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• ExoPlayer FFMPEG can't find native libraries

  28 janvier 2021, par Cilenco

  I'm currently developing an application using the ExoPlayer library which needs ffmpeg support. I was able to build the ffmpeg extension from the ExoPlayer repo fine by following the readme. I then build an aar with :

  


  ./gradlew :extension-ffmpeg:assembleRelease


  


  I included the aar into my project and enabled the the extension through the DefaultRenderersFactory but when I load my app I get following lines in the log :

  


  W/LibraryLoader: Failed to load [avutil, swresample, avcodec, ffmpeg jni)
I/DefaultRenderersFactory: Loaded Ffmpeg AudioRenderer.


  


  According to the troubleshooting post, this is because the native parts of the library could not be loaded. Unfortunately I have no experience with Android native development so I'm not sure where to find the native parts of the library and how to add them to my application ?

  


  With the demo app it works fine !

  


• How to find index of input files in ffmpeg ?

  30 décembre 2016, par Nikita

  I am using the below FFMPEG command for a scenario where i need 2 files as input and 2 output files. applying text overlay in 1st output file and image overlay in the other.
  In this scenario we need index of the file upon which overlay has to be provided, as highlighted in yellow :

  ffmpeg -i "Input0.mxf" -i Input1.png -i "Input2.mxf" -filter_complex
  "[0:0:v]split=1[input1] ;[2:0:v]split=1[input2] ;[input1]drawtext=’fontfile=/Windows/Fonts/arial.ttf:fontsize=70:fontcolor=white@0.8:text=’Title
  of this Video’:x=10 :
  y=10’[output1] ;[input2]overlay=main_w-overlay_w-10:10[output2]" -map
  "[output1]" -c:v libx264 -preset ultrafast -q:a 6 output1.mov -map
  "[output2]" -c:v libx264 -preset ultrafast -q:a 6 output2.mov

  The inputs are dynamic and can come in any sequence. So I need to apply overlays to particular file which ever user specifies.
  So, I need to know is there any way which can automate this file indexing i.e. according to filename/aliasing(if possible), if I can find the index of that input file .?
  Any workaround is also welcomed.
  Thanks in advance.

• How to parse WMV (ASF) file ? Can't find length of data packets

  9 mars 2018, par bukkojot

  I try to parse WMV (ASF) files without any SDK, just by decoding raw bytes. Now I have problem with ASF_Data_Object, where I can’t find length of data packet. More precise, Single payload data packet.

  See image :
  

  Here I have 9 packets, but unable to find size of individual packet. How I can determine border between packets ?

  I think, my problem at byte 0x411, where field "Length type flags". As you can see, here 0 value, so all flags are zero. Even Packet Length Type.

  
  

  Yes, 0 value here allowed here. But how to read this type of content ?

  This is now compressed payload, as replication data is 8, not 1. So, this is single payload without additional fields of size.

  Sample of WMV file : https://files.catbox.moe/b51l2j.wmv