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  • can write frames to rtsp server, but can't display them in the ffplay or live555 client

    11 octobre 2016, par tankyx

    I am working on a zero latency streaming server, using ffmpeg libraries and I am facing a problem.
    My server is working when using nvenc, I can streaming successfully to my client, which is another computer on LAN. But if I change my encoder to use the libx264 (in order to reduce the latency), the server still write the frames, but the client is facing problems with the sdp header, and more specifically, the media subsession does not seem to be initialized. Therefore, the client crashes.

    The thing is, when I dump the sdp header when using nvenc and libx264, it is actually the same in both case.

    Here is the code I have done to initialize my encoder :

    /*
    
    Init the codec that is used to encode the video.
    
    Init the output format context (aka RTSP uri).
    
*/
    
FfmpegEncoder::FfmpegEncoder(char *url)
    
{
    
    AVRational      tmp_time_base;
    
    AVDictionary*   options = NULL;
    

    
    this->pCodec = avcodec_find_encoder_by_name("libx264");
    
    if (this->pCodec == NULL)
    
        throw myExceptions("Error: Can't initialize the encoder. FfmpegEncoder.cpp l:9\n");
    

    
    this->pCodecCtx = avcodec_alloc_context3(this->pCodec);
    

    
    //Alloc output context
    
    if (avformat_alloc_output_context2(&outFormatCtx, NULL, "rtsp", url) < 0)
    
        throw myExceptions("Error: Can't alloc stream output. FfmpegEncoder.cpp l:17\n");
    

    
    this->st = avformat_new_stream(this->outFormatCtx, this->pCodec);
    
    this->st->id = this->outFormatCtx->nb_streams - 1;
    

    
    if (this->st == NULL)
    
        throw myExceptions("Error: Can't create stream . FfmpegEncoder.cpp l:22\n");
    

    
    //Define the framerate of the output. The numerator should stay 1. Denumerator is the framerate we are aiming for.
    

    
    tmp_time_base.num = 1;
    
    tmp_time_base.den = 60;
    

    
    //TODO : parse these values
    
    this->pCodecCtx->bit_rate = 5000000;
    
    this->pCodecCtx->width = 1280;
    
    this->pCodecCtx->height = 720;
    
    //This set the fps. 60fps at this point.
    
    this->pCodecCtx->time_base = tmp_time_base;
    
    this->st->time_base = tmp_time_base;
    
    //Add a intra frame every 12 frames
    
    this->pCodecCtx->gop_size = 10;
    
    this->pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
    

    
    av_opt_set(this->pCodecCtx, "tune", "zerolatency", 0);
    
    av_opt_set(this->pCodecCtx, "vprofile", "main", 0);
    
    av_opt_set(this->pCodecCtx, "preset", "faster", 0);
    

    
    //Open Codec, using the context + x264 options
    
    if (avcodec_open2(this->pCodecCtx, this->pCodec, &options) < 0)
    
        throw myExceptions("Error: Can't open the codec. FfmpegEncoder.cpp l:43\n");
    

    
    if (avcodec_copy_context(this->st->codec, this->pCodecCtx) != 0) {
    
        throw myExceptions("Error : Can't copy codec context. FfmpegEncoder.cpp : l.46");
    
    }
    
    av_dump_format(this->outFormatCtx, 0, url, 1);
    

    
    //write the header needed to start the stream.
    
    if (avformat_write_header(this->outFormatCtx, NULL) != 0)
    
        throw myExceptions("Error: failed to connect to RTSP server. FfmpegEncoder.cpp l:48\n");
    
}

  • can write frames to rtsp server, but can't display them in the ffplay or live555 client

    11 octobre 2016, par tankyx

    I am working on a zero latency streaming server, using ffmpeg libraries and I am facing a problem.
    My server is working when using nvenc, I can streaming successfully to my client, which is another computer on LAN. But if I change my encoder to use the libx264 (in order to reduce the latency), the server still write the frames, but the client is facing problems with the sdp header, and more specifically, the media subsession does not seem to be initialized. Therefore, the client crashes.

    The thing is, when I dump the sdp header when using nvenc and libx264, it is actually the same in both case.

    Here is the code I have done to initialize my encoder :

    /*
    
    Init the codec that is used to encode the video.
    
    Init the output format context (aka RTSP uri).
    
*/
    
FfmpegEncoder::FfmpegEncoder(char *url)
    
{
    
    AVRational      tmp_time_base;
    
    AVDictionary*   options = NULL;
    

    
    this->pCodec = avcodec_find_encoder_by_name("libx264");
    
    if (this->pCodec == NULL)
    
        throw myExceptions("Error: Can't initialize the encoder. FfmpegEncoder.cpp l:9\n");
    

    
    this->pCodecCtx = avcodec_alloc_context3(this->pCodec);
    

    
    //Alloc output context
    
    if (avformat_alloc_output_context2(&outFormatCtx, NULL, "rtsp", url) < 0)
    
        throw myExceptions("Error: Can't alloc stream output. FfmpegEncoder.cpp l:17\n");
    

    
    this->st = avformat_new_stream(this->outFormatCtx, this->pCodec);
    
    this->st->id = this->outFormatCtx->nb_streams - 1;
    

    
    if (this->st == NULL)
    
        throw myExceptions("Error: Can't create stream . FfmpegEncoder.cpp l:22\n");
    

    
    //Define the framerate of the output. The numerator should stay 1. Denumerator is the framerate we are aiming for.
    

    
    tmp_time_base.num = 1;
    
    tmp_time_base.den = 60;
    

    
    //TODO : parse these values
    
    this->pCodecCtx->bit_rate = 5000000;
    
    this->pCodecCtx->width = 1280;
    
    this->pCodecCtx->height = 720;
    
    //This set the fps. 60fps at this point.
    
    this->pCodecCtx->time_base = tmp_time_base;
    
    this->st->time_base = tmp_time_base;
    
    //Add a intra frame every 12 frames
    
    this->pCodecCtx->gop_size = 10;
    
    this->pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
    

    
    av_opt_set(this->pCodecCtx, "tune", "zerolatency", 0);
    
    av_opt_set(this->pCodecCtx, "vprofile", "main", 0);
    
    av_opt_set(this->pCodecCtx, "preset", "faster", 0);
    

    
    //Open Codec, using the context + x264 options
    
    if (avcodec_open2(this->pCodecCtx, this->pCodec, &options) < 0)
    
        throw myExceptions("Error: Can't open the codec. FfmpegEncoder.cpp l:43\n");
    

    
    if (avcodec_copy_context(this->st->codec, this->pCodecCtx) != 0) {
    
        throw myExceptions("Error : Can't copy codec context. FfmpegEncoder.cpp : l.46");
    
    }
    
    av_dump_format(this->outFormatCtx, 0, url, 1);
    

    
    //write the header needed to start the stream.
    
    if (avformat_write_header(this->outFormatCtx, NULL) != 0)
    
        throw myExceptions("Error: failed to connect to RTSP server. FfmpegEncoder.cpp l:48\n");
    
}

  • Segfault while trying to fill the yuv image for rtsp streaming

    21 septembre 2016, par tankyx

    I am capturing the video stream from a window, and I want to restream it to my rtsp proxy server. However, it seems I can’t write the frame properly, but I can show the said frame in a SDL window. Here is my code :

    int StreamHandler::storeStreamData()
    
{
    
// Allocate video frame
    
pFrame = av_frame_alloc();
    

    
// Allocate an AVFrame structure
    
pFrameRGB = av_frame_alloc();
    
if (pFrameRGB == NULL)
    
    throw myExceptions("Error : Can't alloc the frame.");
    

    
// Determine required buffer size and allocate buffer
    
numBytes = avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width,
    
    pCodecCtx->height);
    
buffer = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t));
    

    
// Assign appropriate parts of buffer to image planes in pFrameRGB
    
avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_YUV420P,
    
    pCodecCtx->width, pCodecCtx->height);
    

    
//InitSdlDrawBack();
    

    
// initialize SWS context for software scaling
    

    
sws_ctx = sws_getContext(pCodecCtx->width,
    
    pCodecCtx->height,
    
    pCodecCtx->pix_fmt,
    
    pCodecCtx->width,
    
    pCodecCtx->height,
    
    pCodecCtx->pix_fmt,
    
    SWS_LANCZOS,
    
    NULL,
    
    NULL,
    
    NULL
    
);
    

    
SetPixelArray();
    
FfmpegEncoder enc("rtsp://127.0.0.1:1935/live/myStream");
    

    
i = 0;
    
while (av_read_frame(pFormatCtx, &packet) >= 0) {
    
    if (packet.stream_index == videoindex) {
    
        // Decode video frame
    
        avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
    
        if (frameFinished) {
    
            i++;
    
            //DrawFrame();
    

    
            sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data,
    
                pFrame->linesize, 0, pCodecCtx->height,
    
                pFrameRGB->data, pFrameRGB->linesize);
    
            enc.encodeFrame(pFrameRGB, i);
    
        }
    
    }
    
    // Free the packet that was allocated by av_read_frame
    
    av_free_packet(&packet);
    
}
    
// Free the RGB image
    
av_free(buffer);
    
av_frame_free(&pFrameRGB);
    

    
// Free the YUV frame
    
av_frame_free(&pFrame);
    

    
// Close the codecs
    
avcodec_close(pCodecCtx);
    
avcodec_close(pCodecCtxOrig);
    

    
// Close the video file
    
avformat_close_input(&pFormatCtx);
    

    
return 0;
    
}
    

    
void StreamHandler::SetPixelArray()
    
{
    
yPlaneSz = pCodecCtx->width * pCodecCtx->height;
    
uvPlaneSz = pCodecCtx->width * pCodecCtx->height / 4;
    
yPlane = (Uint8*)malloc(yPlaneSz);
    
uPlane = (Uint8*)malloc(uvPlaneSz);
    
vPlane = (Uint8*)malloc(uvPlaneSz);
    
if (!yPlane || !uPlane || !vPlane)
    
    throw myExceptions("Error : Can't create pixel array.");
    

    
uvPitch = pCodecCtx->width / 2;
    
}

    Here I fill the YUV image and write the packet.

    void FfmpegEncoder::encodeFrame(AVFrame * frame, int frameCount)
    
{
    
AVPacket    pkt = { 0 };
    
int         got_pkt;
    

    
av_init_packet(&pkt);
    
frame->pts = frameCount;
    

    
FillYuvImage(frame, frameCount, this->pCodecCtx->width, this->pCodecCtx->height);
    

    
if (avcodec_encode_video2(this->pCodecCtx, &pkt, frame, &got_pkt) < 0)
    
    throw myExceptions("Error: failed to encode the frame. FfmpegEncoder.cpp l:61\n");
    

    
//if the frame is well encoded
    
if (got_pkt) {
    
    pkt.stream_index = this->st->index;
    
    pkt.pts = av_rescale_q_rnd(pkt.pts, this->pCodecCtx->time_base, this->st->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
    
    if (av_write_frame(this->outFormatCtx, &pkt) < 0)
    
        throw myExceptions("Error: failed to write video frame. FfmpegEncoder.cpp l:68\n");
    
}
    
}
    

    
void FfmpegEncoder::FillYuvImage(AVFrame * pict, int frame_index, int width, int height)
    
{
    
int x, y, i;
    

    
i = frame_index;
    

    
for (y = 0; y < height; y++)
    
{
    
    for (x = 0; x < width / 2; x++)
    
        pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
    
}
    
for (y = 0; y < height; y++)
    
{
    
    for (x = 0; x < width / 2; x++)
    
    {
    
        pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
    
        pict->data[2][y * pict->linesize[2] + x] = 64 + y + i * 5; //segault here
    
    }
    
}
    
}

    The "FillYuvImage" method is copied from a FFMPEG example, but It does not work for me. If I don’t call it, the "av_write_frame" function won’t work (segfault too).

    EDIT : Here is my output context and codec initialization.

    FfmpegEncoder::FfmpegEncoder(char *url)
    
{
    
AVRational      tmp_time_base;
    
AVDictionary*   options = NULL;
    

    
this->pCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
    
if (this->pCodec == NULL)
    
    throw myExceptions("Error: Can't initialize the encoder. FfmpegEncoder.cpp l:9\n");
    

    
this->pCodecCtx = avcodec_alloc_context3(this->pCodec);
    

    
//Alloc output context
    
if (avformat_alloc_output_context2(&outFormatCtx, NULL, "rtsp", url) < 0)
    
    throw myExceptions("Error: Can't alloc stream output. FfmpegEncoder.cpp l:17\n");
    

    
this->st = avformat_new_stream(this->outFormatCtx, this->pCodec);
    

    
if (this->st == NULL)
    
    throw myExceptions("Error: Can't create stream . FfmpegEncoder.cpp l:22\n");
    

    
av_dict_set(&options, "vprofile", "main", 0);
    
av_dict_set(&options, "tune", "zerolatency", 0);
    

    
tmp_time_base.num = 1;
    
tmp_time_base.den = 60;
    

    
//TODO : parse these values
    
this->pCodecCtx->bit_rate = 3000000;
    
this->pCodecCtx->width = 1280;
    
this->pCodecCtx->height = 720;
    
//This set the fps. 60fps at this point.
    
this->pCodecCtx->time_base = tmp_time_base;
    
//Add a intra frame every 12 frames
    
this->pCodecCtx->gop_size = 12;
    
this->pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
    

    
//Open Codec, using the context + x264 options
    
if (avcodec_open2(this->pCodecCtx, this->pCodec, &options) < 0)
    
    throw myExceptions("Error: Can't open the codec. FfmpegEncoder.cpp l:43\n");
    

    
if (avcodec_copy_context(this->st->codec, this->pCodecCtx) != 0) {
    
    throw myExceptions("Error : Can't copy codec context. FfmpegEncoder.cpp : l.46");
    
}
    

    
av_dump_format(this->outFormatCtx, 0, url, 1);
    

    
if (avformat_write_header(this->outFormatCtx, NULL) != 0)
    
    throw myExceptions("Error: failed to connect to RTSP server. FfmpegEncoder.cpp l:48\n");
    
}

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