iOS AVPlayer slow down

问题:

I am using AVPlayer to play online video in my project. The Video is playing well. Now I want to reduce /increase the fps of the video . Below is my code that I am using:

self.asset = [AVAsset assetWithURL:self.videoUrl];
// the video player
self.player = [AVPlayer playerWithURL:self.videoUrl];
self.player.actionAtItemEnd = AVPlayerActionAtItemEndNone;

self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
self.playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(playerItemDidReachEnd:)
                                             name:AVPlayerItemDidPlayToEndTimeNotification
                                           object:[self.player currentItem]];


self.playerLayer.frame = CGRectMake(0, 0, self.view.frame.size.width, self.myPlayerView.frame.size.height);
[self.myPlayerView.layer addSublayer:self.playerLayer];

- (void)playerItemDidReachEnd:(NSNotification *)notification {
    AVPlayerItem *p = [notification object];
    [p seekToTime:kCMTimeZero];
}

Now how should I reduce/increase the fps for the online video?

回答1:

You can do something like,

 -(float)getFrameRateFromAVPlayer
{
   float fps=0.00;
   if (self.queuePlayer.currentItem.asset) {
     AVAssetTrack * videoATrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] lastObject];
if(videoATrack)
{
    fps = videoATrack.nominalFrameRate;
  }
   }
    return fps;
}

OR

AVPlayerItem *item = AVPlayer.currentItem; // Your current item
float fps = 0.00;
for (AVPlayerItemTrack *track in item.tracks) {
if ([track.assetTrack.mediaType isEqualToString:AVMediaTypeVideo]) {
    fps = track.currentVideoFrameRate;
}
}

Hope this will help :)

回答2:

AVPlayer allows you to set the current rate of the playback. Basically, it accepts a range of possibility values to control the current AVPlayerItem such as play slow forward, fast forward or reverse with negative rates. As saying in the document, you should check whether or not the current item can support those states of playing

Please try to check it out. The link for your reference https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVPlayer_Class/index.html#//apple_ref/occ/instp/AVPlayer/rate