AVPlayer Video SeekToTime

问题

I'm using AVPlayer for play my video using slider and Some Buttons. Here is my methods for moving forward and backward using buttons.

-(IBAction)MoveForward
{
    //int value = timeSlider.value*36000 + 10;
    //CMTime newTime = CMTimeMakeWithSeconds(value, playspeed);
    //CMTime newTime = CMTimeMake(value,(playspeed*timeSlider.maximumValue));

    CMTime newTime = CMTimeMakeWithSeconds(timeSlider.value, playspeed);
    newTime.value += 60;
    [player seekToTime: newTime];
}

-(IBAction)MoveBackward
{
    CMTime newTime = CMTimeMakeWithSeconds(timeSlider.value-1, playspeed);
    [player seekToTime: newTime];
}

My Problem on this is the time to Seek is not working properly. That navigate to next frame based on seconds. I need to move next frame minutely. Help me...

回答1:

I don't really understand your code, you don't really need separate methods to move forwards and backwards, you can use the same one for both. I've got a working AVPlayer Movie Player, I'll show you how I did the slider part.

    -(IBAction)sliding:(id)sender{

        CMTime newTime = CMTimeMakeWithSeconds(seeker.value, 1);
        [self.player seekToTime:newTime];
     }

    -(void)setSlider{

        sliderTimer = [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self    selector:@selector(updateSlider) userInfo:nil repeats:YES]retain];
        self.seeker.maximumValue = [self durationInSeconds];
        [seeker addTarget:self action:@selector(sliding:) forControlEvents:UIControlEventValueChanged];
        seeker.minimumValue = 0.0;
        seeker.continuous = YES;  
    }

    - (void)updateSlider {

        self.seeker.maximumValue = [self durationInSeconds];
        self.seeker.value = [self currentTimeInSeconds];
    }

    - (Float64)durationInSeconds {
            Float64 dur = CMTimeGetSeconds(duration);
        return dur;
    }


    - (Float64)currentTimeInSeconds {
            Float64 dur = CMTimeGetSeconds([self.player currentTime]);
        return dur;
      }

And that's it, there are two gotchas in this code, first, the duration property returns a CMTime variable, you have to convert it to a float, also, this returns the raw number of seconds, you have to convert it to h:mm:ss if you want to display time labels. Second, the updateSlider method is triggered by a timer every second. Good Luck.

回答2:

The following snippet of code worked for me:

CMTime videoLength = self.mPlayer.currentItem.asset.duration;  // Gets the video duration
float videoLengthInSeconds = videoLength.value/videoLength.timescale; // Transfers the CMTime duration into seconds

[self.mPlayer seekToTime:CMTimeMakeWithSeconds(videoLengthInSeconds * [slider value], 1) 
                   completionHandler:^(BOOL finished) 
            {
                dispatch_async(dispatch_get_main_queue(), ^{
                    isSeeking = NO;
                    // Do some stuff
                });
            }];

来源：https://stackoverflow.com/questions/6329706/avplayer-video-seektotime