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• VB.NET : How to maintain main form control during loops in other sub ?

  5 février 2015, par Zed Machine

  I have a program with only one form.
  By pressing a button it starts a ffmpeg conversion.

  In the main form, in textboxes, ffmpeg stats are outputted. This is possible by taking StandardError output from ffmpeg.

  Public Sub Console()
  
          Dim Process As New Process 
  
  
  
          Process.StartInfo.UseShellExecute = False
  
          Process.StartInfo.RedirectStandardError = True
  
          Process.StartInfo.RedirectStandardOutput = True 
  
          Process.StartInfo.FileName = current_ffmpeg_path 
  
          Process.StartInfo.Arguments = input_params 
  
          Process.StartInfo.CreateNoWindow = True 
  
          Process.Start() 
  
  
  
          Dim ffmpeg_stats_output As System.IO.StreamReader = Process.StandardError
  
  
  
          Do While Process.HasExited = False
  
          [update all main form textboxes by taking input string from ffmpeg and elaborate it]
  
          Loop
  
  End Sub

  The problem is that while this loop is executed the textboxes and progress bar are updated but the main form cannot be modified. There is in fact no control at all by user. So if I want to make a button to stop/pause ffmpeg in main form this cannot be pressed as anything else on the main form.

  there is a way to maintain loops inside other Sub without loose control of main form while they’re running ?

  I tried to fix it by calling another dialog form with textboxes and progress bar. But even this form loose completely control until the process is finished.

  To send pause/stop conversion to ffmpeg (that runs without a window) is it correct use :

  Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
  
  SendKeys.Send("q")
  
  SendKeys.Send("^s") 
  
  End Sub

  or must be specified that this key is sent to the current running Process ?

• ffmpeg link errors when building on iPhone 4.3 SDK

  12 septembre 2011, par YuzaKen

  After a rather trying few days, I finally got ffmpeg to compile under Xcode 4 with SDK 4.3. The issue no is a series (39) link errors. They fall into at least two cases : assembly language routines and static arrays defined in header files. My believe is that it is generating C method names for the assembly routines while the .c files containing the reference to the routine is generating a different method name (munging).

  Undefined symbols for architecture armv7 :

    "_ff_vector_fmul_vfp", referenced from:
  
        _ff_dsputil_init_vfp in libavcodec.a(dsputil_init_vfp.o)
  
    "_main", referenced from:
  
        start in crt1.3.1.o
  
    "_av_solve_lls", referenced from:
  
        _ff_lpc_calc_coefs in libavcodec.a(lpc.o)
  
    "_ff_inv_aanscales", referenced from:
  
        _dct_quantize_trellis_c in libavcodec.a(mpegvideo_enc.o)
  
        _decode_frame in libavcodec.a(eamad.o)
  
        _tgq_decode_frame in libavcodec.a(eatgq.o)
  
        _tqi_decode_frame in libavcodec.a(eatqi.o)
  
    "_ff_add_pixels_clamped_armv6", referenced from:
  
        _ff_dsputil_init_armv6 in libavcodec.a(dsputil_init_armv6.o)
  
    "_ff_cga_palette", referenced from:
  
        _tmv_decode_frame in libavcodec.a(tmv.o)
  
    "_ff_svq1_inter_multistage_vlc", referenced from:
  
        _encode_block in libavcodec.a(svq1enc.o)
  
        _svq1_decode_init in libavcodec.a(svq1dec.o)
  
    "_ff_simple_idct_armv6", referenced from:
  
        _ff_dsputil_init_armv6 in libavcodec.a(dsputil_init_armv6.o)
  
    "_BZ2_bzDecompressInit", referenced from:
  
        _matroska_decode_buffer in libavformat.a(matroskadec.o)
  
    "_ff_put_pixels8_y2_arm", referenced from:
  
        _ff_put_pixels16_y2_arm in libavcodec.a(dsputil_init_arm.o)
  
        _dsputil_init_arm in libavcodec.a(dsputil_init_arm.o)
  
    "_ff_simple_idct_add_armv6", referenced from:

  ...and so on.

  Anyone with experience with ffmpeg on iPhone ? Successfully ?

• ffmpeg mp3 to mp4 with image compatible with iphone [duplicate]

  3 mai 2016, par neoDev

  This question already has an answer here :

  • ffmpeg file conversion unreadable [closed]
    
    1 answer
    

  I need to convert an mp3 to mp4 with image using ffmpeg from my OSX command line.

  I already installed last version of ffmpeg (3.0.2), and tried the following command as described here

  ./ffmpeg -loop 1 -i test.jpg -i test.mp3 -c:a copy -c:v libx264 -shortest test.mp4

  but the result mp4 file is not compatible with my iphone 5

  Now this is what I am trying

  ./ffmpeg -loop 1 -i test.png -i test.mp3 -profile:v baseline -level 3.0 test.mp4

  but I get the error

  Error while opening encoder for output stream #0:0 - maybe incorrect
  parameters such as bit_rate, rate, width or height