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• how to use x264 dll in another project

  7 février 2024, par Hadi Rasekh

  I want to use x264 in my project. There is some line in the code said :

  


  `/* Application developers planning to link against a shared library version of

  


  

  • libx264 from a Microsoft Visual Studio or similar development environment

  


  • will need to define X264_API_IMPORTS before including this header.

  


  • This clause does not apply to MinGW, similar development environments, or non

  


  • Windows platforms. */`

  


  


  But I don't get this line :
define X264_API_IMPORTS before including this header

  


  We can create x264 dll by its configuration and make

  


      ./configure --enable-shared
    make


  


  but I can not use the dll in my Qt Project.

  


  I can make my own dll (in another code) and use it in the project.
But when I start to use x264 dll in my project I get the following error :

  


      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
    'pulldown_frame_duration' was not declared in this scope
    qDebug() << pulldown_frame_duration[1];
             ^


  


• How to get full name of default microphone ?

  9 août 2019, par Jiapeng Li

  Been trying to get full name of microphone as a variable on Python for usage of ffmpeg. I have already tried

  p = pyaudio.PyAudio()
  
  default_device = p.get_default_input_device_info()
  
  print(default_device['name'])

  and here was the output :

  Microphone (Conexant SmartAudio         #it was truncated to 31 characters length

  Obviously,that was truncated and not what i wanted.
  Tried sounddevice too :

  import sounddevice as sd
  
  s = sd.query_devices()
  
  print(s)

  Output :

     0 Microsoft Sound Mapper - Input, MME (2 in, 0 out)
  
  >  1 Microphone (Conexant SmartAudio, MME (2 in, 0 out)           #still truncated
  
     2 Microsoft Sound Mapper - Output, MME (0 in, 2 out)
  
  <  3 Speakers (Conexant SmartAudio H, MME (0 in, 2 out)
  
     4 Primary Sound Capture Driver, Windows DirectSound (2 in, 0 out)
  
     5 Microphone (Conexant SmartAudio HD), Windows DirectSound (2 in, 0 out)    #now got normal,but why?
  
     6 Primary Sound Driver, Windows DirectSound (0 in, 2 out)
  
     7 Speakers (Conexant SmartAudio HD), Windows DirectSound (0 in, 2 out)
  
     8 Speakers (Conexant SmartAudio HD), Windows WASAPI (0 in, 2 out)
  
     9 Microphone (Conexant SmartAudio HD), Windows WASAPI (2 in, 0 out)
  
    10 Stereo Mix (Conexant HD Stereo Mix), Windows WDM-KS (2 in, 0 out)
  
    11 Microphone (Conexant HD Audio capture), Windows WDM-KS (2 in, 0 out)
  
    12 Speakers (Conexant HD Audio output), Windows WDM-KS (0 in, 2 out)

  It can be seen that device number 1 was my default one and if that was full name it would be perfect but unfortunately that was not.

  Then the only thing i could have thought of was to capture full name from list that ffmpeg provided :

  'ffmpeg -list_devices true -f dshow -i dummy':
  
  [dshow @ 000001cc4f298d00] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 000001cc4f298d00]  "USB2.0 VGA UVC WebCam"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_pnp_\\?\usb#vid_13d3&pid_5a07&mi_00#6&2f27e633&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 000001cc4f298d00]  "screen-capture-recorder"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{4EA69364-2C8A-4AE6-A561-56E4B5044439}"
  
  [dshow @ 000001cc4f298d00] DirectShow audio devices
  
  [dshow @ 000001cc4f298d00]  "Microphone (Conexant SmartAudio HD)"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{AFE404CD-A721-49BE-8AC5-669DA725185F}"
  
  [dshow @ 000001cc4f298d00]  "virtual-audio-capturer"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E146464-DB61-4309-AFA1-3578E927E935}"

  I used

  popen = subprocess.Popen('ffmpeg -list_devices true -f dshow -i dummy', stdout=subprocess.PIPE)
  
  popen.wait()
  
  
  
  lines = popen.stdout.readlines()
  
  print(lines)

  After that i got totally confused because the output was an empty list. Now i am lost in desert and know nowhere to go. Really appreciate it if you could help.

• ffmpeg says : "option framerate not found"

  29 novembre 2018, par Jason

  Good afternoon.

  I’ve been trying to use ffmpeg to split a .mpeg into a sequence of .jpeg images. Please note that this is the inverse problem of the one specified here, but the problem I’m facing is not the same as the problem the author of that thread is facing.

  Specifically, I have tried all the following mpeg codecs available in my ffmpeg installation :

  DEV D  ffv1            FFmpeg video codec #1
  
  DEVSD  ffvhuff         Huffyuv FFmpeg variant
  
  DEVSDT mpeg1video      MPEG-1 video
  
  D V DT mpeg1video_vdpau MPEG-1 video (VDPAU acceleration)
  
  D V D  mpeg2_crystalhd MPEG-2 Video (CrystalHD acceleration)
  
  DEVSDT mpeg2video      MPEG-2 video
  
  DEVSDT mpeg4           MPEG-4 part 2
  
  D V D  mpeg4_crystalhd MPEG-4 Part 2 (CrystalHD acceleration)
  
  D V DT mpeg4_vdpau     MPEG-4 part 2 (VDPAU)
  
  D VSDT mpegvideo       MPEG-1 video
  
  D V DT mpegvideo_vdpau MPEG-1/2 video (VDPAU acceleration)
  
  D VSDT mpegvideo_xvmc  MPEG-1/2 video XvMC (X-Video Motion Compensation)
  
  DEVSD  msmpeg4         MPEG-4 part 2 Microsoft variant version 3
  
  D V D  msmpeg4_crystalhd MPEG-4 Part 2 Microsoft variant version 3 (CrystalHD acceleration)
  
  D VSD  msmpeg4v1       MPEG-4 part 2 Microsoft variant version 1
  
  DEVSD  msmpeg4v2       MPEG-4 part 2 Microsoft variant version 2

  I’ve tried supplying ffmpeg with all different codecs to try to split an input .mpeg video file with 2548 frames into 2548 .jpegs, by using the -vcodec option :

  ffmpeg -r 2548 -i frames.mpeg frames_%06d.jpg -vcodec $codec

  where $codec is any codec among the ones listed above, e.g. ffv1, mpeg4, etc. However, all my efforts result in the following error :

  [NULL @ 0x1948f20] Value 4707126720094797824.000000 for parameter 'probesize' out of range
  
  [NULL @ 0x1948f20] Value 4707126720094797824.000000 for parameter 'analyzeduration' out of range
  
  [NULL @ 0x1948f20] Value 4697254411347427328.000000 for parameter 'indexmem' out of range
  
  [NULL @ 0x1948f20] Value 4703785510416416768.000000 for parameter 'rtbufsize' out of range
  
  [NULL @ 0x1948f20] Value -4616189618054758400.000000 for parameter 'fpsprobesize' out of range
  
  [NULL @ 0x1948f20] Value 4607182418800017408.000000 for parameter 'f_err_detect' out of     range
  
  [NULL @ 0x1948f20] Value 4607182418800017408.000000 for parameter 'err_detect' out of range
  
  Option framerate not found.  

  Which is weird, because I’ve actually specified the frame rate parameter through the -r switch. I googled a bit and it appears that this error was mentioned approximately a year and a half ago on the ffmpeg bug tracker but that information makes little sense to me because it’s relevant to the devs. Curiously, if I interchange the position of the parameters and put -r after -i or even after -vcodec, the error message changes to :

  [NULL @ 0x24abf20] Value 4707126720094797824.000000 for parameter 'probesize' out of range
  
  [NULL @ 0x24abf20] Value 4707126720094797824.000000 for parameter 'analyzeduration' out of range
  
  [NULL @ 0x24abf20] Value 4697254411347427328.000000 for parameter 'indexmem' out of range
  
  [NULL @ 0x24abf20] Value 4703785510416416768.000000 for parameter 'rtbufsize' out of range
  
  [NULL @ 0x24abf20] Value -4616189618054758400.000000 for parameter 'fpsprobesize' out of  range
  
  [NULL @ 0x24abf20] Value 4607182418800017408.000000 for parameter 'f_err_detect' out of  range
  
  [NULL @ 0x24abf20] Value 4607182418800017408.000000 for parameter 'err_detect' out of range
  
  [NULL @ 0x24b23c0] Value 4686111960511545344.000000 for parameter 'b' out of range
  
  [NULL @ 0x24b23c0] Value 4683532506232782848.000000 for parameter 'ab' out of range
  
  [NULL @ 0x24b23c0] Value 4705844345939427328.000000 for parameter 'bt' out of range
  
  [NULL @ 0x24b23c0] Value 4617315517961601024.000000 for parameter 'me_method' out of range
  
  [NULL @ 0x24b23c0] Value 4622945017495814144.000000 for parameter 'g' out of range
  
  [NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter 'qmin' out of range
  
  [NULL @ 0x24b23c0] Value 4629418941960159232.000000 for parameter 'qmax' out of range
  
  [NULL @ 0x24b23c0] Value 4613937818241073152.000000 for parameter 'qdiff' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'wpredp' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'bug' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'er' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'err_detect' out of range
  
  [NULL @ 0x24b23c0] Value 4613937818241073152.000000 for parameter 'ec' out of range
  
  [NULL @ 0x24b23c0] Value 4620693217682128896.000000 for parameter 'ildctcmp' out of range
  
  [NULL @ 0x24b23c0] Value 4620693217682128896.000000 for parameter 'subq' out of range
  
  [NULL @ 0x24b23c0] Value 4696837138094751744.000000 for parameter 'ibias' out of range
  
  [NULL @ 0x24b23c0] Value 4696837138094751744.000000 for parameter 'pbias' out of range
  
  [NULL @ 0x24b23c0] Value 4642507528377204736.000000 for parameter 'lmin' out of range
  
  [NULL @ 0x24b23c0] Value 4660262442142531584.000000 for parameter 'lmax' out of range
  
  [NULL @ 0x24b23c0] Value 4696130710463840256.000000 for parameter 'flags2' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'threads' out of range
  
  [NULL @ 0x24b23c0] Value 4620693217682128896.000000 for parameter 'nssew' out of range
  
  [NULL @ 0x24b23c0] Value -4586705114244317184.000000 for parameter 'profile' out of range
  
  [NULL @ 0x24b23c0] Value -4586705114244317184.000000 for parameter 'level' out of range
  
  [NULL @ 0x24b23c0] Value 4623507967449235456.000000 for parameter 'skipcmp' out of range
  
  [NULL @ 0x24b23c0] Value 4642507528377204736.000000 for parameter 'mblmin' out of range
  
  [NULL @ 0x24b23c0] Value 4660262442142531584.000000 for parameter 'mblmax' out of range
  
  [NULL @ 0x24b23c0] Value 4643211215818981376.000000 for parameter 'mepc' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'bidir_refine' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'cqp' out of range
  
  [NULL @ 0x24b23c0] Value 4627730092099895296.000000 for parameter 'keyint_min' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'refs' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'directpred' out of range
  
  [NULL @ 0x24b23c0] Value 4618441417868443648.000000 for parameter 'sc_factor' out of range
  
  [NULL @ 0x24b23c0] Value 4643211215818981376.000000 for parameter 'mv0_threshold' out of range
  
  [NULL @ 0x24b23c0] Value 4630826316843712512.000000 for parameter 'b_sensitivity' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'compression_level' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'min_prediction_order' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'max_prediction_order' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'prediction_order_method' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'min_partition_order' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'max_partition_order' out of range
  
  [NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter 'ticks_per_frame' out of range
  
  [NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter 'color_primaries' out of range
  
  [NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter 'color_trc' out of range
  
  [NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter 'colorspace' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'aq_mode' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'rc_lookahead' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'lpc_type' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'lpc_passes' out of range
  
  [NULL @ 0x24b23c0] Value 4613937818241073152.000000 for parameter 'thread_type' out of range
  
  [NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter 'request_sample_fmt' out of range
  
  frames.mpeg: could not find codec parameters

  I’m at a loss as to what to do with this problem, and am looking for some assistance.

  Kind regards,

  Jason