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• Stream audio (only) from ffmpeg to Android application

  28 novembre 2016, par Othman Mohammad

  I’m trying to implement a simple system to stream voice from microphone to an Android app.
  To stream, I used the ffmpeg program.
  I tried the following command :

  ffmpeg -ar 48000 -f alsa -i hw:0 -acodec mp2 -b:a 384k -f rtp rtp://127.0.0.1:1234

  and I was able to start the server.

  Then, I used the command :

  ffplay rtp://127.0.0.1:1234

  and everything worked properly.

  Now I need to play this stream in an Android mobile app.

  I saw this code somewhere in stackoverflow :

  Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("rtsp://192.168.0.100"));
  
  startActivity(i);

  but the app crashed, stating that :

  android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=rtp://192.168.0.100:1234

  Can anyone help me with the Android code to play the stream ?
  Plus, am I using the right protocol (RTP) or should I use RTSP ?

  Thank you.

• How to combine multiple videos in android using ffmpeg ?

  23 mai 2023, par Haeiny

  I added dependency to use ffmpeg on Android.

  


  implementation "com.arthenica:mobile-ffmpeg-full:4.4"


  


  And I wanted to combine the videos from the gallery, so I temporarily saved the imported video in the cache directory in the app.

  


  After that, I wrote the following function to take the saved images and merge them using ffmpeg :

  


  
fun mergeVideos(videoPaths: List\): Int {
        val cacheDirectory = this.externalCacheDir
        mergedVideoFile = File(cacheDirectory, "merged_video.mp4").absolutePath

        val command = StringBuilder()
        command.append("ffmpeg")
        for (videoPath in videoPaths) {
            command.append(" -i ").append(videoPath)
        }

        command.append(" -filter_complex ").append("\"")
        for (i in videoPaths.indices) {
            command.append("[$i:v] ").append("[$i:a] ")
        }

        command.append("concat=n=").append(videoPaths.size).append(":v=1:a=1 [v] [a]").append("\"")
        command.append(" -map \"[v]\" -map \"[a]\" ").append(mergedVideoFile)
    
        return FFmpeg.execute(command.toString())
    }


  


  I wanted to temporarily save the merged video in the "mergedVideoFile" so that I could save them in the cache directory, and videoPaths would get the Urls of the videos I wanted to merge into the list.

  


  The command verified through Log.d :

  


  
ffmpeg -i /storage/emulated/0/Android/data/"project name"/files/Movies/VIDEO1.mp4 -i /storage/emulated/0/Android/data/"project name"/files/Movies/VIDEO2.mp4 -filter_complex "\[0:v\] \[0:a\] \[1:v\] \[1:a\] concat=n=2:v=1:a=1 \[v\] \[a\]" -map "\[v\]" -map "\[a\]" /storage/emulated/0/Android/data/"project name"/cache/merged_video.mp4


  


  result of mergeVideos execution :

  


  
Loading mobile-ffmpeg.
Loaded mobile-ffmpeg-full-arm64-v8a-4.4-20210207.
Callback thread started.
ffmpeg version v4.4-dev-416
Copyright (c) 2000-2020 the FFmpeg developers
built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)

configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --extra-libs='-L/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-mediacodec

libavutil      56. 55.100 / 56. 55.100
libavcodec     58. 96.100 / 58. 96.100
libavformat    58. 48.100 / 58. 48.100
libavdevice    58. 11.101 / 58. 11.101
libavfilter     7. 87.100 /  7. 87.100
libswscale      5.  8.100 /  5.  8.100
libswresample   3.  8.100 /  3.  8.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/"project name"/files/Movies/VIDEO1.mp4':

Metadata:
major_brand     :   mp42
minor_version   :   0
compatible_brands:  isommp42
creation_time   :   2023-05-02T12:22:45.000000Z
com.android.version:  11
com.android.capture.fps:  30.000000
Duration:  00:00:02.51  , start:   0.000000  , bitrate:  14232 kb/s

      Stream #0:0

(eng)
: Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 14022 kb/s
, SAR 1:1 DAR 16:9 ,  30 fps, 30 tbr,  90k tbn,  180k tbc   (default)

Metadata:
rotate          :  90
creation_time   : 2023-05-02T12:22:45.000000Z
handler_name    :  VideoHandle
Side data:
displaymatrix: rotation of -90.00 degrees

      Stream #0:1

(eng)
: Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s   (default)

     Metadata:
        creation_time   :   2023-05-02T12:22:45.000000Z
        handler_name    :   SoundHandle

Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/"project name"/files/Movies/VIDEO2.mp4':

... Input #1's video metadatas ...

\[NULL @ 0x78367662e0\] Unable to find a suitable output format for 'ffmpeg'
ffmpeg: Invalid argument


  


  I don't know what is the problem in my code.
Please help me.

  


• How do I convert videos to mp4 for use on Android ? [on hold]

  11 avril 2014, par user3525211

  I am trying to use ffmpeg to convert videos (flv,mov,etc) to mp4 for use on android mobile phones. The conversion seemingly works fine. I can see the mp4s on my iphone. But when I test it out on android phones it does not work. I have been googling this problem for two weeks now and I have tried probably 50 different variations of ffmpeg command lines, but without success. I tried upgrading to the latest ffmpeg on my linux server, but I am not linux savvy and am not sure that it did what it was supposed to. I am at my wits end. Am I going about this wrong ? Is ffmpeg the right tool ? Any ideas ?

  Here is the command line I have used to successfully convert to mp4s that work on iphone :
  ffmpeg -y -i input.mov -s 480x270 -r 30000/1001 -b 128k -vcodec libx264 -vpre slow -vpre ipod320 -acodec libfaac -ac 2 -ar 44100 -ab 128k output.mp4