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• I can't start dream recording ? [closed]

  5 mars 2024, par usny1986

  I'm looking for an app to record my dreams so i can watch them later. (I want it to record speech sounds too). The apps i've tried so far haven't worked properly.

  


  When I start to see my dream, the applications usually give an error that ffmpeg is not installed. Yes, this error doesn't occur if I dream in the dark at night. But the problem is that i sleep during the day, so i dream during the day. Even though I installed the latest version of FFmpeg, I was not successful.

  


  Is there a successful app to record daytime dreams ?

  


  I tried the "HD Dream Captura" application. But it didn't work. It doesn't work during the day. It also gives a memory full error and is constantly interrupted. But I have enough free space in my brain to be able to see my dreams.

  


• In what way does this HEVC video not comply to Apples's requirements document ?

  16 novembre 2022, par Duke Dougal

  My goal is to work out why a given video file does not play on Macos/Safari/Quicktime.

  


  The background to this question is that it is possible to play HEVC videos with a transparent background/alpha channel on Safari/MacOS. To be playable, a video must meet the specific requirements set out by Apple in this document :

  


  https://developer.apple.com/av-foundation/HEVC-Video-with-Alpha-Interoperability-Profile.pdf

  


  The video that does not play on Apple/Safari/Quicktime is an HEVC video with an alpha transparency channel. Note that VLC for MacOS DOES play this file. Here it is :

  


  https://drive.google.com/file/d/1ZnXjcDbk-_YxTgRuH_D7RSR9SXdY_XTv/view?usp=share_link

  


  I have two example HEVC video files with a transparent background/alpha channel, and they both play fine using either Quicktime player or Safari :

  


  Working video #1 :

  


  https://drive.google.com/file/d/1PJAyg_sVKVvb-Py8PAu42c1qm8l2qCbh/view?usp=share_link

  


  Working video #2 :

  


  https://drive.google.com/file/d/1kk8ssUyT7qAaK15afp8VPR6mIWPFX8vQ/view?usp=sharing

  


  The first step is to work out in what way my non-working video ( https://drive.google.com/file/d/1ZnXjcDbk-_YxTgRuH_D7RSR9SXdY_XTv/view?usp=share_link ) does not comply with the specification.

  


  Once it is clear which requirements are not met by the non-working video then I can move onto the next phase, which is to try to formulate an ffmpeg command that will output a video meeting the requirements.

  


  I have read Apples requirements document and I am out of my depth in trying to analyse the non working video against the requirements - I don't know how to do it.

  


  Can anyone suggest a way to identify what is wrong with the video ?

  


  Additional context is that I am trying to find a way to create Apple/MacOS compatible alpha channel / transparent videos using ffmpeg with hevc_nvenc running on an Intel machine. I am aware that Apple hardware can create such videos, but for a wide variety of reasons it is not practical for me to use Apple hardware to do the job. I have spent many hours trying all sorts of ffmpeg and ffprobe commands to try to work out what is wrong and modify the video to fix it, but to be honest most of my attempts are guesswork.

  


• ffmpeg - Replace one word audio in video at different specific timeline [duplicate]

  17 décembre 2019, par Siddharth

  This question is an exact duplicate of :

  • Can I extract an audio clip (a single word) from the video and insert at different points/timeline of same video using FFMPEG/libvlcsharp ?

  How can i replace one word (newyork to be replaced by california) throughtout the video where speaker says "Newyork". I want that "Newyork" word to be removed from the audio (while keeping video intact) and insert "california" throughout the video at different places.

  I have an audio file where speaker says "California" which i want to replace with "newyork" word.

  How can i do that using FFMPEG ?