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• ffmpeg -hls_time option not working correctly when running as a service

  4 février 2019, par aexposito

  I am running a ffmpeg command as a systemd service to catch a live RTSP stream and generate hls chunks, the chunks are set to be 30 seconds long with the -hls_time option, when I run the command on the console myself it works ok, but when it runs from the service chunks, wish are supposed to be 30 seconds long are 7 or 8 seconds.
  This is the command :

  /usr/bin/ffmpeg -rtsp_flags prefer_tcp -i
  "rtsp ://192.168.1.16:554/user=admin&password=&channel=1&stream=1.sdp"
  -acodec copy -vcodec copy -hls_time 30 -hls_list_size 10 -hls_flags append_list+delete_segments -f hls -use_localtime 1
  -hls_segment_filename "/home/zurikato/video-backup/$FILENAME_FORMAT_hls.ts"
  /home/zurikato/video-backup/playlist.m3u8

  I’m a beginner in ffmpeg and linux services, so please indulge me if it is a simple matter.
  Thanks in advance

• ffmpeg live streaming for twitch has audio delay

  8 avril 2019, par ILoveCake

  I am relatively new to ffmpeg and live streaming.
  Trying to overlay some videos and an audio stream.
  One of the audio streams is delayed for about 2 seconds.

  Here are the details :

  stream 0 : video : a static background image

  stream 1 : video : an area of the screen recorded

  stream 2 : video : webcam video

  stream 3 : audio : webcam audio

  AREA_X=1024; AREA_Y=576; OFFSET_X=110; OFFSET_Y=145
  
  
  
  ffmpeg \
  
    -async 1 -vsync 1 \ 
  
    -loop 1 -i /home/helmi/Documents/Streaming.Chess.png \
  
    -thread_queue_size 512 -f x11grab -s ${AREA_X}x${AREA_Y} -framerate 25 -async 1 -vsync 1 -i :0.0+${OFFSET_X},${OFFSET_Y} \
  
    -thread_queue_size 512 -f v4l2 -framerate 25 -video_size 160x120 -i /dev/video0 \
  
    -thread_queue_size 512 -f pulse -ac 2 -ar 48000 -i default \
  
    -filter_complex \
  
    "color=0x336699cc:1024x64, drawtext=textfile=/home/helmi/Documents/Streaming.Chess.txt:fontfile=/home/helmi/.fonts/PersonalUse_Clipper_Script_fat.ttf:x=10:y=16:fontsize=40:fontcolor=white [bottom]; \
  
     [1:v]scale=960:-1,setpts=PTS-STARTPTS [a]; \
  
     [0:v]setpts=PTS-STARTPTS [0v]; \
  
     [0v][a]overlay=15:15 [b]; \
  
     [b][2:v]overlay=(W-w):0 [c]; \
  
     [c][bottom]overlay=0:H-64 [video]" \
  
     -map "[video]" -map "3:a" \
  
      -async 1 -vsync 1 \ 
  
      -c:v libx264 -b:v 500k -maxrate 500k -bufsize 1000k -framerate 25 -crf 17 -preset superfast -pix_fmt yuv420p -tune zerolatency \
  
        -force_key_frames "expr:gte(t,n_forced*2)" \
  
      -c:a aac -b:a 256k -ac 2 -af "aresample=async=1" \
  
    -f flv rtmp://live-vie.twitch.tv/app/...

  Am I missing something here ? Any help is appreciated.

• Unable to execute CLI commands through PHP

  13 janvier 2012, par user940154

  OS : 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 specified

  I have tried appending "DISPLAY=:0" to my command and also done "xhost +" before running php code, but nothing is helping me out.

  Thanks.