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• Inserting image to video as a watermark using FFMPEG on Android phone

  4 octobre 2018, par Deepak Prasad

  I was trying to add an image to video as a watermark on android phone.
  I am using below command.

  String [] complexCommand = {"ffmpeg","-i","/storage/emulated/0/Vd/sample.mp4","-i",
  
                      "/storage/emulated/0/Vd/icon.png","-filter_complex","overlay=10:main_h-overlay_h-10","/storage/emulated/0/Vd/out.mp4"};

  But it’s giving me the error.

  D/FFmpeg: Failed 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
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Vd/sample.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2avc1mp41
  
          creation_time   : 1970-01-01 00:00:00
  
          encoder         : Lavf53.24.2
  
        Duration: 00:00:05.31, start: 0.000000, bitrate: 1589 kb/s
  
          Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1205 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
          Metadata:
  
            creation_time   : 1970-01-01 00:00:00
  
            handler_name    : VideoHandler
  
          Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 384 kb/s (default)
  
          Metadata:
  
            creation_time   : 1970-01-01 00:00:00
  
            handler_name    : SoundHandler
  
      Input #1, png_pipe, from '/storage/emulated/0/Vd/icon.png':
  
        Duration: N/A, bitrate: N/A
  
          Stream #1:0: Video: png, rgba(pc), 96x96 [SAR 3779:3779 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
  
      [NULL @ 0x42303a60] Unable to find a suitable output format for 'ffmpeg'
  
      ffmpeg: Invalid argument

  Both the source video and source image, I have stored on the android phone under some path. And I am using that complete path.

  Thanks.

• FFmpeg video filters corrupt mp4 file

  12 septembre 2018, par kataroty

  I am trying to add visual filters to mp4 files using FFmpeg.

  I have tried many filters, but 4 of them worked out of which only 1 worked worked perfectly. I am using them in an Android application, but I tried the same command lines on windows cmd using FFmpeg and the result is same. With 3 filters the .mp4 is unplayable by many players and also Androids mediaplayer. I can still play the "corrupt" files on VLC and players that have many codex`s, but I need them to work perfectly.

  The only filter working as intended is Black and White and the command is (have tried both -vf and -filter_complex) :

  -i origin.mp4 -filter_complex hue=s=0 blackWhite.mp4

  The other 3 are Sepia, Vintage and Negative

  "colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131",  "curves=vintage", "curves=negative"

  Since I cannot upload video files here, I have added a link of 3 files, the original video file, black/white filtered file (that works), vintage file (that does not work).

  Dropbox - video files link

• How to setup a virtual mic and pipe audio to it from node.js

  28 octobre 2018, par Niellles

  Summary of what I am trying to achieve :

  I’m currently doing some work on a Discord bot. I’m trying to join a voice channel, which is the easy part, and then use the combined audio of the speakers in that voice channel as input for a webpage in a web browser. It doesn’t really matter which browser it is as long as it can be controlled with Selenium.

  ---

  What I’ve tried/looked into so far

  My bot so far is written up in Python using the discord.py API wrapper. Unfortunately listening to, as opposed to putting in, audio hasn’t been exactly implemented great − let alone documented − with discord.py. This made me decide to switch to node.js (i.e. discord.js) for the voice channel stuff of my bot.

  After switching to discord.js it was pretty easy to determine who’s talking and create an audio stream (PCM stream) for that user. For the next part I though I’d just pipe the audio stream to a virtual microphone and select that as the audio input on the browser. You can even use FFMPEG from within node.js ¹, to get something that looks like this :

  const Discord = require("discord.js");
  
  const client = new Discord.Client();
  
  
  
  client.on('ready', () => {
  
    voiceChannel = client.channels.get('SOME_CHANNEL_ID');
  
    voiceChannel.join()
  
      .then(conn => {
  
        console.log('Connected')
  
  
  
        const receiver = conn.createReceiver();
  
  
  
        conn.on('speaking', (user, speaking) => {
  
          if (speaking) {
  
            const audioStream = receiver.createPCMStream(user);
  
  
  
            ffmpeg(stream)
  
                .inputFormat('s32le')
  
                .audioFrequency(16000)
  
                .audioChannels(1)
  
                .audioCodec('pcm_s16le')
  
                .format('s16le')
  
                .pipe(someVirtualMic);          
  
          }
  
        });
  
      })
  
      .catch(console.log);
  
    }); 
  
  
  
  client.login('SOME_TOKEN');

  This last part, creating and streaming to a virtual microphone, has proven to be rather complicated. I’ve read a ton of SO posts and documentation on both The Advanced Linux Sound Architecture (ALSA) and the JACK Audio Connection Kit, but I simply can’t figure out how to setup a virtual microphone that will show up as a mic in my browser, or how to pipe audio to it.

  Any help or pointers to a solution would be greatly appreciated !

  ---

  Addendum

  For the past couple of days I’ve kept on looking into to this issue. I’ve now learned about ALSA loopback devices and feel that the solution must be there.

  I’ve pretty much followed a post that talks about loopback devices and aims to achieve the following :

  Simply imagine that you have a physical link between one OUT and one
  IN of the same device.

  I’ve set up the devices as described in the post and now two new audio devices show up when selecting a microphone in Firefox. I’d expect one, but I that may be because I don’t entirely understand the loopback devices (yet).

  The loop back devices are created and I think that they’re linked (if I understood the aforementioned article correctly). Assuming that’s the case the only problem I have to tackle is streaming the audio via FFMPEG from within node.js.