android – 使用MediaCodec截断视频

我用 Android MediaCodec库来转码视频文件(主要是改变分辨率 Sample code here)

我想要实现的另一件事是截断视频 – 仅开始15秒.逻辑是检查videoExtractor.getSampleTime()是否大于15秒,我只是将EOS写入解码器缓冲区.

但我得到一个异常引起：android.media.MediaCodec $CodecException：Error 0xfffffff3

这是我的代码：

while ((!videoEncoderDonE) || (!audioEncoderDonE)) {
        while (!videoExtractorDone
                && (encoderOutputVideoFormat == null || muxing)) {
            int decoderInputBufferIndex = videoDecoder.dequeueInputBuffer(TIMEOUT_USEC);
            if (decoderInputBufferIndex == MediaCodec.INFO_TRY_AGAIN_LATER)
                break;

            ByteBuffer decoderInputBuffer = videoDecoderInputBuffers[decoderInputBufferIndex];
            int size = videoExtractor.readSampleData(decoderInputBuffer,0);
            long presentationTime = videoExtractor.getSampleTime();

            if (size >= 0) {
                videoDecoder.queueInputBuffer(
                        decoderInputBufferIndex,size,presentationTime,videoExtractor.getSampleFlags());
            }
            videoExtractorDone = !videoExtractor.advance();

            if (!videoExtractorDone && videoExtractor.getSampleTime() > mVideoDurationLimit * 1000000) {
                videoExtractorDone = true;
            }

            if (videoExtractorDonE)
                videoDecoder.queueInputBuffer(decoderInputBufferIndex,MediaCodec.bUFFER_FLAG_END_OF_STREAM);
            break;
        }

完整的源代码可以在here找到.