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• (C) avcodec_receive_frame (ffmpeg) function always returns AVERROR(EAGAIN)

  13 avril 2021, par Levyu

  I was following this tutorial : http://dranger.com/ffmpeg/tutorial01.html
and was trying to change some deprecated functions, and so I had to try to use the avcodec_send_packet and avcodec_receive_frame functions.

  


  The problem I'm having is that avcodec_receive_frame always returns AVERROR(EAGAIN).

  


  My decoding function is as follows :

  


  static int decode(AVCodecContext *pCodecCtx, AVFrame *pFrame, AVPacket *packet) {
    
    int ret = avcodec_send_packet(pCodecCtx, packet);
    if (ret<0) {
        fprintf(stderr, "error sending packet for decoding\n");
        exit(1);
    }

    while (ret>=0) {        
        // avcodec_receive_packet(pCodecCtx, NULL);
        ret = avcodec_receive_frame(pCodecCtx, pFrame);
        if (ret == AVERROR(EAGAIN)) {
            fprintf(stderr, "\naverror(eagain) ret = %d\n", ret);
            return -1;
        }
        else if (ret == AVERROR_EOF) {
            fprintf(stderr, "eof\n");
            return -100;
        }
        else if (ret <0) {
            fprintf(stderr, "error during decoding\n");
            exit(1);
        }
    }
    return 0;
}


  


  Everywhere I read said that this is solved by calling avcodec_send_packet with the next frame, but this does not solve the problem for me because this function is being called in a loop :

  


  
    while (av_read_frame(pFormatCtx, &packet)>=0) {
        // is this a packet from the video stream?
        if (packet.stream_index==videoStream) {

           frameNotFinished = decode(pCodecCtx, pFrame, &packet);

            // did we get a video frame?
            if (!frameNotFinished) fprintf(stderr, "it worked!");
        }
        av_packet_unref(&packet);   
    }


  


  I should probably also add that avcodec_send_packet always returns 0 (success).

  


  Any help would be much appreciated.

  


• hevc_ps : make sure failing to decode an SPS always returns an error

  13 juillet 2015, par Anton Khirnov

  hevc_ps : make sure failing to decode an SPS always returns an error
  Some of the goto err clauses do not set the error code. It seems better
  
  to fall back on INVALIDDATA instead of adding it everywhere explicitly.
  

  • [DBH] libavcodec/hevc_ps.c

• Configure ffmpeg to work with native client

  11 juin 2016, par Mohammad Abu Musa

  I followed the steps https://chromium.googlesource.com/webports/+/master to port ffmpeg to native client. I do not know what is the issue here. here are the configuration and here what I get

  NACL_ARCH=pnacl TOOLCHAIN=pnacl make ffmpeg

  Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/\@anchor{ <-- HERE (?:[^\}]*)\}/ at /home/user/Desktop/webports/src/out/build/ffmpeg/ffmpeg-2.6.1/doc/texi2pod.pl line 387.
MAN doc/ffmpeg.1
MAN doc/ffprobe.1
MAN doc/ffmpeg-all.1
MAN doc/ffprobe-all.1
LD  ffmpeg_g
LD  ffprobe_g
/home/user/Desktop/webports/src/out/build/ffmpeg/ffmpeg-2.6.1/Makefile:124: recipe for target 'ffprobe_g' failed
make[1]: *** [ffprobe_g] Error 247
make[1]: *** Waiting for unfinished jobs....
/home/user/Desktop/webports/src/out/build/ffmpeg/ffmpeg-2.6.1/Makefile:124: recipe for target 'ffmpeg_g' failed
make[1]: *** [ffmpeg_g] Error 247
make[1]: Leaving directory '/home/user/Desktop/webports/src/out/build/ffmpeg/build_pnacl'
webports: Build failed: 'ffmpeg' [pnacl/release]
Makefile:89: recipe for target 'ffmpeg' failed
make: *** [ffmpeg] Error 1