将问题标记为过时,因为使用已弃用的 avcodec_decode_video2
I'm currently experiencing artifacts when decoding video using ffmpegs api. On what I would assume to be intermediate frames, artifacts build slowly only from active movement in the frame. These artifacts build for 50-100 frames until I assume a keyframe resets them. Frames are then decoded correctly and the artifacts proceed to build again.
困扰我的一件事是我有一些 30fps(h264) 的视频样本可以正常工作,但我所有的 60fps 视频(h264) 都遇到这个问题。
我目前没有足够的声誉来发布图像,所以希望这个链接能够工作。https://i.stack.imgur.com/1bv4X.jpg
int numBytes;
int frameFinished;
AVFrame* decodedRawFrame;
AVFrame* rgbFrame;
//Enum class for decoding results, used to break decode loop when a frame is gathered
DecodeResult retResult = DecodeResult::Fail;
decodedRawFrame = av_frame_alloc();
rgbFrame = av_frame_alloc();
if (!decodedRawFrame) {
fprintf(stderr, "Could not allocate video frame\n");
return DecodeResult::Fail;
}
numBytes = avpicture_get_size(PIX_FMT_RGBA, mCodecCtx->width,mCodecCtx->height);
uint8_t* buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
avpicture_fill((AVPicture *) rgbFrame, buffer, PIX_FMT_RGBA, mCodecCtx->width, mCodecCtx->height);
AVPacket packet;
while(av_read_frame(mFormatCtx, &packet) >= 0 && retResult != DecodeResult::Success)
{
// Is this a packet from the video stream?
if (packet.stream_index == mVideoStreamIndex)
{
// Decode video frame
int decodeValue = avcodec_decode_video2(mCodecCtx, decodedRawFrame, &frameFinished, &packet);
// Did we get a video frame?
if (frameFinished)// && rgbFrame->pict_type != AV_PICTURE_TYPE_NONE )
{
// Convert the image from its native format to RGB
int SwsFlags = SWS_BILINEAR;
// Accurate round clears up a problem where the start
// of videos have green bars on them
SwsFlags |= SWS_ACCURATE_RND;
struct SwsContext *ctx = sws_getCachedContext(NULL, mCodecCtx->width, mCodecCtx->height, mCodecCtx->pix_fmt, mCodecCtx->width, mCodecCtx->height,
PIX_FMT_RGBA, SwsFlags, NULL, NULL, NULL);
sws_scale(ctx, decodedRawFrame->data, decodedRawFrame->linesize, 0, mCodecCtx->height, rgbFrame->data, rgbFrame->linesize);
//if(count%5 == 0 && count < 105)
// DebugSavePPMImage(rgbFrame, mCodecCtx->width, mCodecCtx->height, count);
++count;
// Viewable frame is a struct to hold buffer and frame together in a queue
ViewableFrame frame;
frame.buffer = buffer;
frame.frame = rgbFrame;
mFrameQueue.push(frame);
retResult = DecodeResult::Success;
sws_freeContext(ctx);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
// Check for end of file leftover frames
if(retResult != DecodeResult::Success)
{
int result = av_read_frame(mFormatCtx, &packet);
if(result < 0)
isEoF = true;
av_free_packet(&packet);
}
// Free the YUV frame
av_frame_free(&decodedRawFrame);
我正在尝试构建一个解码帧队列,然后根据需要使用和释放该队列。我对帧的分离是否导致中间帧解码不正确?一旦我成功收集了一帧,我也会打破解码循环(解码::成功,我见过的大多数例子都倾向于循环整个视频。
所有编解码器连接、视频流信息和格式上下文的设置与主函数中所示完全相同https://github.com/chelyaev/ffmpeg-tutorial/blob/master/tutorial01.c
任何建议将不胜感激。