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• FFMPEG command for audio file streaming

  27 septembre 2013, par Vigo

  I am trying to stream an audio file in mp3 format using the FFMPEG library to a remote computer, located on the same LAN as the sender. The command i used to stream at the sender is given below :

  ffmpeg -re -f mp3 -i sender.mp3 -ar 8000 -f mulaw -f rtp rtp://10.14.35.23:1234

  I got the below command on FFMPEG documentation page that generates audio and streams it to port number 1234 on remote computer

  ffmpeg -re -f lavfi -i aevalsrc="sin(400*2*PI*t)" -ar 8000 -f mulaw -f rtp rtp://10.14.35.23:1234

  I thought i had made relevant changes to this so that the mp3 streaming command will work, but only to know encounter the error which reads
  "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height"

  Can anyone tell me what is the wrong parameter here and how to rectify it ?

• Using FFmpeg in .net ?

  15 juillet 2016, par daniel

  So I know its a fairly big challenge but I want to write a basic movie player/converter in c# using the FFmpeg library. However, the first obstacle I need to overcome is wrapping the FFmpeg library in c#. I’ve downloaded ffmpeg but couldn’t compile it on Windows, so I downloaded a precompiled version for me. Ok awesome. Then I started looking for C# wrappers.

  I have looked around and have found a few wrappers such as SharpFFmpeg (http://sourceforge.net/projects/sharpffmpeg/) and ffmpeg-sharp (http://code.google.com/p/ffmpeg-sharp/). First of all, I wanted to use ffmpeg-sharp as its LGPL and SharpFFmpeg is GPL. However, it had quite a few compile errors. Turns out it was written for the mono compiler, I tried compiling it with mono but couldn’t figure out how. I then started to manually fix the compiler errors myself, but came across a few scary ones and thought I’d better leave those alone. So I gave up on ffmpeg-sharp.

  Then I looked at SharpFFmpeg and it looks like what I want, all the functions P/Invoked for me. However its GPL ? Both the AVCodec.cs and AVFormat.cs files look like ports of avcodec.c and avformat.c which I reckon I could port myself ? Then not have to worry about licencing.

  But I want to get this right before I go ahead and start coding. Should I :

  1. Write my own C++ library for interacting with ffmpeg, then have my C# program talk to the C++ library in order to play/convert videos etc.

  OR

  2. Port avcodec.h and avformat.h (is that all i need ?) to c# by using a whole lot of DllImports and write it entirely in C# ?

  First of all consider that I’m not great at C++ as I rarely use it but I know enough to get around. The reason I’m thinking #1 might be the better option is that most FFmpeg tutorials are in C++ and I’d also have more control over memory management than if I was to do it in c#.

  What do you think ?
  Also would you happen to have any useful links (perhaps a tutorial) for using FFmpeg ?

• How to use FFmpeg compression methods in our own C project ?

  29 février 2016, par Sir DrinksCoffeeALot

  I’m currently working on compressing video data on one port and sending it to another port where the data will be decompressed. I would like to try LZW compression method. I’m using pretty old and outdated FFmpeg build (only .h, .lib, .dll files). Problem is that i don’t have any headers to include to get access to LZW encoder and decoder.

  Idea is to open video file, split it into frames, compress them using one of the methods and send them to some remote location where they will be decompressed and concencated into video file.