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• what is the filter of my FFMPEG scaling command ?

  15 décembre 2017, par Atrin

  I have upscaled and downscaled an image with following command.

  ffmpeg -s:v 1280:720 -r 25 -i input.yuv -vf scale=1920x1080 -c:v rawvideo -pix_fmt yuv420p out.yuv

  I'm wondering what kind of filter is used to do down scaling (linear, bicubic,...)?

  and how can I change the filter or add it if there is no filter in this command?

• libavcodec determine codec features

  14 décembre 2017, par seanr8

  Is there a way to programmatically determine features of a codec?

  I ask because I'm seeing a bug in my code where setting the avcodec_context->max_b_frames value with some codecs is causing a core dump when attempting to use the "flv" codec because FLV doesn't support B Frames

• C# documentation about how to add an event handler [duplicate]

  14 décembre 2017, par DevFranz_Tech

  This question already has an answer here:

  • Understanding events and event handlers in C# 9 answers

  I am coding a video converter using NRECO and ffmpeg everything works but when it comes at to get the Progress time i've tried

  pgbConversion.Value = FFMpegConverter.ConvertProgress();
  

  but it is impossible so i got ! ** **ConvertProgress is an even; please check C# documentation about how to add an even handler.****

  from NReco please how can i get the video progress knowing that ConvertProgrss is an event

• C# documentation about how to add an even handler [duplicate]

  14 décembre 2017, par DevFranz_Tech

  This question already has an answer here:

  • Understanding events and event handlers in C# 9 answers

  I am coding a video converter using NRECO and ffmpeg everything works but when it comes at to get the Progress time i've tried

  pgbConversion.Value = FFMpegConverter.ConvertProgress();
  

  but it is impossible so i got ! ** **ConvertProgress is an even; please check C# documentation about how to add an even handler.****

  from NReco please how can i get the video progress knowing that ConvertProgrss is an event

• Encode images on the fly into an mp4 video using ffmpeg

  14 décembre 2017, par Kushagra

  I was wondering if there's a way where I can append images at the end of video. I'm capturing an image every 10th frame and approximately after 10 seconds I want all the images captured encoded into a video. I tried the traditional way of saving all the captured images and then running the //-y -i .../image%1d.jpg -r 30 video.mp4 ffmpeg command but this takes like 15-20 seconds on Android, not tested iOS yet. Wondering if there's a way where I can encode these images on the fly to be part of one single video output ? I've been googling for the last couple of days but none of the solution I've seen so far has worked for me. Also, in all of this, there is no audio involved at all.

  Note : I'm working only with Android and iOS using Unity and I'm looking for high performance encoding.

  If you know of any other codec that can be used to achieve this let me know that as well