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• Supporting all video formats in android

  4 novembre 2014, par Amanni

  I am building an app which allows users to upload videos from different devices including android and iOS then stream them from server with VideoView during playback. I end up with different video formats and get the inevitable "Cannot play this video" error on several occasions.

  Some research says that videos with format .mp4 and codec H.264 can work on all devices, so I have a few things I am working on.

  1. Convert all videos on server side to the above mentioned format and codec
  2. Use ffmpeg to convert the videos in app during playback
  3. Use VLC sdk which supports a wide range of video formats

  I am not sure which if these is the best solution, I have not worked with videos a lot in the past on Android and I am not sure what the pros and cons maybe or if indeed these are viable solutions or if this problem already has a known solution.

• Grab audio samples with ffmpeg and C, error with official example code

  31 août 2020, par nji9

  For dev with mingw-w64 I'm using ffmpeg v. 4.3.1. and also the latest Git version of ffmpeg (Zeranoe's Windows 64 builds).

  


  I get "strange" problems when running the official example code for decoding audio

  


  https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_audio.c

  


  MP3DirectCut(Lib-bass).mp3

  


  http://www.mediafire.com/file/ozmjjcpwyhhdnr7/MP3DirectCut(Lib-bass).mp3/file

  


  Generates pcm, but outputs :

  


  "Warning: the sample format the decoder produced is planar (s16p).
This example will output the first channel only."


  


  But the output pcm has both channels !??

  


  When recoding the above mp3 to wav with ffmpeg (4.1.4, no error message)

  


  http://www.mediafire.com/file/gcq7ryg43pd57q5/ffmpeg4.1.4.wav/file

  


  and also when recoding the latter to mp3 again

  


  http://www.mediafire.com/file/ij865dkrprn2lta/ffmpeg4.1.4_recode.mp3/file

  


  the example code breaks and produces these error messages :

  


  avcodec_send_packet ()&#xA;from within:&#xA;"[mp2 @ <someaddress>] Header missing"&#xA;and returns error code -1094995529&#xA;(= "Invalid data found when processing input")&#xA;</someaddress>

  


  It produces that error message for literally all other formats
I tried, and also when written with another editor (Audition 3.0).
But all the files play and show fine on all programs I have.

  


  I'm at a lost at this point.
What is going on and wrong here ?

  


• Révision 21860 : Le Dari (http://fr.wikipedia.org/wiki/Dari) est aussi une langue rtl

  10 décembre 2014, par kent1 -