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• How to make words in ASS subtitles appear one at a time ?

  21 septembre 2022, par ThaDon

  I am trying to burn subtitles into a video such that they appear in a word-by-word fashion instead of all at once.

  



  What I mean by this is, a word will appear, then another word will appear next to it, and so on. Eventually the line will clear, then repeat.

  



  Example :

  



  

  



  I thought I could create an Advanced Substation Alpha file where subtitles share the same end-time but differing start times, however FFMPEG doesn't seem to cope very well when rendering the file :

  



  [Script Info]
; Script generated by FFmpeg/Lavc57.107.100
ScriptType: v4.00+
PlayResX: 384
PlayResY: 288

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,16,&Hffffff,&Hffffff,&H0,&H0,0,0,0,0,100,100,0,0,1,1,0,2,10,10,10,0

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:03.46,Default,,0,0,0,,I'm
Dialogue: 0,0:00:01.00,0:00:03.46,Default,,0,0,0,,a
Dialogue: 0,0:00:01.50,0:00:03.46,Default,,0,0,0,,subtitle


  



  The idea being that I'm would appear, then 1 second later a would show up next to it followed by subtitle a half second later

  


• cocoa pods minimum version error ffmpeg kit flutter

  4 février 2024, par Rubén

  So, I recently started working on Mac and I wanted to build my Flutter App, so I installed CocoaPods and started searching for a solution, but I couldn't find any that solved my problem, any help appreciated.

  


  Tried to manage my dependencies version on my pubspec.yaml but didn't solve my problem.

  


  My final thought is to replace the ffmpeg dependency version on the pod file (because its being set automatically) but I don't know how to do it.

  


  This is my log output :

  


  CocoaPods&#x27; output:&#xA;↳&#xA;      Preparing&#xA;&#xA;    Analyzing dependencies&#xA;&#xA;    Inspecting targets to integrate&#xA;      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)&#xA;      Using `ARCHS` setting to build architectures of target `Pods-RunnerTests`: (``)&#xA;&#xA;    Fetching external sources&#xA;    -> Fetching podspec for `FlutterMacOS` from `Flutter/ephemeral`&#xA;    -> Fetching podspec for `ffmpeg_kit_flutter` from `Flutter/ephemeral/.symlinks/plugins/ffmpeg_kit_flutter/macos`&#xA;    -> Fetching podspec for `path_provider_foundation` from `Flutter/ephemeral/.symlinks/plugins/path_provider_foundation/darwin`&#xA;&#xA;    Resolving dependencies of `Podfile`&#xA;      CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only performed in repo update&#xA;      CDN: trunk Relative path: all_pods_versions_c_0_4.txt exists! Returning local because checking is only performed in repo update&#xA;      CDN: trunk Relative path: Specs/c/0/4/Flutter/3.13.0/Flutter.podspec.json exists! Returning local because checking is only performed in repo update&#xA;    [!] CocoaPods could not find compatible versions for pod "ffmpeg_kit_flutter/https":&#xA;      In Podfile:&#xA;        ffmpeg_kit_flutter (from `Flutter/ephemeral/.symlinks/plugins/ffmpeg_kit_flutter/macos`) was resolved to 6.0.3, which depends on&#xA;          ffmpeg_kit_flutter/https (= 6.0.3)&#xA;&#xA;    Specs satisfying the `ffmpeg_kit_flutter/https (= 6.0.3)` dependency were found, but they required a higher minimum deployment target.&#xA;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:317:in `raise_error_unless_state&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:299:in `block in unwind_for_conflict&#x27;&#xA;    :90:in `tap&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:297:in `unwind_for_conflict&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:682:in `attempt_to_activate&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:254:in `process_topmost_state&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:182:in `resolve&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/molinillo-0.8.0/lib/molinillo/resolver.rb:43:in `resolve&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/resolver.rb:94:in `resolve&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer/analyzer.rb:1082:in `block in resolve_dependencies&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/user_interface.rb:64:in `section&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer/analyzer.rb:1080:in `resolve_dependencies&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer/analyzer.rb:125:in `analyze&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer.rb:422:in `analyze&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer.rb:244:in `block in resolve_dependencies&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/user_interface.rb:64:in `section&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer.rb:243:in `resolve_dependencies&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/installer.rb:162:in `install!&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/command/install.rb:52:in `run&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/claide-1.1.0/lib/claide/command.rb:334:in `run&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/lib/cocoapods/command.rb:52:in `run&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/gems/cocoapods-1.14.3/bin/pod:55:in `<top>&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/bin/pod:25:in `load&#x27;&#xA;    /opt/homebrew/Cellar/cocoapods/1.14.3_1/libexec/bin/pod:25:in `<main>&#x27;&#xA;&#xA;Exception: Error running pod install&#xA;</main></top>

  


  This is My Mac Podfile :

  


  ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
  target 'RunnerTests' do
    inherit! :search_paths
  end
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
end


  


• iOS Objective C Opus audio stream kAudioFormatOpus — specification / conversion query

  16 avril 2022, par deffodeffo

  I'm working on a React Native voice app wanting to record straight to an Opus stream.

  


  On the iOS side at device level, I'm working in Objective C and I'm using an AVAudioSession recorder with formatID set to kAudioFormatOpus. The recorder captures audio data in the specified format and passes packets for upstreaming to the React Native app.

  


  This is all working well and emitting a stream of audio data when I run my code on an iOS Simulator or real device.

  


  My problem is when I receive the audio stream in the backend, I find I'm unable to reliably decode the Opus stream using ffmpeg. (I wish to decode to PCM.)

  


  Whilst I could post up specific code to show what I'm doing in more detail, my question at this stage is more generic in nature :

  


  Is anyone familiar with the format of Opus audio stream that is generated by iOS AudioSession recorder under audio format kAudioFormatOpus ? Is anyone able to suggest proven conversion techniques ? (e.g. some ffmpeg commands), or else hook me up with some links to format specs so I can figure out what is going on here ?

  


  The Apple Developer documentation contains zero useful information : https://developer.apple.com/documentation/coreaudiotypes/1572096-audio_data_format_identifiers/kaudioformatopus?changes=la__2&language=objc

  


  I have looked all over the internet, but I'm unable to find any useful spec info that corresponds to the stream that AVAudioSession recorder is outputting. I have seen a few posts which say Apple have not fully complied with the Opus spec, but I don't know enough about the proper structure of Opus to ascertain this for myself.

  


  Any help would be very much appreciated.

  


  Thanks all