3gp或者mp4文件的duration长度为0，在SampleIterator::seekTo函数返回错误码-1007

如果3gp或者mp4文件的duration长度为0，则会在SampleIterator::seekTo函数返回错误码-1007，即ERROR_MALFORMED错误。

if (mTable->mSampleToChunkOffset < 0

|| mTable->mChunkOffsetOffset < 0
|| mTable->mSampleSizeOffset < 0
|| mTable->mTimeToSampleCount == 0) {
return ERROR_MALFORMED;

}

调用关系为：

1. MPEG4Extractor类的read函数调用SampleTable类的getMetaDataForSample函数，

status_t err =
mSampleTable->getMetaDataForSample(
mCurrentSampleIndex, &offset, &size, &dts, &isSyncSample);

2.SampleTable类的getMetaDataForSample函数调用SampleIterator类的seekTo函数

status_t err;
if ((err = mSampleIterator->seekTo(sampleIndex)) != OK) {
return err;
}

3.SampleIterator类的seekTo函数返回ERROR_MALFORMED错误

if (mTable->mSampleToChunkOffset < 0

|| mTable->mChunkOffsetOffset < 0
|| mTable->mSampleSizeOffset < 0
|| mTable->mTimeToSampleCount == 0) {
return ERROR_MALFORMED;

}