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• scale a video to multiple qualities and add watermark

  8 mars 2019, par jared zek

  hello I have a ffmpeg command that scales a video to 2 different qualities and adds a watermark, the problem here is that the watermark is scaled along with the videos and it looks horrible

  D:\electron\brenda\node_modules\ffmpeg-static\bin\win32\x64\ffmpeg.exe -i C:\Users\Andy\Desktop\entrada\videoplayback.mp4 -i C:\Users\Andy\Desktop\entrada\marca.png -filter_complex [0:0]scale=854:480[wm]; [wm][1:0]overlay=x=0:y=0[out] -map [out] -map 0:a -movflags faststart -preset fast -y C:\Users\Andy\Desktop\salida/480_videoplayback.mp4 -filter_complex [0:0]scale=640:360[wm]; [wm][1:0]overlay=x=0:y=0[out] -map [out] -map 0:a -movflags faststart -preset fast -y C:\Users\Andy\Desktop\salida/360_videoplayback.mp4

  video scaled to 360 with watermark

  I want the watermark to remain in its original size and not escalate with the video, thank you for your help I’ve been here for hours

• pthread_frame : use better memory orders for frame progress

  9 décembre 2016, par Wan-Teh Chang

  pthread_frame : use better memory orders for frame progress
  This improves commit 59c70227405c214b29971e6272f3a3ff6fcce3d0.
  In ff_thread_report_progress(), the fast code path can load
  
  progress[field] with the relaxed memory order, and the slow code path
  
  can store progress[field] with the release memory order. These changes
  
  are mainly intended to avoid confusion when one inspects the source code.
  
  They are unlikely to have measurable performance improvement.
  ff_thread_report_progress() and ff_thread_await_progress() form a pair.
  
  ff_thread_await_progress() reads progress[field] with the acquire memory
  
  order (in the fast code path). Therefore, one expects to see
  
  ff_thread_report_progress() write progress[field] with the matching
  
  release memory order.
  In the fast code path in ff_thread_report_progress(), the atomic load of
  
  progress[field] doesn’t need the acquire memory order because the
  
  calling thread is trying to make the data it just decoded visible to the
  
  other threads, rather than trying to read the data decoded by other
  
  threads.
  In ff_thread_get_buffer(), initialize progress[0] and progress[1] using
  
  atomic_init().
  Signed-off-by : Wan-Teh Chang <wtc@google.com>
  
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  Merges Libav commit 343e2833.
  Signed-off-by : wm4 <nfxjfg@googlemail.com>
  

  • [DH] libavcodec/pthread_frame.c

• TimeSpan in Aforge.Net, set time for each image in a video

  23 décembre 2020, par Siddhant Singh

  I have a query I am creating a video from the set of images using the Aforge.net framework but the video is playing very fast I want at least 5 seconds for each image in the video, I have tried using timeSpan but I didn’t get the desired result.
could anyone please suggest me or help me to find out my solution.

  


  here is my code

  


  TimeSpan timeSpan = new TimeSpan(0, 0, 5);
string[] paths = Directory.GetFiles(basePaths);
int imagesCount = paths.Length;
using (var vFWriter = new VideoFileWriter())
{

vFWriter.Open(@”D:\videosss.avi”, 1920, 1080,1,VideoCodec.MPEG4,4000000);

for (int i = 0; i < imagesCount; i++)
{
var imagePath = string.Format(paths[i]);
using (Bitmap image = Bitmap.FromFile(imagePath) as Bitmap)
{
vFWriter.WriteVideoFrame(image,timeSpan);

}

}
}
}


  


  if I use timespan the first image plays the whole time of timespan, if I don't use timespan the video plays well but fast. the directory contains 15 images I want 5 or 6 sec at least for each image in the video. where the 45 sec is my total time.

  


  thanks