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• Using FFMpeg on Android to record to a RTMPS target

  4 mai 2017, par pbdev

  We’re building an Android app that streams video to a Wowza server. When using the RTMP protocol everything works but when we change the protocol to RTMPS (and the port number to 443) the recorder stops after a few frames. We tried both endpoints on a MacBook (streaming the build-in webcam) and that just works well so the endpoints are fine.

  rtmp://my.streamlock.net:1935/app/stream
  
  rtmps://my.streamlock.net:443/app/stream

  Here is some of the build.gradle file :

  configurations {
  
      all*.exclude group: 'org.bytedeco', module: 'javacpp-presets'
  
  }
  
  
  
  dependencies {
  
      compile group: 'org.bytedeco', name: 'javacv', version: '1.3.2'
  
      compile 'org.bytedeco.javacpp-presets:opencv:3.2.0-1.3.2:android-arm'
  
      compile 'org.bytedeco.javacpp-presets:opencv:3.2.0-1.3.2:android-x86'
  
  }

  The record method on the FFmpegFrameRecorder instance gets called 30 times per second. After 7 or 8 frames the record method freezes for a minute and then records another 7 or 8 frames. No exceptions are thrown, the app just does ’nothing’. Here are some debugging logs :

  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xcb480000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@63f04a2]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xcb480000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcb480000,deallocatorAddress=0xcdcce000]]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xe952f478,deallocatorAddress=0xcf750090]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xcb100000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@38a8533]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xcb100000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcb100000,deallocatorAddress=0xcdcce000]]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xcad00000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@f0270f0]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xcad00000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcad00000,deallocatorAddress=0xcdcce000]]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xcab00000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@c136669]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xcab00000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcab00000,deallocatorAddress=0xcdcce000]]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xca900000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@bacc8ee]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xca900000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca900000,deallocatorAddress=0xcdcce000]]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xca700000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@3de418f]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xca700000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca700000,deallocatorAddress=0xcdcce000]]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xca500000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@135ac1c]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xca500000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca500000,deallocatorAddress=0xcdcce000]]
  
  D/Recorder: Record method done
  
  D/Recorder: Calling the record method
  
  I/System.out: Predeallocating org.bytedeco.javacpp.BytePointer[address=0xca300000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$2@7f30025]
  
  I/System.out: Registering org.bytedeco.javacpp.BytePointer[address=0xca300000,position=0,limit=921603,capacity=921603,deallocator=org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca300000,deallocatorAddress=0xcdcce000]]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcb100000,deallocatorAddress=0xcdcce000]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca500000,deallocatorAddress=0xcdcce000]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca700000,deallocatorAddress=0xcdcce000]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xca900000,deallocatorAddress=0xcdcce000]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcab00000,deallocatorAddress=0xcdcce000]
  
  I/System.out: Collecting org.bytedeco.javacpp.Pointer$NativeDeallocator[ownerAddress=0xcad00000,deallocatorAddress=0xcdcce000]

  After the NativeDeallocator nothing happens for a minute and then the same repeats. Any help would be greatly appreciated !

• Merge multiple videos to a split-screen video with FFMPEG

  23 mai 2020, par finnk

  I am new to ffmpeg, and I need some help :

  



  I am writing an App that merges multiple videos to a single split-screen video. The user can set the size and position of each video.
I implemented the merging by using a video.js stream merger. This works great on my notebook, but it won't work on older devices, so I decided to do the merging server-side with ffmpeg.
I am struggling to achieve this. I tried it using the xstack, but how can I set the position of each video ?`And how can i tell ffmpeg to enable the audio of each video ? Is it possible to use the xstack in ffmpeg.js ? It would be nice, because it is easier for me to deploy(as a firebase function)
By now i tried it with a fixed amount of input files :

  



  .\ffmpeg -i .\input0.webm -i input1.webm -i .\input2.webm -i .\input3.webm -filte
r_complex "[0:v][1:v][2:v][3:v]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]" -map "[v]"   -map 0:a -map 1:a  -map 2:a -
map 3:a output2.webm


  



  But I need to automate the call based on the user input. This works, but there is no audio, and I can't set the position of each video like I want to.

  



  Update :

  



  This is a snapshot of a possible user input
I just don't know how/If I can use the layout option to make something like this.

  


• FFmpeg watermark is using first frame of video instead of the provided .png

  22 décembre 2020, par SPorridge

  I am trying to use FFmpeg on Windows10 to add a watermark to an existing mp4 video. Using the following command :

  


  ffmpeg -i input.mp4 -i watermark.png -filter_complex "overlay=10:10" output.mp4

  


  The expected result is the watermark.png image is added at position 10x10px throughout the video runtime. Instead, the first frame of input.mp4 is being added picture-in-picture style at that position instead.

  


  Looking through the documentation I am struggling to see how this is happening. When I remove watermark.png from the current directory, I get an error that it cannot be found, so it seems FFmpeg is at least recognising the existence of the .png when it is there.

  


  Thanks in advance for any advice !