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• Converting a YUV file to .mp4 using ffmpeg for a beginner

  11 mars 2014, par GreenGodot

  I'm a newbie when it comes to linux and ffmpeg but I need to use Evalvid to stream a video file. I want to stream a file for around 500 seconds. My plan is to download one of the videos from here :

  http://media.xiph.org/

  For this example I downloaded a video of Big Buck Bunny (in this case the 480p version). it came in an xz which I used unxz on, getting me a .y4m file which I used ffmpeg to convert to a YUV file.

  ffmpeg -i big_buck_bunny_480p24.y4m bbb.yuv

  My problem is right here, I try to use examples from this site but they don't work. What is the exact command to convert it to a .mp4 file using ffmpeg or are their easier alternatives to use ?

  I have tried :

   ffmpeg -f rawvideo -s:v 1920x1080 -r 25 -i bbb.yuv -c:v libx264 output.mp4

  and this starts the conversion process but after 5 minutes I get an invalid buffer value error and the output is a mess of colours.

• Convert from NV12 to RGB/YUV420P using libswscale

  29 août 2017, par Ruben Sanchez Castellano

  I’m developing an application which needs to transform NV12 frames from h264_cuvid decoder to RGB in order to modify those frames. I checked this question but I don’t not the ’Stride’ value.

  My code is the following :

  uint8_t *inData[2] = { videoFrame->data[0], videoFrame->data[0] + videoFrame->width * videoFrame->height };
  
  int inLinesize[2] = { videoFrame->width, videoFrame->width };
  
  
  
  sws_scale(convert_yuv_to_rgb, inData, inLinesize, 0, videoFrame->height, aux_frame->data, aux_frame->linesize);

  But it does not work. Although the problem is on colours because I can see the luminance plane correctly.

• Fluent FFmpeg Thumbnail Extraction Error : "muxing overhead : unknown, conversion failed"

  21 août 2024, par Abdul Hannan Mahmood

  I'm trying to extract a thumbnail from a video using Fluent FFmpeg, but I'm encountering the error "muxing overhead : unknown, conversion failed." Despite this error, the thumbnail is being generated correctly.

  


  Here's my code :

  


  const screenshotPath = resolve(`${output}/${videoId}_thumbnail.png`);
ffmpeg(inputUrl)
  .screenshots({
    timestamps: [timestamp],
    filename: screenshotPath,
    size: '640x360'
  })
  .output(screenshotPath)
  .on('error', (err) => {
    log.error(`VideoId:${videoId} -> Error while extracting screenshot`, err);
  });


  


  I've already verified the following :

  


  

  • Input file integrity : The input video file is not corrupted.

  


  • Supported formats : The video format is compatible with Fluent FFmpeg.

  


  • System resources : My system has sufficient resources for the conversion.

  


  • Conversion tool : I'm using the latest version of Fluent FFmpeg.

  


  


  Despite these checks, the error persists. I'm wondering if this is a known issue or if there's something else I might be missing.