压缩后出现黑屏，只有声音

[HobaoKing]

使用手机录制，压缩后黑屏

[lihaojie]

我也遇到了、

[breezewind-yang]

有解决方案吗

[xiaogehenjimo]

有解决方法吗 @breezewind-yang @lihaojie @HobaoKing

[sheodon]

• (CGAffineTransform)transformFromDegress:(float)degress natureSize:(CGSize)natureSize{
  /** 矩阵校正 */
  // x = ax1 + cy1 + tx,y = bx1 + dy2 + ty
  if (degress == 90) {
  return CGAffineTransformMake(0, 1, -1, 0, natureSize.height, 0);
  }else if (degress == 180){
  return CGAffineTransformMake(-1, 0, 0, -1, natureSize.width , natureSize .height);
  }else if (degress == 270){
  return CGAffineTransformMake(0, -1, 1, 0, 0, natureSize.width); //视频压缩/合成出现黑屏现象
  // return CGAffineTransformMake(0, -1, 1, 0, -natureSize.height, 2 * natureSize.width);
  }else{
  return CGAffineTransformIdentity;
  }
  }