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• Why the converted videos file size is greater than original file size ?

  6 décembre 2011, par svk

  I am using ffmpeg to convert the videos into mp4.Its working fine and its playing with high quality.No problem.But the worst case is I uploaded 14Mb file and after converting it goes to 30 Mb file.I am using the following the script to convert

  exec("ffmpeg -i videowithaudio.flv -vcodec libx264 -vpre hq -vpre ipod640 -b 250k -bt 50k -acodec libfaac -ab 56k -ac 2 -s 480x320 video_out_file.mp4 > output1.txt 2> apperror1.txt");   //webkit compatible

  I am using PHP for executing this command.Could you please help me how to reduce the file size from this 30Mb (nearly to uploaded file size is ok) with same quality.

• correct way to download a mp4 [Audio only] file as a mp3 file via php

  3 février 2018, par Kapil

  I am asking this question because i found it impossible as far my knowledge stands. However i believe here on stackoverflow a lot of genius persons visits so maybe someone can give a good advice / trick.

  My problem is, I am downloading a audio/mp4 file of youtube hosted on googlevideo.com’s server.

  My PHP code for this purpose :
  $mp3path is url of video

  header('Content-Description: File Transfer');
  
  if(strpos($mp3path, "https://") === false) {
  
      header('Content-length: ' . size($mp3path)); //size is custom function
  
  } 
  
      header("Content-Type: audio/MP4A-LATM, audio/MP4A, audio/m4a, audio/mp4, audio/mp4a, audio/mp4-audio, audio/mpeg"); 
  
      header('Content-Type: application/force-download');
  
      header("Accept-Ranges: bytes");
  
      header('Content-Transfer-Encoding: binary'); 
  
      header('Content-disposition: attachment; filename="'.$title.'.mp3"'); 
  
      header('Connection: Keep-Alive');
  
      header('Expires: 0');
  
      header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  
      header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
  
      header("Cache-Control: private", false);
  
      header('Pragma: no-cache');
  
      readfile($mp3path);
  
      exit;

  I can download this audio file but few mp3 players are not able to play it when i did some research on by using mp3val [mp3val.sourceforge.net]. I found this file do not contain sample-rate, bit-rate or some other required codecs inside the file.
  Error received from mp3val : Unknown file format

  I know one possible way of doing this which is ffmpeg but i am looking for a less time consuming option of doing this because first ffmpeg download the whole file and then convert it to mp3 and save it on server. It takes a lot of time.

  I am looking for a easiest solution in which, i dont want to save the whole file on my server. I want to call this file from remote server and want to add sample rate, bit-rate in the file and then just somehow with php i want to start download on browser.

  All i mean to say i need a faster solution. I have seen 2 yt to mp3 converter, They are doing the same thing, giving instant download. i dont know how ?

  Please if you think its a stupid question or not possible then dont report to stackoverflow. I am trying to figure it out that’s why i am asking this question here. I hope you’ll understand my curiosity.

  Thanks,

• Clion is configured with FFMPEG under MAC. Missing LC_ID_DYLIB load command file

  1er juin 2022, par QingGisHan

  cmake_minimum_required(VERSION 3.21)
project(DemoExample)

set(CMAKE_CXX_STANDARD 14)

include_directories(/Users/windy/devlop/ffmpeg/mac_ffmpeg_lib/include)
link_directories(/Users/windy/devlop/ffmpeg/mac_ffmpeg_lib/lib)

add_executable(DemoExample main.cpp)


target_link_libraries(
        DemoExample
        swscale swresample avcodec avutil avdevice avfilter avformat
)


  


  ====================[ Build | DemoExample | Debug ]=============================
/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake --build /Users/windy/devlop/code/CLionProjects/DemoExample/cmake-build-debug --target DemoExample
[1/1] Linking CXX executable DemoExample
FAILED: DemoExample 
: && /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk -mmacosx-version-min=10.15 -Wl,-search_paths_first -Wl,-headerpad_max_install_names  CMakeFiles/DemoExample.dir/main.cpp.o -o DemoExample -L/Users/windy/devlop/ffmpeg/mac_ffmpeg_lib/lib -Wl,-rpath,/Users/windy/devlop/ffmpeg/mac_ffmpeg_lib/lib  -lswscale  -lswresample  -lavcodec  -lavutil  -lavdevice  -lavfilter  -lavformat && :
ld: dylib /Users/windy/devlop/ffmpeg/mac_ffmpeg_lib/lib/libswscale.dylib missing LC_ID_DYLIB load command file '/Users/windy/devlop/ffmpeg/mac_ffmpeg_lib/lib/libswscale.dylib' for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.