avfoundation:appendPixelBuffer withPresentationTime,适配器未就绪

Question

我使用以下代码从存储到数组中的一系列图像创建视频(takenImages).持续时间是帧持续时间(秒).

然后一切都保存到图书馆.

我的问题是,如果我运行调试器,视频会保存完好,但如果我没有调试器运行,视频就不会完全保存(只保存了第一帧).

int timescale = duration * [takenImages count];

    for (int i = 0; i < [takenImages count]; i++) {
        CVPixelBufferRef buffer = NULL;

        buffer = [self pixelBufferFromCGImage:[[takenImages objectAtIndex:i] CGImage]];

        BOOL append_ok = NO;
        int j = 0;
        while (!append_ok && j < 30) {
            if (adaptor.assetWriterInput.readyForMoreMediaData) {
                printf("appending %d attemp %d\n", i, j);
                append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:CMTimeMake(i*duration,timescale)];
            } else {
                printf("adaptor not ready %d, %d\n", i, j);
                [NSThread sleepForTimeInterval:0.1];
            }
            j++;
        }

        if (!append_ok) {
            printf("error appending image %d times %d\n", i, j);
        }

    }

这是我在运行后在控制台中拥有的一个示例(调试器关闭):

appending 0 attemp 0
appending 1 attemp 0
adaptor not ready 2, 0
adaptor not ready 2, 1
adaptor not ready 2, 2
adaptor not ready 2, 3
adaptor not ready 2, 4
adaptor not ready 2, 5
adaptor not ready 2, 6
adaptor not ready 2, 7
adaptor not ready 2, 8
adaptor not ready 2, 9
adaptor not ready 2, 10
adaptor not ready 2, 11
adaptor not ready 2, 12
adaptor not ready 2, 13
adaptor not ready 2, 14
adaptor not ready 2, 15
adaptor not ready 2, 16
adaptor not ready 2, 17
adaptor not ready 2, 18
adaptor not ready 2, 19
adaptor not ready 2, 20
adaptor not ready 2, 21
adaptor not ready 2, 22
adaptor not ready 2, 23
adaptor not ready 2, 24
adaptor not ready 2, 25
adaptor not ready 2, 26
adaptor not ready 2, 27
adaptor not ready 2, 28
adaptor not ready 2, 29
error appending image 2 times 30
adaptor not ready 3, 0
adaptor not ready 3, 1
adaptor not ready 3, 2
adaptor not ready 3, 3
adaptor not ready 3, 4
adaptor not ready 3, 5
adaptor not ready 3, 6
adaptor not ready 3, 7
adaptor not ready 3, 8
adaptor not ready 3, 9
adaptor not ready 3, 10
adaptor not ready 3, 11
adaptor not ready 3, 12
adaptor not ready 3, 13
adaptor not ready 3, 14
adaptor not ready 3, 15
adaptor not ready 3, 16
adaptor not ready 3, 17
adaptor not ready 3, 18
adaptor not ready 3, 19
adaptor not ready 3, 20
adaptor not ready 3, 21
adaptor not ready 3, 22
adaptor not ready 3, 23
adaptor not ready 3, 24
adaptor not ready 3, 25
adaptor not ready 3, 26
adaptor not ready 3, 27
adaptor not ready 3, 28
adaptor not ready 3, 29
error appending image 3 times 30
adaptor not ready 4, 0
adaptor not ready 4, 1
adaptor not ready 4, 2
adaptor not ready 4, 3
adaptor not ready 4, 4
adaptor not ready 4, 5
adaptor not ready 4, 6
adaptor not ready 4, 7
adaptor not ready 4, 8
adaptor not ready 4, 9
adaptor not ready 4, 10
adaptor not ready 4, 11
adaptor not ready 4, 12
adaptor not ready 4, 13
adaptor not ready 4, 14
adaptor not ready 4, 15
adaptor not ready 4, 16
adaptor not ready 4, 17
adaptor not ready 4, 18
adaptor not ready 4, 19
adaptor not ready 4, 20
adaptor not ready 4, 21
adaptor not ready 4, 22
adaptor not ready 4, 23
adaptor not ready 4, 24
adaptor not ready 4, 25
adaptor not ready 4, 26
adaptor not ready 4, 27
adaptor not ready 4, 28
adaptor not ready 4, 29
error appending image 4 times 30

有什么建议吗？

非常感谢提前.

再见
托马索

Answer 1

设置缓冲区时尝试此操作.

[adaptor appendPixelBuffer:buffer withPresentationTime:presentTime];
if(buffer)
    CVBufferRelease(buffer);
[NSThread sleepForTimeInterval:0.05];