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• ffmpeg doesn't work when the script is launched by cron - No protocol specified, Cannot open display :0.0

  14 janvier 2024, par a k

  ffmpeg in my script doesn't work when the script is launched by cron of the root

  


  Error : No protocol specified, Cannot open display :0.0

  


  OS : Ubuntu 20.04

  


  #!/bin/bash
log=/var/log/log2/log2.txt

echo ______________ $(date) >> "$log"
echo "$""DISPLAY" "=      "  "$DISPLAY" >> "$log" ;
echo whoami '         ' $(whoami) >> "$log" 
echo pwd '            ' $(pwd) >> "$log" 
echo "$""USER" "=" '        ' "$USER" >> "$log"
echo PATH '           ' "$PATH" >> "$log"
echo which ffmpeg '   ' $(which ffmpeg)>> "$log" 
echo whereis ffmpeg ' ' $(whereis ffmpeg) >> "$log" 
echo "\nls -l /bin/* | grep ffmpeg" '        ' >> "$log"
ls -l /usr/bin/* | grep ffmpeg >> "$log"
echo "ls -l /var/log | grep log2" ' '>> "$log"
ls -l /var/log | grep log2 >> "$log"

ffmpeg -y -f x11grab -s 1366x768 -i :0.0 -r 25 /var/log/log2/test.mp4 -loglevel error 2>>"$log" &

echo "pid ffmpeg ""$""!"" = " "$!" >> "$log" 
sleep 5
kill "$!"
echo exit >> "$log"
exit


  


  When Cron (Cron of the root) launches the script, ffmpeg shows the error "No protocol specified, Cannot open display :0.0"

  


  /var/log/log2/log2.txt :

  


  ______________ ven. 05 mai 2023 04:10:01 CEST
$DISPLAY =       
whoami           root
pwd              /root
$USER =          
PATH             /usr/bin:/bin
which ffmpeg     /usr/bin/ffmpeg
whereis ffmpeg   ffmpeg: /usr/bin/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
ls -l /usr/bin/* | grep ffmpeg  
-rwxr-xr-x 1 root   root      284976 mai   18  2022 /usr/bin/ffmpeg
ls -l /var/log | grep log2  
drwxrwxrwx  2 root              root               4096 mai    5 04:09 log2
pid ffmpeg $! =  74590
No protocol specified
[x11grab @ 0x56244aa06740] Cannot open display :0.0, error 1.
:0.0: Input/output error
exit


  


  When I launch the script manually as a not-root user (with sudo), everything work correctly :

  


  ______________ ven. 05 mai 2023 04:10:47 CEST
$DISPLAY =       :0
whoami           root
pwd              /home/an
$USER =          root
PATH             /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
which ffmpeg     /usr/bin/ffmpeg
whereis ffmpeg   ffmpeg: /usr/bin/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
ls -l /usr/bin/* | grep ffmpeg  
-rwxr-xr-x 1 root   root      284976 mai   18  2022 /usr/bin/ffmpeg
ls -l /var/log | grep log2  
drwxrwxrwx  2 root              root               4096 mai    5 04:09 log2
pid ffmpeg $! =  74618
exit


  


  When I launch the script manually as the root, everything works correctly :

  


  ______________ ven. 05 mai 2023 04:11:27 CEST
$DISPLAY =       :0
whoami           root
pwd              /root
$USER =          root
PATH             /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
which ffmpeg     /usr/bin/ffmpeg
whereis ffmpeg   ffmpeg: /usr/bin/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
ls -l /usr/bin/* | grep ffmpeg  
-rwxr-xr-x 1 root   root      284976 mai   18  2022 /usr/bin/ffmpeg
ls -l /var/log | grep log2  
drwxrwxrwx  2 root              root               4096 mai    5 04:11 log2
pid ffmpeg $! =  74683
exit


  


  When crontab of an ordinary user launches the script, it works correctly :

  


  $DISPLAY =       
whoami           an
pwd              /home/an
$USER =          
PATH             /usr/bin:/bin
which ffmpeg     /usr/bin/ffmpeg
whereis ffmpeg   ffmpeg: /usr/bin/ffmpeg /usr/share/ffmpeg /usr/share/man/man1/ffmpeg.1.gz
ls -l /usr/bin/* | grep ffmpeg  
-rwxr-xr-x 1 root   root      284976 mai   18  2022 /usr/bin/ffmpeg
ls -l /var/log | grep log2  
drwxrwxrwx  2 root              root               4096 mai    5 05:05 log2
pid ffmpeg $! =  77601
exit


  


  I have tried to put into the script :

  


  export DISPLAY=":0"

  


  export DISPLAY=":0.0"

  


  export DISPLAY=":1"

  


• How can I resolve the FileNotFoundError when attempting to convert an MP3 to WAV using ffmpeg in Python ?

  3 juin 2023, par avocado123123

  I have an MP3 file that I want to convert into a WAV file, but no matter how I try writing the code, it keeps raising FileNotFoundError on the MP3 file and warns me about the installation of FFmpeg.

  


  my code :

  


  from pydub import AudioSegment

# Specify the path to the FFmpeg executable
ffmpeg_path = r"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffmpeg.exe"
AudioSegment.ffmpeg = ffmpeg_path
AudioSegment.ffprobe = ffmpeg_path

# Load the MP3 file
mp3_file = r"C:\Users\תמרה\Tea Time - Ofshane.mp3"
audio = AudioSegment.from_file(mp3_file, format="mp3")

# Export as WAV
wav_file = r"C:\Users\תמרה\Tea Time - Ofshane.wav"
audio.export(wav_file, format="wav")


  


  when running :

  


  C:\Users\תמרה\PycharmProjects\spotify\venv\Scripts\python.exe "C:\Users\תמרה\PycharmProjects\spotify\file stuff.py" C:\ffmpeg-2023-05-29-git-45fa85a777-full_build\bin\ffmpeg.exe &#xA;C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\utils.py:170: RuntimeWarning: Couldn&#x27;t find ffmpeg or avconv - defaulting to ffmpeg, but may not work&#xA;  warn("Couldn&#x27;t find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)&#xA;C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\utils.py:198: RuntimeWarning: Couldn&#x27;t find ffprobe or avprobe - defaulting to ffprobe, but may not work&#xA;  warn("Couldn&#x27;t find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)&#xA;Traceback (most recent call last):&#xA;  File "C:\Users\תמרה\PycharmProjects\spotify\file stuff.py", line 12, in <module>&#xA;    audio = AudioSegment.from_file(mp3_file, format="mp3")&#xA;  File "C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\audio_segment.py", line 728, in from_file&#xA;    info = mediainfo_json(orig_file, read_ahead_limit=read_ahead_limit)&#xA;  File "C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\utils.py", line 274, in mediainfo_json&#xA;    res = Popen(command, stdin=stdin_parameter, stdout=PIPE, stderr=PIPE)&#xA;  File "C:\Users\תמרה\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 971, in __init__&#xA;True&#xA;    self._execute_child(args, executable, preexec_fn, close_fds,&#xA;  File "C:\Users\תמרה\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 1440, in _execute_child&#xA;    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,&#xA;FileNotFoundError: [WinError 2] The system cannot find the file specified&#xA;&#xA;Process finished with exit code 1&#xA;&#xA;</module>

  


  What should I do to make this work ?

  


• Capture video with pulse audio on a second camera with motioneye [closed]

  8 mai 2023, par Damien JALLON

  On a raspberrypi 4, bullseye os, motioneye service capture motion with camera on /dev/video0 and launch this script that capture video with pulse audio on a second camera on /dev/video2 :

  


  echo $USER >> /home/damien/motion_ffmpeg.log
cd /home/damien
source /home/damien/.profile
source /home/damien/.bashrc
file="/home/damien/Vidéos/motionEye/motionEye_$(date +%Y%m%d_%H%M%S).mp4" # Création d'un nom de fichier horodaté
/usr/bin/ffmpeg -f pulse -thread_queue_size 4096 -ac 1 -channel_layout mono -i default -f v4l2 -thread_queue_size 4096 -i /dev/video2 -t 00:00:03 -vcodec mpeg4 $file >> /home/damien/motion_ffmpeg.log  2>&1 < /dev/null & 


  


  The script work perfectly in standalone, in a terminal connected with the user "damien".
The log produce in standalone :

  


  


  damien ffmpeg version 4.3.6-0+deb11u1+rpt1 Copyright (c) 2000-2023 the
FFmpeg developers built with gcc 10 (Debian 10.2.1-6)
  
configuration : —prefix=/usr —extra-version=0+deb11u1+rpt1
—toolchain=hardened —incdir=/usr/include/aarch64-linux-gnu —enable-gpl —disable-stripping —enable-avresample —disable-filter=resample —enable-gnutls —enable-ladspa —enable-libaom —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libcodec2 —enable-libdav1d —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable-libjack —enable-libmp3lame —enable-libmysofa —enable-libopenjpeg —enable-libopenmpt —enable-libopus —enable-libpulse —enable-librabbitmq —enable-librsvg —enable-librubberband —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libsrt —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx265 —enable-libxml2 —enable-libxvid —enable-libzmq —enable-libzvbi —enable-lv2 —enable-omx —enable-openal —enable-opencl —enable-opengl —enable-sdl2 —disable-mmal —enable-neon —enable-v4l2-request —enable-libudev —enable-epoxy —enable-sand —libdir=/usr/lib/aarch64-linux-gnu —arch=arm64 —enable-pocketsphinx —enable-libdc1394 —enable-libdrm —enable-vout-drm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libx264 —enable-shared
  
libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libavresample 4. 0. 0 /
4. 0. 0 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100
Input #0, pulse, from 'default' :
Duration : N/A, start : 1683539947.001243, bitrate : 768 kb/s
Stream #0:0 : Audio : pcm_s16le, 48000 Hz, mono, s16, 768 kb/s Input #1, video4linux2,v4l2, from '/dev/video2' : Duration : N/A, start : 675.690589, bitrate : 147456 kb/s
Stream #1:0 : Video : rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc Stream
mapping : Stream #1:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
  
Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native)) Press [q] to
stop, [?] for help Output #0, mp4, to
'/home/damien/Vidéos/motionEye/motionEye_20230508_115906.mp4' :
  
Metadata :
encoder : Lavf58.45.100
Stream #0:0 : Video : mpeg4 (mp4v / 0x7634706D), yuv420p(progressive), 640x480, q=2-31, 200 kb/s, 30 fps, 15360 tbn, 30
tbc
Metadata :
encoder : Lavc58.91.100 mpeg4
Side data :
cpb : bitrate max/min/avg : 0/0/200000 buffer size : 0 vbv_delay : N/A
Stream #0:1 : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s
Metadata :
encoder : Lavc58.91.100 aac frame= 90 fps= 67 q=4.6 Lsize= 275kB time=00:00:03.00 bitrate= 750.5kbits/s dup=51 drop=0
speed=2.23x video:245kB audio:26kB subtitle:0kB other streams:0kB
global headers:0kB muxing overhead : 1.611457% [aac @ 0x55b808d2b0]
Qavg : 126.380

  


  


  The motioneye service is launched under the user "damien".
The log of the script executed by motioneye when motion is detected :

  


  


  damien ffmpeg version 4.3.6-0+deb11u1+rpt1 Copyright (c) 2000-2023 the
FFmpeg developers built with gcc 10 (Debian 10.2.1-6)
  
configuration : —prefix=/usr —extra-version=0+deb11u1+rpt1
—toolchain=hardened —incdir=/usr/include/aarch64-linux-gnu —enable-gpl —disable-stripping —enable-avresample —disable-filter=resample —enable-gnutls —enable-ladspa —enable-libaom —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libcodec2 —enable-libdav1d —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable-libjack —enable-libmp3lame —enable-libmysofa —enable-libopenjpeg —enable-libopenmpt —enable-libopus —enable-libpulse —enable-librabbitmq —enable-librsvg —enable-librubberband —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libsrt —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx265 —enable-libxml2 —enable-libxvid —enable-libzmq —enable-libzvbi —enable-lv2 —enable-omx —enable-openal —enable-opencl —enable-opengl —enable-sdl2 —disable-mmal —enable-neon —enable-v4l2-request —enable-libudev —enable-epoxy —enable-sand —libdir=/usr/lib/aarch64-linux-gnu —arch=arm64 —enable-pocketsphinx —enable-libdc1394 —enable-libdrm —enable-vout-drm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libx264 —enable-shared
  
libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libavresample 4. 0. 0 /
4. 0. 0 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100
default : No such process

  


  


  The message "default : No such process" seems to mean that there is no connection with the pulse server.

  


  Why does ffmpeg not connect to pulse server when launched by motioneye ?