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  • getting very bad image after encoding

    20 avril 2012, par user1310596

    I am encoding images using avcodec_encode_video method and displaying them on subscriber demo of the Red5 media server.

    The problem i am facing is that all the images which are being displayed are totally distorted and nothing is clearly visible. I think something might be wrong with the pix_fmt set in avcodec context.
    Moreover image size is also quite large as 64000 bytes after encoding which I think is little weird
    Please give me solution of this problem. Any help is appreciated.

  • Read Audio and Video, edit Video frame, then write back Audio and Video - Using python

    19 avril 2021, par CowKeyMan

    I'm looking to do exactly as the title says, ie :

    


      

    1. Read a file containing both audio and video

      2. 


    2. Edit the video frames individually

      3. 


    3. Write back the video with the new frames but the same exact audio as before

      4. 


    


    OpenCV is not a good option for reading and writing since it doesn't handle audio, altough I can use opencv in step 2.

    


    The language I am using is Python, as this needs to be integrated with a bigger system.

    


    My question is this : What software stack / librarries are appropriate for this kind of task and if anyone can point me to some resources it would be highly appreciated

    


    So far I have found the following options, but would like some feedback on them based on experience :

    


      

    1. ffmpeg

      2. 


    2. MoviePy

      3. 


    3. libav

      4. 


    


  • ffmpeg - why I have three video streams in the output file when I have one video input (one video stream), one logo input

    17 juillet 2024, par Yazhou

    Hi I'm using ffmpeg to transcode some video files from prores or dv to h264/mov. Also I want to add a logo on it and make some other changes.
The command line I use is

    


    ffmpeg -i input.mov -i logo.png -c:a aac -c:v libx264 -pix_fmt yuv420p -crf 18 -map 0:a? -map 0:v -filter_complex "yadif,[1]scale=iw*1:-1[wm];[0:v:0][wm]overlay=main_w-overlay_w-5:5" -disposition:v:0 default output_h264.mov

    


    And what I got has three video streams. One for the logo,one for the video with logo, and one for original video.

    


    Though I put the default video stream as the one with both video and logo as you can see for -disposition:v:0 default, and it's also playing that stream. But when I tried to upload it on Vimeo or Youtube, it uses the wrong stream.

    


    


    How can I change the command line to let ffmpeg only output one stream ?
And how can I remove the extra streams for the existed outcomes ?

    


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