iosavfoundationavplayeravassetimagegenerator

m3u8 file AVAssetImageGenerator error

I am using AVPlayer to play .m3u8 file. Using AVAssetImageGenerator to extract image out of it using following code :

AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:mp.contentURL options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
img = [[UIImage alloc] initWithCGImage:oneRef];

It always gives me error :

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x7fb4e30cbfa0 {NSUnderlyingError=0x7fb4e0e28530 "The operation couldn’t be completed. (OSStatus error -12782.)", NSLocalizedFailureReason=An unknown error occurred (-12782), NSLocalizedDescription=The operation could not be completed}

It works for mp4,mov and all major video extensions URL but not for m3u8. Any idea??

Solution

  • You won't be able to get still images for a live stream using AVAssetImageGenerator. Instead, you can use

    AVPlayerItemVideoOutput

    With AVPlayerItemVideoOutput you can get an image that is appropriate to display at a specified time for a given .m3u8 stream using the following method: - (CVPixelBufferRef)copyPixelBufferForItemTime:(CMTime)itemTime itemTimeForDisplay:(CMTime *)outItemTimeForDisplay Then, you can convert the returned CVPixelBufferRef into an image (or other) for display.