Recherche avancée

Sur d’autres sites (9039)

• FFmpeg avformat_open_input not working : Invalid data found when processing input

  2 novembre 2016, par John_Sheares

  This is my first time using FFmpeg. Every type of media file that I try to open with avformat_open_input, returns "Invalid data found when processing input". I am using 32bit FFmpeg Build Version : 92de2c2. I setup my VS2015 project according to this answer : Use FFmpeg in Visual Studio. What could be going wrong with this code ?

  #include "stdafx.h"
  
  #include 
  
  
  
  extern "C"
  
  {
  
      #include "libavcodec/avcodec.h"
  
      #include <libavformat></libavformat>avformat.h>
  
      #include <libavutil></libavutil>avutil.h>
  
  }
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      AVFormatContext *pFormatCtx = NULL;
  
      avcodec_register_all();
  
  
  
      const char* filename = "d:\\a.mp4";
  
      int ret = avformat_open_input(&amp;pFormatCtx, filename, NULL, NULL);
  
      if (ret != 0) {
  
          char buff[256];
  
          av_strerror(ret, buff, 256);
  
          printf(buff);
  
          return -1;
  
      }
  
  }

• Cross compile ffmpeg for Tizen

  6 avril 2022, par lbegue

  Im trying to compile ffmpeg for Tizen TV as a static library using toolchains.
This is the script I'm using :

  


  #!/bin/bash
function buildme
{

./configure --prefix=$PREFIX                    \
                --target-os=linux                 \
                --arch=$ARCH                        \
                --cpu=armv7-a                        \
                --enable-runtime-cpudetect          \
                --disable-doc                       \
                --disable-ffmpeg                    \
                --disable-ffplay                    \
                --enable-cross-compile              \
                --enable-optimizations              \
                --disable-ffprobe                   \
                --disable-devices                   \
                --disable-avdevice                  \
                --disable-debug                     \
                --enable-pic                        \
                --disable-shared                    \
                --enable-gpl                        \
                --enable-static                     \
                --sysroot=/path-to-tizen-studio/tools/arm-linux-gnueabi-gcc-6.2/arm-tizen-linux-gnueabi \
                --cross-prefix=${PLATFORM}/bin/$PLATFORM_PREFIX \
                --extra-cflags="-O3 -std=c++11 -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums  -fno-strict-aliasing -finline-limit=300 -fpic $OPTIMIZE_CFLAGS"               \
                --enable-asm                        \
                --extra-ldflags="-Wl,-rpath-link=$PLATFORM/lib -L$PLATFORM/lib -nostdlib" \
                --cc=${CCOMPILER} \
                $ADDITIONAL_CONFIGURE_FLAG

   make clean
   make  V=1
   make install
}

echo configuring....

PLATFORM=/path-to-tizen-studio/tools/arm-linux-gnueabi-gcc-6.2
PREFIX='pwd'/thridParty
PLATFORM_PREFIX=arm-linux-gnueabi-
ARCH=arm
CCOMPILER=${PLATFORM}/bin/arm-linux-gnueabi-g++
OPTIMIZE_CFLAGS="-marm"
buildme

echo end


  


  And I obtain this error :

  


  


  /path-to-tizen-studio/tools/arm-linux-gnueabi-gcc-6.2/arm-tizen-linux-gnueabi/include/c++/6.2.1/arm-tizen-linux-gnueabi/bits/os_defines.h:39:22 :
fatal error : features.h : No such file or directory
#include

  


  


• How to use v4l2 scrcpy virtual webcam ?

  2 mars 2024, par Emma bundy

  I created a virtual camera v4l2 /dev/video21 and linked it to my notebook's default webcam /dev/video1 and it started working so far ok, then I mirrored the webcam I created in OBS-studio.

  


  and now I want to connect in scrcpy the virtual camera that I created that is active /dev/video21, but I don't know how to do that, what commands to give to use the v4l2 /dev/video21 camera from the computer on my cell phone.

  


  which is already mirrored on the computer screen via wireless

  


  I need help, who can help me I thank you immensely ! This is for my college studies

  


  I tried to do this several times but I couldn't, I use Fedora 37 gnome, I used ffmpeg to link the webcam /dev/video1 + /dev/video21, and I mirrored it in OBS-studio, but I don't know which command to give to send the /dev/video21 video stream to my cell phone, use the virtual camera created on the cell phone.