Question

我使用以下代码从存储到数组中的一系列图像中创建视频（takenImages）。持续时间是以秒为单位的帧持续时间。

然后将所有内容保存到库中。

我的问题是，如果我运行调试器，视频会完美保存，但如果我在没有调试器的情况下运行，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);
        }

    }

这是运行后我在控制台中所拥有的一个示例（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？

提前多多感谢。

再见
托马索

Answer 1

在设置缓冲区时尝试此操作。

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

Answer 2

writerInput.expectsMediaDataInRealTime = YES;

Answer 3

在writerInput对象上使用requestMediaDataWhenReadyOnQueue:usingBlock:更合适。当它准备再次输入时，它将再次调用该块。

Answer 4

尝试在循环内的代码上使用@autoreleasepool。这将释放每个循环中未使用的内存，而不是释放所有内存，直到循环结束。

avfoundation：appendPixelBuffer withPresentationTime，适配器未就绪

4 个答案: