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• Mix 2 mp3 files with FFmpeg for Android

  24 mai 2017, par Thankgod Richard

  I am developing something similar to a karaoke app. I have a sound file(beat) and a recorded file(voice) from android mediarecorder. I am trying to mix the two files to become one file that plays the same time. I have set up ffmpeg provided by writingminds and everything is working fine. I am not familiar with ffmpeg commands so searched for and got few commands that can achieve the task for me. This is the code i got :

    String files = "-i " + currentFile + " -i " + someFile.getAbsolutePath();
  
              String output = mFileName + "/recorded/test.mp3";
  
              String cmd = "ffmpeg "+files+
  
                      " -filter_complex \"aevalsrc=0:d=10[s1];[s1][1:a]concat=n=2:v=0:a=1[ac1];[0:a][ac1]amix[aout]\" -map [aout] -c:a libmp3lame " + output;

  But it not working. this is the error i got :

  04-01 12:09:26.598 21300-21300/com.shixels.thankgodrichard.mixer I/fpeg: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
                                                                             built with gcc 4.8 (GCC)
  
                                                                             configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
                                                                             libavutil      55. 17.103 / 55. 17.103
  
                                                                             libavcodec     57. 24.102 / 57. 24.102
  
                                                                             libavformat    57. 25.100 / 57. 25.100
  
                                                                             libavdevice    57.  0.101 / 57.  0.101
  
                                                                             libavfilter     6. 31.100 /  6. 31.100
  
                                                                             libswscale      4.  0.100 /  4.  0.100
  
                                                                             libswresample   2.  0.101 /  2.  0.101
  
                                                                             libpostproc    54.  0.100 / 54.  0.100
  
                                                                           Output #0, mp3, to 'ffmpeg -i /storage/emulated/0/MyStudio/temps/1491044929409.mp3 -i /storage/emulated/0/temp.mp3 -filter_complex "aevalsrc=0:d=10[s1];[s1][1:a]concat=n=2:v=0:a=1[ac1];[0:a][ac1]amix[aout]" -map [aout] -c:a libmp3lame /storage/emulated/0/recorded/test.mp3':
  
                                                                           Output file #0 does not contain any stream
  
  04-01 12:09:26.599 21300-21300/com.shixels.thankgodrichard.mixer I/fpeg: finished

  I read some answers here saying it depends on the version of the ffmpeg your using. I am using the latest ffmpeg for android by writingminds.

• Nginx Live transcoding with ffmpeg

  9 juillet 2017, par Stian Tofte

  I’m live streaming video to my server(It’s external somewhere in the world).
  And what I’m trying to do here, is that my server will transcode the input to a lower bitrate before it pushes it to the video site like twitch and so on.

  And I’m doing this on windows. I have tried to google around watched youtube videos. and so on.. But couldn’t find any solution for it. So here is what I have at this moment(not working).

  In my nginx.conf :

  rtmp {
  
  server {
  
      listen 1935;
  
      chunk_size 8192;
  
  
  
      application code {
  
          live on;
  
  
  
      }
  
  
  
      application twitch {
  
          push rtmp://live-ams.twitch.tv/app/live_xxxxxxxxxxxxxxxxx;
  
      }
  
  }

  So here the application code is receving the stream from my computer at home. I’m using ffmpeg to transcode it.

  And here is my batch file(That I have to start manualy. Can’t start it within the config of nginx on windows.)

  ffmpeg -i rtmp://localhost/code -vcodec flv -acodec copy -s 1280x720 -f flv rtmp://localhost/twitch
  
  pause

  Right now It’s just downscaling but that is okay. So this is supposed to send the stream back to the "twitch" application in my nginx config. And then nginx will stream it to twitch.

  But when I launch my ffmpeg bat file.. I get this :
  

  So it’s here my road ends. Anyone knows how to do this ?

  Thanks in advance :) Stian

• Recording usb cam on raspberry pi with ffmpeg - usb troubleshooting

  18 septembre 2017, par Hwy2Hell

  I want to save video from an external usb cam on the raspberry pi 3. In order to avoid voltage drop issues, I use the offical raspberry power supply (2.5 Amp) and connected all usb devices by a separetely powered usb hub :

  pi@raspi:~/appdev/ffmpeg $ lsusb
  
  Bus 001 Device 037: ID 046d:09a1 Logitech, Inc. QuickCam Communicate MP/S5500
  
  Bus 001 Device 036: ID 046d:c03f Logitech, Inc. M-BT85 [UltraX Optical Mouse]
  
  Bus 001 Device 035: ID 04d9:1503 Holtek Semiconductor, Inc. Shortboard Lefty
  
  Bus 001 Device 012: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB
  
  Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
  
  Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. 
  
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

  When I try to test the functionality by running the following bash script (snippet) :

  function capture
  
  {
  
      capfile=$(date +%F_%Hh%Mm%Ss)
  
      echo saving to $wdir/$capfile.mp4
  
      echo $PATH
  
      ffmpeg -video_size 320x240 -i /dev/video0 \
  
      -vf drawtext="fontsize=18:x=10:y=220:fontcolor=red:\
  
      fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf:\
  
      text=%{localtime}" -t 10 $wdir/$capfile.mp4
  
      # change -t to 3600 = 1h
  
  }
  
  
  
  for i in $(seq 1 10)
  
  do
  
      echo
  
      echo Pass $i ...
  
      capture
  
  done

  After a few loop-runs I always see device errors :

  Pass 5 ...
  
  saving to /home/pi/appdev/ffmpeg/2017-09-16_13h31m00s.mp4
  
  /usr/local/bin:/usr/bin/ffmpeg:/usr/bin:/bin:/sbin
  
  ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration: --arch=armhf --target-os=linux --enable-gpl --enable-libfreetype --enable-mmal --enable-nonfree --enable-omx --enable-omx-rpi
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  /dev/video0: Input/output error

  The kernel message log shows that the usb cam has been resetted :

  pi@raspi:~/appdev/ffmpeg $ dmesg | grep usb
  
  [ 4497.358195] usb 1-1.2.4: new high-speed USB device number 37 using dwc_otg
  
  [ 4497.573440] usb 1-1.2.4: New USB device found, idVendor=046d, idProduct=09a1
  
  [ 4497.573466] usb 1-1.2.4: New USB device strings: Mfr=0, Product=0, SerialNumber=2
  
  [ 4497.573481] usb 1-1.2.4: SerialNumber: A032D310
  
  [ 4497.605698] input: UVC Camera (046d:09a1) as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.4/1-1.2.4:1.0/input/input15
  
  [ 4497.625582] usb 1-1.2.4: Warning! Unlikely big volume range (=3072), cval->res is probably wrong.
  
  [ 4497.625606] usb 1-1.2.4: [5] FU [Mic Capture Volume] ch = 1, val = 4608/7680/1
  
  [ 5268.123764] usb 1-1.2.4: reset high-speed USB device number 37 using dwc_otg

  Next time I start the script, the usb cam gets disconnected and /dev/viedo0 disappears :

  pi@raspi:~/appdev/ffmpeg $ dmesg | grep usb
  
  [ 5621.216896] usb 1-1.2.4: USB disconnect, device number 37
  
  [ 5621.586804] usb 1-1.2.4: new full-speed USB device number 38 using dwc_otg
  
  [ 5621.686694] usb 1-1.2.4: device descriptor read/64, error -32
  
  [ 5621.896583] usb 1-1.2.4: device descriptor read/64, error -32
  
  [ 5622.106572] usb 1-1.2.4: new full-speed USB device number 39 using dwc_otg
  
  [ 5622.206574] usb 1-1.2.4: device descriptor read/64, error -32
  
  [ 5622.416577] usb 1-1.2.4: device descriptor read/64, error -32
  
  [ 5622.626586] usb 1-1.2.4: new full-speed USB device number 40 using dwc_otg
  
  [ 5623.046583] usb 1-1.2.4: device not accepting address 40, error -32
  
  [ 5623.146583] usb 1-1.2.4: new full-speed USB device number 41 using dwc_otg
  
  [ 5623.566603] usb 1-1.2.4: device not accepting address 41, error -32
  
  [ 5623.566670] usb 1-1.2-port4: unable to enumerate USB device

  Has anybody experienced similar problems and can provide a fix for it ?

  What tools can I use to troubleshoot the usb communication on the pi ?