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Comments (3)

AbySwifter avatar AbySwifter commented on May 22, 2024

最终,我通过如下方式解决了问题:
源代码:
AVAssetTrackResource.swift line:96

// MARK: - NSCopying
    override public func copy(with zone: NSZone? = nil) -> Any {
        let resource = super.copy(with: zone) as! AVAssetTrackResource
        resource.asset = asset
        return resource
    }

修改后的代码:

// MARK: - NSCopying
    override public func copy(with zone: NSZone? = nil) -> Any {
        let resource = super.copy(with: zone) as! AVAssetTrackResource
        resource.asset = asset?.copy() as? AVAsset
        resource.scaledDuration = CMTime.invalid
        return resource
    }

from cabbage.

AbySwifter avatar AbySwifter commented on May 22, 2024

这里的疑问是关于resource.scaledDuration属性,何时应该将其值赋为 invalid?

from cabbage.

vitoziv avatar vitoziv commented on May 22, 2024

如果期望视频选择时间就是时间线上的时间那么 resource.scaledDuration 就应该为 invalid。 如果视频选择的时间需要做变速效果就需要设置 scaledDuration。 如果设置了 scaledDuration 之后要记得已经设置了这个,无论之后视频选择了多少视频时间都会变成 scaledDuration,所以要同步修改选择时间和 scaledDuration。看业务需求

from cabbage.

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