Newest 'ffmpeg' Questions - Stack Overflow

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• FFmpeg check channels of a 7.1 audio for silence

  24 septembre 2019, par Tina J

  This is a follow-up question from my previous question asked here, where I needed to look for silence within a specific audio track. Here is the ffmpeg life-saver solution where helps to get some metadata:

  ffmpeg -i file -map 0:a:1 -af astats -f null -
  

  But I have other type of input .mp4 files where they have one single track of 8 (i.e. 7.1) audio channels. Apparently these files are transcoded from an original file (somehow the 4 track stereos are squished into these files). Now similar to my previous, I need to know if the original file was 2-channel stereo or 5.1 (6) channel.

  How to know if a specific channel of an audio track (say Center channel) is silent/mute, possibly using ffmpeg? Here is a sample .mp4 file.

• Recording video report for protractor execution on a remote environment

  23 septembre 2019, par Debasish Mukherjee

  I am executing my protractor test suite from my desktop and I am using a remote selenium server. I have configured the 'protractor-video-reporter' to capture execution for my local windows environment (using ffmpeg codec) and when I execute using my local selenium server, the video capture works fine. But when I execute on remote VMs, it captures my desktop screen. I understand that I need to provide the remote location path to ffmpeg codec, but I do not know how to provide appropriate user credentials so that my automation can invoke the remote plugin? My present configuration is as follows:

  const VideoReporter = require('protractor-video-reporter');
  ...
  let config = {
  ...
   onPrepare: () => {
   ...
   VideoReporter.prototype.jasmineStarted = function () {
  			var self = this;
  			if (self.options.singleVideo) {
  				var videoPath = path.join(self.options.baseDirectory, 'protractor-specs.mpg');
  				self._startScreencast(videoPath);
  				if (self.options.createSubtitles) {
  					self._subtitles = [];
  					self._jasmineStartTime = new Date();
  				}
  			}
  	};
   ...
   jasmine.getEnv().addReporter(new VideoReporter({
  	baseDirectory: './test-output/videoreport',
  	createSubtitles: false,
  	saveSuccessVideos: true,
  	singleVideo: true,
  	ffmpegCmd: "C:/FFmpeg/bin/ffmpeg.exe", /*Probably some changes needed here*/
  	ffmpegArgs: [
  				'-f', 'gdigrab',
  				'-framerate', '30',
  				'-video_size', 'wsxga',
  				'-i', 'desktop',
  				'-q:v', '10',
  	]
  }));
   ...
    }
    ...
  }
  export { config };

  Considering that execution and video capture both has to happen in remote server, please suggest a suitable solution.

• What's the best way to get video metadata from a MP4 file in ASP.Net MVC using C# ?

  23 septembre 2019, par Maddhacker24

  I've been searching on Google and StackOverflow for a good couple of hours. There seems to be a lot of similar questions on StackOverflow but they are all about 3-5 years old.

  Is using FFMPEG still the best way these days to pull metadata from a video file in a .NET web application? And if so, what's the best C# wrapper out there?

  I've tried MediaToolkit, MediaFile.dll without any luck. I saw ffmpeg-csharpe but that looks like it hasn't been touched in a few years.

  I haven't found any current data on this subject. Is the ability to pull metadata from a video built into the latest version of .NET now?

  I'm basically looking for any direction at this point.

  I should add that whatever I use could be invoked thousands of times per hour so it will need to be efficient.

• Regarding making a AVI file from G.711 PCM audio and H264 video

  23 septembre 2019, par Nidheesh V

  I have a G711 alaw and G711 ulaw audio pipes, and a h.264 video pipe.

  ---

  I want to create a .avi file which is made using the G711 audio and video using ffmpeg binary.

  i have tried using the below commands to generate ,but no luck

  ffmpeg -f h264 -i  /tmp/stream-0.h264 -vcodec  copy  -f pcm_alaw -i /tmp/audio-0.g711   -acodec copy  /tmp/sdcard/re_main.avi.
  

  When i run this command, the ffmpeg just hangs with the below print

  Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 25.00 (50/2)
  Input #0, h264, from '/tmp/stream-0.h264':
    Duration: N/A, bitrate: N/A
      Stream #0.0: Video: h264, yuv420p, 1920x1080, 25 fps, 25 tbr, 1200k tbn, 50 tbc
  

  How can we make a AVI file?

• How to merge audio with the processed video for real time streaming ?

  23 septembre 2019, par Padfoot

  I am detecting objects on a RTMP video+audio stream. The output, object detected video stream doesn't contain audio in it. How to merge the audio back to the output for real-time video+object streaming output ?

  I am using YOLO in darknet C framework. The FPS is 40. Also the output stream needs to be in 25-30 FPS.