Recherche avancée

Sur d’autres sites (18436)

• Problem while building libffmpeg.so from ffmpeg sources (undefined symbol : avcodec_version)

  10 octobre 2023, par serggt1

  I'm trying to build libffmpeg.so shared library from sources on Linux. Sources are here FFmpeg.git.

  


  I run

  


  ./configure
make -j4

gcc -shared \
    libavcodec/libavcodec.a \
    libavdevice/libavdevice.a \
    libavfilter/libavfilter.a \
    libavformat/libavformat.a \
    libavutil/libavutil.a \
    libswresample/libswresample.a \
    libswscale/libswscale.a \
    -o libffmpeg.so


  


  The problem is the resulting libffmpeg.so is only 15 KB and says

  


  dlsym fail : /opt/yandex/browser/libffmpeg.so: undefined symbol: avcodec_version


  


  What do I wrong and how to link the library in correct way ?

  


  UPD :

  


  Now trying with this :

  


  ./configure --enable-pic --disable-programs  --enable-gpl --enable-version3 --enable-nonfree

make -j4

ld \
    -rpath-link=/usr/lib \
    -L/usr/lib \
    -L/lib \
    --library=c --library=m --library=z --library=dl --library=log \
    -soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined \
    libavcodec/libavcodec.a \
    libavdevice/libavdevice.a \
    libavfilter/libavfilter.a \
    libavformat/libavformat.a \
    libavutil/libavutil.a \
    libswresample/libswresample.a \
    libswscale/libswscale.a \
    -o libffmpeg.so


  


  Error is ld: cannot find -lc: No such file or directory

  


• Shell Script for passing multiple audio sources as arguments to a script that uses ffmpeg for recording video/audio ? [duplicate]

  29 novembre 2023, par Raul Chiarella

  I have the following Shell/Bash Script, that records video with audio in my Linux :

  


  #!/bin/bash

# Command to record audio from one microphone and video from one webcam
ffmpeg_cmd="ffmpeg -f video4linux2 -s 320x240 -i /dev/video0 -f alsa -ac 1 -i hw:1,0 -acodec libmp3lame -ab 96k camera.mp4"

# Execute the command
echo "Executing: $ffmpeg_cmd"
eval $ffmpeg_cmd


  


  This one works... But now :

  


  What I want is to be able to execute this Bash/Shell script passing multiple audio sources parameters and changing if video is going to be recorded or not (Video 1 Enabled, Video 0 Disabled), for example, using ./recordVideo.sh -a "audio1,audio2" -v 1...

  


  I tried recording a video accepting multiple audio sources arguments and passing it to FFMPEG using the following script :

  


  #!/bin/bash

# Default variables
audio_sources=""
video_flag=0

# Function to display help
usage() {
    echo "Usage: $0 -a 'Microphone1,Microphone2' -v 1"
    echo "  -a : List of audio sources, separated by commas"
    echo "  -v : Video flag (1 to record video, 0 not to record)"
    exit 1
}

# Parse arguments
while getopts "a,v" opt; do
  case $opt in
    a) audio_sources=$OPTARG ;;
    v) video_flag=$OPTARG ;;
    *) usage ;;
  esac
done

# Check if audio arguments were provided
if [ -z "$audio_sources" ]; then
    echo "Error: Audio sources not specified."
    usage
fi

# Initial ffmpeg command configuration
cmd="ffmpeg"

# Counter for source mapping
source_count=0

# Audio settings
IFS=',' read -ra ADDR <<< "$audio_sources"
for source in $ADDR; do
    cmd+=" -f alsa -ac 1 -i $source"
    cmd+=" -map $source_count"
    ((source_count++))
done

# Video settings
if [ "$video_flag" -eq 1 ]; then
    cmd+=" -f video4linux2 -s 320x240 -i /dev/video0 -map $source_count"
    ((source_count++))
fi

# Audio codec configuration
cmd+=" -acodec libmp3lame -ab 96k"

# Output file name
cmd+=" recordedVideo.mp4"

# Execute command
echo "Executing: $cmd"
eval $cmd


  


  But it is throwing the following error when I execute ./recordVideo.sh -a 'Microphone1,Microphone2' -v 1 :

  


  


  Error : Audio sources not specified.
Usage : ./recordVideo.sh -a 'Microphone1,Microphone2' -v 1
-a : List of audio sources, separated by commas
-v : Video flag (1 to record video, 0 not to record)

  


  


  Can someone help me ? :(
What am I doing wrong ? Is it the Shell Syntax or FFMPEG arguments that are wrong ?

  


• avcodec/vvcdec : bdof, do not pad sources and gradients to simplify the code

  20 août 2024, par Nuo Mi

  avcodec/vvcdec : bdof, do not pad sources and gradients to simplify the code
  

  • [DH] libavcodec/vvc/dsp.c
  • [DH] libavcodec/vvc/dsp.h
  • [DH] libavcodec/vvc/inter_template.c