Use below code and might help you in solving your problem.
while (av_read_frame(refrenceFormatCtx, &packet) >= 0) {
if (packet.stream<http://packet.stream/>_index == video_stream_index) {
//packet is video
if (stream == NULL) { //create stream in file
stream = avformat_new_stream(output_ctx,
refrenceFormatCtx->streams[video_stream_index]->codec->codec);
avcodec_copy_context(stream->codec,
refrenceFormatCtx->streams[video_stream_index]->codec);
stream->sample_aspect_ratio =
refrenceFormatCtx->streams[video_stream_index]->codec->sample_aspect_ratio;
}
int check = 0;
packet.stream<http://packet.stream/>_index = stream->id;
int result = avcodec_decode_video2(codec_ctx, picture_yuv, &check, &packet);
av_free_packet(&packet);
av_packet_unref(&packet);
if(result <= 0 || check == 0){
continue;
}
if(initialize_rgb_requirements) {
sizeofrgbpicture = avpicture_get_size(AV_PIX_FMT_RGB24, codec_ctx->width,
codec_ctx->height);
picture_rgb = av_frame_alloc();
picture_buffer_rgb = (uint8_t*) (av_malloc(sizeofrgbpicture));
avpicture_fill((AVPicture *) picture_rgb, picture_buffer_rgb, AV_PIX_FMT_RGB24,
codec_ctx->width, codec_ctx->height);
img_convert_ctx = sws_getContext(codec_ctx->width, codec_ctx->height,
AV_PIX_FMT_YUV420P, codec_ctx->width, codec_ctx->height,AV_PIX_FMT_RGB24,
SWS_BICUBIC, NULL, NULL, NULL);
initialize_rgb_requirements=0;
}
int height = 0;
if(picture_yuv->data != NULL) {
height = sws_scale(img_convert_ctx, ((AVPicture*)picture_yuv)->data,
((AVPicture*)picture_yuv)->linesize, 0, codec_ctx->height,
((AVPicture*)picture_rgb)->data,((AVPicture*)picture_rgb)->linesize);
}
rgb_image_data = (uint8_t *)malloc(sizeofrgbpicture * sizeof(uint8_t));
int ret = avpicture_layout((AVPicture *)picture_rgb, AV_PIX_FMT_RGB24,
codec_ctx->width, codec_ctx->height, rgb_image_data, sizeofrgbpicture);
emit imageQueued(rgb_image_data, codec_ctx->width,codec_ctx->height);
}
}
Get Outlook for Android<https://aka.ms/ghei36>
________________________________
From: Libav-user <[email protected]> on behalf of Vasiliy Volkov
<[email protected]>
Sent: Wednesday, October 3, 2018 3:44:49 PM
To: [email protected]
Subject: Re: [Libav-user] [External] Questions about decoding broken streams
Well there is no anything unusual in our code. We're simply use this API:
https://ffmpeg.org/doxygen/4.0/group__lavc__encdec.html
avcodec_send_packet
avcodec_receive_frame
And for context we setup:
context->err_recognition = AV_EF_EXPLODE | AV_EF_BITSTREAM | AV_EF_BUFFER |
AV_EF_CAREFUL | AV_EF_COMPLIANT | AV_EF_AGGRESSIVE;
ср, 3 окт. 2018 г. в 12:58, Niraj Gandha
<[email protected]<mailto:[email protected]>>:
Hi Vasiliy,
Can you share the code in which you are decoding the stream?
Thanks,
Niraj Gandha
Get Outlook for Android<https://aka.ms/ghei36>
________________________________
From: Libav-user
<[email protected]<mailto:[email protected]>> on behalf
of Vasiliy Volkov <[email protected]<mailto:[email protected]>>
Sent: Wednesday, October 3, 2018 3:08:08 PM
To: [email protected]<mailto:[email protected]>
Subject: [External] [Libav-user] Questions about decoding broken streams
CAUTION: This email originated from outside of the organization. Do not click
links or open attachments unless you recognize the sender and know the content
is safe.
Hi,
I'm trying to deal with broken streams with libav. Sometimes streams can be
broken due to nature of incoming network channel (UDP multicast) but i'd like
to "fix them" as much as possible. I'm trying to fill broken frames with last
good decoded frame. There are situations when I can do such thing and
everything is ok but most of time it's not helping: libav tries to decode
broken stream and add some green frames (h264 decoding) which really catch your
eyes when you watch this stream after encoding.
Is it possible to change this color to black for example? Can libav while
decoding set some flags to frames and mark them as broken or "green"?
It will be helpful because next I'll can replace such frames with correctly
decoded which fix it.
Thanks
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