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    Unfortunately a software is never perfect.
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    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
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Sur d’autres sites (4278)

  • YUV422 to TIFF and PNG conversion giving different values

    30 novembre 2019, par Garry

    I’ve been doing some work with images captured from a CMOS image sensor and saved to YUV422. I’ve converted them to TIFF and PNG formats using both ImageMagick and FFMPEG and done some analysis of the images and noticed that the RGB values differ between the two image formats. I’m a little confused as to why as they’re both lossless formats and the images are in the sRGB colourspace (verified with ImageMagick ’identify’ command).
    Do they not use the same YCbCr->sRGB conversion algorithm ? Am I missing something about the conversion process ?

    I used the following commands to convert the images :

    ffmpeg -pix_fmt uyvy422 -s 972x972 -i input.yuv output.png
    
ffmpeg -pix_fmt uyvy422 -s 972x972 -i input.yuv output.tiff
    

    
magick -size "972x972" pal:input.yuv output.png
    
magick -size "972x972" pal:input.yuv output.tiff

  • Record a video conference application

    11 août 2014, par Matin Lotfaliee

    I want to record a video conference (e.g skype, oovoo, ...) with a program written in C#. I searched a lot about how to do this :

    • Here suggests Windows Media Encoder, but none of their samples work correctly on my Win7. I installed the SDK but even the links to Microsoft are somehow broken or old.
    • Here suggests creating a video stream from a series of screenshots using ffmpeg. but it is probably impossible to keep the audio,mic and screenshots synced.
    • Here seems to be a great solution but it is not free...

    Compression is not important to me because a video conference uses CPU a lot.

    Can you help me find a good solution ?

  • FFMpegCore .Net cuts off the fist few ( 1.5) seconds of audio

    28 mai 2024, par Tim

    I want to use FFMpegCore to convert some audio files to raw pcm. I noticed that this always cuts off 1.5 seconds of my audio from the start. I check my input stream, saved it to HD all good. If use it from cli with the same arguments everything seem fine. I tried -ss 0, no luck. This behavior is observed with .wav (RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz), same issue with different sample rate. I tested mp3 works fine.

    


    public async Task<memorystream> ConvertToPcmStreamAsync(Stream inputStream)&#xA;{&#xA;    var outputStream = new MemoryStream();&#xA;    &#xA;    var audioInput = new StreamPipeSource(inputStream);&#xA;    var audioOutput = new StreamPipeSink(outputStream);&#xA;&#xA;    await FFMpegArguments&#xA;        .FromPipeInput(audioInput)&#xA;        .OutputToPipe(audioOutput, options => options&#xA;            .WithCustomArgument("-ss 0 -f s16le -acodec pcm_s16le -ac 1"))&#xA;        .ProcessAsynchronously();&#xA;&#xA;    // Reset the position of the memory stream to the beginning&#xA;    outputStream.Position = 0;&#xA;&#xA;    return outputStream;&#xA;}&#xA;</memorystream>

    &#xA;

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