used when you specify a MIME type in the HTML's video tag,

You can use this option like:

NSString * mimeType = @"video/mp4";

// or even with codecs
mimeType = @"video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"";

// create asset
AVURLAsset * asset = [[AVURLAsset alloc] initWithURL:url options:@{@"AVURLAssetOutOfBandMIMETypeKey": mimeType}];

// create AVPlayer with AVURLAsset
AVPlayer * player = [AVPlayer playerWithPlayerItem:[AVPlayerItem playerItemWithAsset:asset]];

Since it is a private key, you may want to obfuscate it if you plan to submit it to AppStore.

The WebKit source can be found here: https://opensource.apple.com/source/WebCore/WebCore-7604.1.38.1.6/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm.auto.html

Answer 4

If you have problems to get the ContentType of your connection you could cycle through the playable MIME types and create symbolic links to the actual file with the extension and check if they are playable. Like so:

NSLog(@"linked path: %@",[videoURL absoluteString]);
NSString* linkedPath;
AVURLAsset* asset;
NSFileManager *filemgr = [NSFileManager defaultManager];

for (NSString* string in [AVURLAsset audiovisualMIMETypes]) {

    if ([string containsString:@"video/"]) {

        NSLog(@"Trying: %@",string);

        linkedPath = [[videoURL absoluteString] stringByAppendingPathExtension:[string stringByReplacingOccurrencesOfString:@"video/" withString:@""]];
        NSLog(@"linked path: %@",linkedPath);

        if (![filemgr fileExistsAtPath:linkedPath]) {
            NSError *error = nil;
            [filemgr createSymbolicLinkAtURL:[NSURL URLWithString:linkedPath] withDestinationURL:videoURL error:&error];
            if (error) {
               NSLog(@"error %@",error.localizedDescription);
            }
        }

       asset = [AVURLAsset assetWithURL:[NSURL URLWithString:linkedPath]];
        if ([asset isPlayable]) {
            NSLog(@"Playable");
            break;
        }else{
            NSLog(@"Not Playable");
            asset = nil;
        }
    }

}

Answer 5

iPhone support video H.264, MPEG-4 in .mp4, .m4v, .mov formats and audio files in AAC, MP3, M4a, Apple lossless and Audible. You can use NSFileManager's -contentsOfDirectoryAtPath:error: method to get an array with the contents of a directory (as strings).Then you just do strings operations .

Answer 6

Dylan is correct.

Both MPMoviePlayer and AVPlayer needs a file extension in order to play the file from URL otherwise an error message will be shown. Better to use some kind of tricks.

Answer 7

Finally, I found the answer.

You should use AVURLAsset (the subclass of AVAsset) and set the MIMEType in the options input :

let mimeType = "video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\""
let urlAsset = AVURLAsset(url: url, options["AVURLAssetOutOfBandMIMETypeKey": mimeType])

Source -> https://stackoverflow.com/a/54087143/6736184

Answer 8

It's sort of a hack, but what you could do is run each name through a method that checks for a period with three characters after it. If not, just append .m4v automatically. Or get the MIME type and append an extension automatically based on the returned type. If available. Look up documentation with NSString for more info. Good luck! Let me know if that helped.