Recherche avancée

Sur d’autres sites (3025)

• Looking for a non-FFMPEG/non-Lame Python audio converter for Android [closed]

  1er avril, par Marcelcolt

  So as the title suggests, I'm looking for another way to convert audio.
I am currently using PyTubeFix to download audio from YouTube. That works awesome, but it downloads in M4A.
I would really like it in MP3.

  


  Most converter libraries and packages use FFMPEG. I've tried to download it through Termux and PyDroid3, but that doesn't work. I've tried to compile it for Android with NDK, but I am so lost in what I am supposed to be doing...
Same goes for Lame.
I've been at it for over a week now, but I can't find any other way to convert.

  


  AI only suggests that I write a library of my own, but not HOW to do that (only that I'd have to convert M4A to WAV first and then back to MP3).

  


  So I would love it if someone could point me towards a library or package that doesn't depend on FFMPEG or Lame.

  


  I hope you guys can help !

  


• Debugging Gstreamer pipeline with tee and a filesink in C

  28 septembre 2020, par NicolasBourbaki

  There is an excellent example on how to construct a C program using GStreamer and its tee and filesink elements on https://gist.github.com/crearo/a49a8805857f1237c401be14ba6d3b03.
(Another one can be found on https://gstreamer.freedesktop.org/documentation/tutorials/basic/multithreading-and-pad-availability.html?gi-language=c).

  


  The idea of the tee element in a pipeline is similar like the tee program in Unix : Like a T-shaped tube, it allows to add a bifurcation to a pipeline, which is in my case used to display a video stream to the screen (which works perfectly) and writing it at the same time to a file (which doesn't work - the file is created but stays empty, i.e. has a size of 0 bytes after closing the program).

  


  I deviated from the examples mentioned above by neither having a queue element for recording (because I also don't have one for displaying, which works) as well as neither having an encoder nor a muxer. Although this might be a problem for what gets written to the file in the end, I would expect that there is written something to the file at all.

  


  The program does compile. What additional diagnostics could I run in order to pin down the problem ?

  


• Building ffmpeg libraries for third party usage

  23 mars 2023, par mikeProgrammer

  I am trying to create bindings for FFmpeg in Elixir programming language and would love to handle FFmpeg binaries for users of my library.

  


  The whole flow is as follows :

  


  

  1. Write some function definition in Elixir

  


  2. Implement it in in C using ffmpeg libs

  


  3. Compile C code as shared library

  


  4. When running application, Erlang Virtual Machine will load my dynamic library

  


  


  The question is how to compile and include ffmpeg libs in my shared lib so that users of my Elixir lib don't have to install any native dependencies.

  


  Here is what I was trying :

  


  


  1. Compile ffmpeg libs as shared ones. When my Elixir lib is compiling, it downloads precompiled ffmpeg archive, extracts its content and links to it when compiling native functions. I realized that this still won't work as ffmpeg shared libs depend on other shared libs that user has to install on their own.

     


  


  2. Compile ffmpeg libs as static ones and include them in my native shared library using —whole-archive linker option. Here I am getting

     


  


  


  /usr/bin/ld : ffmpeg_build/lib/libavcodec.a(vp9lpf_16bpp.o) : warning : relocation against ff_pw_1' in read-only section .text'
/usr/bin/ld : ffmpeg_build/lib/libavcodec.a(cavsdsp.o) : relocation R_X86_64_PC32 against symbol `ff_pw_5' can not be used when making a shared object ; recompile with -fPIC
/usr/bin/ld : final link failed : bad value
collect2 : error : ld returned 1 exit status

  


  The command I am using

  


  cc -fPIC -I/home/michal/.asdf/installs/erlang/25.1/erts-13.1/include -Iffmpeg_build/include -Ic_src/xav -shared -DXAV_DEBUG=1 c_src/xav/xav_nif.c c_src/xav/reader.c c_src/xav/utils.c -o /home/michal/Repos/xav/_build/test/lib/xav/priv/libxav.so -Lffmpeg_build/lib -Wl,--whole-archive -lavcodec -lswscale -lavutil -lavformat -Wl,--no-whole-archive


  


  FFmpeg configuration

  


  ./configure \
--prefix="$PWD/ffmpeg_build" \
--extra-cflags="-fPIC -I$PWD/ffmpeg_build/include" \
--extra-ldflags="-L$PWD/ffmpeg_build/lib" \
--enable-pic
--disable-programs


  


  Does anything that I am trying to do make sense to you ?

  


  When I am installing ffmpeg-libs package on Fedora, it depends on other shared libs that are automatically downlaoded but what I would love to achieve is to provide self-contained ffmpeg build that can be used in other shared libraries.