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• avformat/segafilmenc : Remove redundant checks

  14 janvier 2020, par Andreas Rheinhardt

  avformat/segafilmenc : Remove redundant checks
  If an audio stream is present, the Sega FILM muxer checks for its
  
  compability with the container during init, so that the very same check
  
  needn't be repeated during writing the trailer.
  Essentially the same is true for the presence of a video stream : It has
  
  already been checked during init. Furthermore, after the check for the
  
  presence of a video stream succeeded, a pointer is set to point to the
  
  video stream. Yet said pointer (which was NULL before) will be
  
  derefenced anyway regardless of the result of the check. Coverity thus
  
  complained about this in CID 1434155 and removing this pointless check
  
  will also fix this issue.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/segafilmenc.c

• How do I configure codec parameters for a RTSP stream ?

  16 mai 2024, par Kermit

  I am trying to stream a network camera source into /dev/video0. However, all attempts keep telling me I have set incorrect codec parameters. Any suggestions ?

  


  # works
ffplay rtsp://admin:password@172.16.0.184:554/live


  


  Then trying any of these to feed into /dev/video0 (valid from list of ls /dev/video*) :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://admin:password@172.16.0.184:554/live" -c:v rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0


  


  Results in

  


  ffmpeg version 5.1.4-0+rpt3+deb12u1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=0+rpt3+deb12u1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, rtsp, from 'rtsp://admin:password@172.16.0.184:554/live':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 3840x2160, 30 fps, 100 tbr, 90k tbn
  Stream #0:1: Audio: aac (LC), 32000 Hz, mono, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x55562d9faa70] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!


  


• create thumbnail from video URL in C#

  23 mai 2016, par Hashem Aboonajmi

  I want to generate thumbnail from a video URL in C#. I have searched a lot to find a neat way but no success. I have used Nreco and MediaToolKit but none of them extract thumbnail image. using ffmpeg also has mumbo jumbos which didn’t worked !

  using NReco :

  var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
  string thumbnailJPEGpath = "http://localhost:81882/content/hashem.jpeg";
  
  ffMpeg.GetVideoThumbnail(videoUrl,thumbnailJPEGpath);

  using ffmpeg :

  try
  
          {
  
              System.Diagnostics.Process ffmpeg;
  
  
  
              string video;
  
              string thumb;
  
  
  
              video = Server.MapPath("~/Content/Movies/bye.mp4");
  
              thumb = Server.MapPath("~/Content/frame.jpg");
  
  
  
              ffmpeg = new System.Diagnostics.Process();
  
  
  
              ffmpeg.StartInfo.Arguments = " -i " + video + " -ss 00:00:07 -vframes 1 -f image2 -vcodec mjpeg " + thumb;
  
              ffmpeg.StartInfo.FileName = Server.MapPath("~/Content/ffmpeg.exe");
  
              ffmpeg.Start();
  
              ffmpeg.WaitForExit();
  
              ffmpeg.Close();
  
          }
  
          catch (Exception ex)
  
          {
  
              Response.Write("Error: " + ex.Message);
  
          }

  to consider video files are not local and I have only a direct link to the file :
  e.g. :http://phytonord.com/Film-Series/hana/26.mp4

  does anyone has any solution ? any sample code that works ?