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• How to use gstreamer to save webcam video to file ?

  2 mars 2015, par sav

  I’ve been trying to get emgu to save same webcam video to file

  The problem is opencv only ssupports avi, and avi does not seem to suit a format like X264 very well.

  Could I use Gstreamer to do this for me in C ?

  It would be good if I could choose the file format and container type too. It would be good if I could use a format like schrodinger dirac.

  I’m new to GStreamer so I’m not quite sure if I’m on the right track here.

  EDIT

  I’ve managed to capture the webcam video using

  gst-launch-0.10 ksvideosrc ! autovideosink

  Now how to transcode this to a format like H264 or dirac ...?

  EDIT

  gst-launch-0.10 ksvideosrc num-buffers=10 ! decodebin2 !
  ffmpegcolorspace ! x264enc ! matroskamux ! filesink
  location=video.mkv

  This seems to create a file, but VLC player can’t read it.

• avcodec/mpeg12dec : parse A53 caption data embedded in SCTE-20 user data

  15 mars 2017, par Aman Gupta

  avcodec/mpeg12dec : parse A53 caption data embedded in SCTE-20 user data
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpeg12dec.c
  • [DH] tests/fate/subtitles.mak
  • [DH] tests/ref/fate/sub-cc-scte20

• How to save a vvideo from a RTSP server using Ffmpeg in C++ ?

  20 septembre 2021, par Tolga

  I am using Ffmpeg remuxing example code to save a mp4 file into another file. However my actual goal is saving the video from a RTSP server. The example works fine with the normal .mp4 files but when I try to save the video from RTSP Server I get following error on command prompt.

  


  [mp4 @ 02F9A8C0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 18000 >= 3000


  


  The RTSP server is created on my computer for testing using python gstream. I used the script here.

  


  Ffmpeg code in C++ is below where error occurs.

  


          iCamera->stream = iCamera->fmt->streams[iCamera->pkt->stream_index];
        iCamera->pkt->stream_index = map->stream_map[iCamera->pkt->stream_index];
        oCamera->stream = oCamera->fmt->streams[iCamera->pkt->stream_index];

        iCamera->pkt->pts = av_rescale_q_rnd(iCamera->pkt->pts, iCamera->stream->time_base, oCamera->stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        iCamera->pkt->dts = av_rescale_q_rnd(iCamera->pkt->dts, iCamera->stream->time_base, oCamera->stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        iCamera->pkt->duration = av_rescale_q(iCamera->pkt->duration, iCamera->stream->time_base, oCamera->stream->time_base);
        iCamera->pkt->pos = -1;
        
        if (av_interleaved_write_frame(oCamera->fmt, iCamera->pkt)) {
            printf("Error occured while muxing packet.\n"); exit(1);
        }