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Sur d’autres sites (15026)
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Ffmpeg library compilation .(without pkg-config) in linux ubuntu
2 novembre 2023, par Mohideen IrfanI have been trying to use ffmpeg libraries in my C code. But when i compile those libraries using pkg-config tool in linux terminal it works. But when i directly linked all the necessary libraries , it won't work. I even specified the library path in -L flag and LD_LIBRARY_PATH. even included the -I flag correctly. But when i use pkg-config it works, if i use directly it wont work. I also export LD_LIBRARY_PATH.


here is my C program Sample.c :


#include 
#include <libavformat></libavformat>avformat.h>


int main(int argc, char *argv[]) {
 if (argc < 2) {
 printf("Please provide a video file as an argument.\n");
 return -1;
 }

// av_register_all();

 AVFormatContext *pFormatCtx = NULL;
 if (avformat_open_input(&pFormatCtx, argv[1], NULL, NULL) != 0) {
 printf("Could not open the file.\n");
 return -1;
 }

 if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
 printf("Could not find stream information.\n");
 return -1;
 }

 av_dump_format(pFormatCtx, 0, argv[1], 0);

 avformat_close_input(&pFormatCtx);

 return 0;
}


here is the package file of libavformat.pc :


prefix=/home/mohideen-ts205/ffmpeg_build
exec_prefix=${prefix}
libdir=/home/mohideen-ts205/ffmpeg_build/lib
includedir=/home/mohideen-ts205/ffmpeg_build/include

Name: libavformat
Description: FFmpeg container format library
Version: 60.17.100
Requires: libavcodec >= 60.32.102, libswresample >= 4.13.100, libavutil >= 58.30.100
Requires.private: 
Conflicts:
Libs: -L${libdir} -lavformat -lm -latomic -lz -lgnutls -pthread -lgmp -lunistring -lidn2 -latomic -lhogweed -lgmp -lnettle -ltasn1 -lp11-kit
Libs.private: 
Cflags: -I${includedir}


libavutil.pc :


prefix=/home/mohideen-ts205/ffmpeg_build
exec_prefix=${prefix}
libdir=/home/mohideen-ts205/ffmpeg_build/lib
includedir=/home/mohideen-ts205/ffmpeg_build/include

Name: libavutil
Description: FFmpeg utility library
Version: 58.30.100
Requires: 
Requires.private: 
Conflicts:
Libs: -L${libdir} -lavutil -pthread -lva-drm -lva -lva-x11 -lva -lvdpau -lX11 -lm -lva -latomic -lX11 -lpthread -lxcb -lXau -lXdmcp
Libs.private: 
Cflags: -I${includedir}


And here the command :
with pkg config- working one :


gcc -o sample sample.c $(pkg-config --libs libavutil libavformat libavcodec)


without it directly linking :


gcc -o my_program -I/home/mohideen-ts205/ffmpeg_build/include -L/home/mohideen-ts205/ffmpeg_build/lib -lavformat


NOTE : I even tried to copy all the library files mentioned in libavutil.pc and libavformat.pc, but still i am getting this undefined reference error. what kind of problem it is.


/usr/bin/ld: /tmp/ccoCfZjA.o: in function `main':
sample.c:(.text+0x63): undefined reference to `avformat_open_input'
/usr/bin/ld: sample.c:(.text+0x8b): undefined reference to `avformat_find_stream_info'
/usr/bin/ld: sample.c:(.text+0xc3): undefined reference to `av_dump_format'
/usr/bin/ld: sample.c:(.text+0xcf): undefined reference to `avformat_close_input'
collect2: error: ld returned 1 exit status


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ffmpeg stucks after each song
11 juin 2017, par HalfbaxWhen I start to stream to youtube, it works fine. Until the first song is over. After it the stream is in a loop of the last 20 seconds. I dont know why. The next song wont ever streamed.
The audio stream is lag-free. <- tested
case $1 in
start)
# VLC audio stream
su vlc -c "screen -dmS $VLC_PID_NAME cvlc --random /home/music/chill/*.mp3 --sout '#transcode{vcodec=none,acodec=mp3,ab=128}:standard{access=http,mux=raw,dst=localhost:8080/live.ogg}'"
sleep 2
# FFMPEG
# Static image + vlc audio stream
screen -dmS $FFMPEG_PID_NAME ffmpeg -loop 1 -framerate 2 -i '/home/forest.jpg' -i 'http://localhost:8080/live.ogg' -s "$INRES" -r "$FPS" -f alsa -ac 2 -vcodec libx264 -s "$OUTRES" -g 2 -acodec libmp3lame -b:a 128k -b:v 200k -ar 44100 -threads 0 -preset:v "$QUAL" -f flv "rtmp://a.rtmp.youtube.com/live2/$STREAM_KEY"
;; -
Unable to execute CLI commands through PHP
13 janvier 2012, par user940154OS : ubuntu 11.10
Webserver : Apache
Code : PHP
I am trying to display the output of command "ffmpeg -i " on the webpage using php.
Required : The webpage should show the information about video (text).
Whats happening : The webpage shows no text output on running the php code.
If I was however doing system("ls") the code runs fine and outputs the list of files.
Here's my code<?php
echo "Details of video file:";
system('ffmpeg -i /home/atish/Videos/T2V0040006_Angled_ride_720x576i_FLDCMB.avi');
?>The same command works fine on my shell, and my system has ffmpeg installed. Here's a snapshot of executing this command directly on shell :
ThinkPad-T420:~/Videos$ ffmpeg -i /home/xx/Videos/T2V0040006_Angled_ride_720x576i_FLDCMB.avi
ffmpeg version git-2012-01-10-7e2ba2d Copyright (c) 2000-2012 the FFmpeg developers
built on Jan 10 2012 12:01:19 with gcc 4.6.1
configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore- amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab
libavutil 51. 34.100 / 51. 34.100
libavcodec 53. 54.100 / 53. 54.100
libavformat 53. 29.100 / 53. 29.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 58.100 / 2. 58.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
libpostproc 51. 2.100 / 51. 2.100
Input #0, avi, from '/home/atish/Videos/T2V0040006_Angled_ride_720x576i_FLDCMB.avi':
Metadata:
encoder : Lavf52.23.1
Duration: 00:00:29.00, start: 0.000000, bitrate: 124422 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x576, 25 tbr, 25 tbn, 25 tbc
At least one output file must be specifiedI have tried appending "DISPLAY=:0" to my command and also done "xhost +" before running php code, but nothing is helping me out.
Thanks.
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