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• avcodec/hcom : Check the root entry and the right entries

  7 octobre 2019, par Michael Niedermayer

  avcodec/hcom : Check the root entry and the right entries
  Fixes : Segfault
  
  Fixes : 17991/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HCOM_fuzzer-5647235349479424
  Also fixes related memleak
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/hcom.c

• What's the replacement for the avcodec_thread_init ?

  7 mai 2015, par Nyaruko

  I am using ffmpeg to encode/decode videos.
  I used a old version in the past, but recently I switched a new version and found that many ffmpeg functions are non-longer in use.

  Here is my old code :

   pCodecCtx=pVideoStream->codec;
  
     pCodecCtx->codec_id = pOutputFormat->video_codec;
  
     pCodecCtx->codec_type = ffmpeg::AVMEDIA_TYPE_VIDEO;
  
  
  
     pCodecCtx->bit_rate = Bitrate;
  
     pCodecCtx->width = getWidth();
  
     pCodecCtx->height = getHeight();
  
     pCodecCtx->time_base.den = fps;
  
     pCodecCtx->time_base.num = 1;
  
     pCodecCtx->gop_size = Gop;
  
     pCodecCtx->pix_fmt = ffmpeg::PIX_FMT_YUV420P;
  
  
  
  
  
     avcodec_thread_init(pCodecCtx, 10);
  
  
  
     //if (c->codec_id == CODEC_ID_MPEG2VIDEO)
  
     //{
  
        //c->max_b_frames = 2;  // just for testing, we also add B frames
  
     //}
  
  
  
     // some formats want stream headers to be separate
  
     if(pFormatCtx->oformat->flags & AVFMT_GLOBALHEADER)
  
        pCodecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
  
  
     if (av_set_parameters(pFormatCtx, NULL) < 0)
  
     {
  
        printf("Invalid output format parameters\n");
  
        return false;
  
     }
  
  
  
     ffmpeg::dump_format(pFormatCtx, 0, fileName.toStdString().c_str(), 1);
  
  
  
     // open_video
  
     // find the video encoder
  
     pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
  
     if (!pCodec)
  
     {
  
        printf("codec not found\n");
  
        return false;
  
     }
  
     // open the codec
  
     if (avcodec_open(pCodecCtx, pCodec) < 0)
  
     {
  
        printf("could not open codec\n");
  
        return false;
  
     }
  
  
  
     // Allocate memory for output
  
     if(!initOutputBuf())
  
     {
  
        printf("Can't allocate memory for output bitstream\n");
  
        return false;
  
     }
  
  
  
     // Allocate the YUV frame
  
     if(!initFrame())
  
     {
  
        printf("Can't init frame\n");
  
        return false;
  
     }
  
  
  
     if (url_fopen(&pFormatCtx->pb, fileName.toStdString().c_str(), URL_WRONLY) < 0)
  
     {
  
        printf( "Could not open '%s'\n", fileName.toStdString().c_str());
  
        return false;
  
     }
  
  
  
     av_write_header(pFormatCtx);

  Here, avcodec_thread_init is no-longer in use and I cannot find anyhints about what function I should use to replace it ? Any ideas ?

• NGINX RTMP Server - Continuity replacement of track

  6 janvier 2023, par sweetngx

  I broadcast my video archive as live streaming with FFMpeg or similar applications. But since there are multiple videos, ffmpeg reconnects with the rtmp server in each new track, and while watching the live stream, the connection naturally terminates in each video transition and I continue watching by reconnecting to rtmp. What I want to do is that when ffmpeg switches to each new track, the rtmp server does not terminate my connection and continues the new video stream without interruption, that is, in flow changes, the rtmp server can wait for the new flow for a while and continue where it left off. I actually tried to do this using wait_video but it is not efficient and stable enough. How do you think I can solve this problem ? Should I solve it on the FFMpeg side or should I solve it on the Rtmp Server side ? All my videos have the same resolution and codec properties