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Sur d’autres sites (8691)

  • How to set x264 encode parameters through ffmpeg AVCodecContext

    7 juillet 2021, par songqi

    I'm trying to use ffmpeg/libx264 to encode and transmit a real-time video, when I use av_dict_set(&opts, "tune", "zerolatency", 0); the system works well. As the X264 encode parameters are set by ffmpeg using av_dict_set, for some research purpose I want to change them by myself. But some parameters in x264_param_t can not correspond to those parameters in AVCodecContext, such as vfr_input. So I want to know if there is a directly way to transmit parameters into X264 encoder when using libx264 in ffmpeg.

    


    


    Can anyone help me ? Thanks

    


  • Rewind problem after convert *.mp3 to *.aac

    29 août 2020, par Vitaly Vesyolko

    I need to prepare audio files in MP3 format for sending via WhatsApp to Android and iOS devices with the ability to pause and mainly rewind.

    


    To do this, I use the ffmpeg utility on my notebook with Linux Ubuntu installed. Conversion example is described in detail here FFmpeg command to convert MP3 to AAC.

    


    As a result, I get AAC audio files that cannot be rewound in the WhatsApp player. I tried to set different options that are responsible for the output sound quality, size, and so on. But the ability to rewind in the WhatsApp player disappears.

    


    Rewind - is to slide by finger the circular slider in the WhatsApp audio player widget.

    


    I also used the following online services :

    


      

    1. ONLINE-CONVERT

      2. 


    2. Convertio

      3. 


    3. ZAMZAR.

      4. 


    


    One of the first two in some cases saves files with the ability to rewind, but in most cases - without it. And it very likely depends on the original file size. This is a hypothesis - if the size is small, then it is possible to rewind the audio file in the WhatsApp player. In any case, this method is not universal.

    


    Please provide a universal solution to the task at hand - a CLI utility or a tool that would convert MP3 to AAC with the ability to rewind in the WhatsApp player. And please indicate which characteristics are responsible for the absence / presence of such functionality.

    


  • Is there a way to automate / script video editing with python ?

    20 août 2020, par user2436057

    I do have the problem that I have to generate a daily video file for an information screen.

    


    I need to be able to create a video with preferably a python script that goes over all images in a directory and display each image for 10 seconds while scrolling corresponding text next to it and then display the next image. I might also have to have the ability to add a sound file or background music in the future.

    


    I have looked at ffmpeg and it has some ability to do what I want but I thought there might be a better way or tool I could use. Since ffmpeg takes a lot of steps and its really hacky.

    


    I am able to code the python myself I just need some API or library to handle the video processing.

    


    Not 100% this is the right place to ask.

    


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