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• How to concatenate multiple video files with a single audio file using ffmpeg ?

  17 avril 2020, par IDimension

  Here is how i concatenate mp4 files :

  



  ffmpeg -i vid1.mp4 -i vid2.mp4 -i vid3.mp4 -filter_complex [0][1][2]concat=n=3:v=1:a=0 -vcodec libx264 -preset fast -r 30 output_vid.mp4


  



  But i am unable to figure out to add a audio file as background music to the whole concatenated video.

  


• Blackmagic Deck Link Quad 2 and Multiple Streams with FFmpeg

  23 juin 2018, par SpacePirateRob

  I am trying to accomplish streaming videos from 4 or more feeds on a local display from a DeckLink Quad 2 using FFmpeg as my transcoder. I can play two different videos (I only have two sources I can use simultaneously at my desk) fine, but struggle with connecting them into a single video if they are both on the DeckLink. The code I have for a single stream run as a .bat is below...

  ffplay  -video_size 1280x720 -framerate 60 -pixel_format uyvy422 -f dshow -i video="Decklink Video Capture" \ pause

  Reading most forums it would seem that sticking them together with a complex filter should work, as such :

  ffmpeg -video_size 1280x720 -pixel_format uyvy422 -framerate 60 -vsync drop -f dshow -rtbufsize 150M -i video="Decklink Video Capture (5)" -i video="Decklink Video Capture" -i video="Decklink Video Capture (5)" -i video="Decklink Video Capture" -an -filter_complex "[0:v][1:v]hstack[t]; [2:v][3:v]hstack[b]; [t][b]vstack" -c:v libx264 -preset ultrafast -f mpegts pipe: | ffplay pipe: -vf scale=1280:720 \ pause

  And, with two videos not from the DeckLink (i.e. DeckLink and file), it does work ! But with both coming from the DeckLink I get the following in the console :

  Input #0, dshow, from 'video=Decklink Video Capture (5)':0B f=0/0
  
    Duration: N/A, start: 71582788.354257, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (HDYC / 0x43594448), uyvy422(tv), 1280x720, 60 fps, 60 tbr, 10000k tbn, 10000k tbc
  
  video=Decklink Video Capture: No such file or directory
  
  pipe:: Invalid data found when processing inputKB sq=    0B f=0/0

  And that stream works running on its own too. So my optimistic concern is just that I’m using the wrong naming scheme ; my only other idea is that I can’t read two streams from the DeckLink card simultaneously (though I feel like I’ve read I can). Another concern is introduced here too : one of my streams does not run with frame rate set to 60fps, I need to set it to 59.94fps to work, otherwise it is a black screen.

  Would I need to split these into multiple processed to run each stream simultaneously, save them to a temporary file or a pipeline, then combine them in another stream to display ? I am concerned about the latency that program would introduce though. Thank you in advance !

• ffmpeg static link in Visual Studio [duplicate]

  24 avril 2019, par iz25

  This question already has an answer here :

  • What is an undefined reference/unresolved external symbol error and how do I fix it ?
    
    33 answers
    

  I have build ffmpeg static library on Windows. It seems that everything completed with success. The result of build are following files :

  libavcodec.a
  
  libavdevice.a
  
  libavfilter.a
  
  libavformat.a
  
  libavutil.a
  
  libswscale.a

  I tried to specify above files in Linker->Input in my C++ libray project, but linking fails. Following is build output :

  1>libavutil.a(samplefmt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(error.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(avstring.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(bprint.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavformat.a(id3v2.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(opt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(dict.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(pixdesc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(ratecontrol.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(qsv.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavformat.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavformat.a(aviobuf.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(ffv1enc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(exif.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_img_wrap
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_version_str
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_version_str
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_build_config
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_build_config
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_err_to_string
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_error
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_error
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_error_detail
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_error_detail
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_destroy
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_destroy
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_control_
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_enc_init_ver
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_enc_config_default
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_encode
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_get_cx_data
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_vp8_cx
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_dec_init_ver
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_decode
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_get_frame
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_vp8_dx_algo
  
  1>libavutil.a(opt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavutil.a(parseutils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavcodec.a(h264_sei.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavcodec.a(ratecontrol.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavcodec.a(qsv.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavformat.a(id3v2.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___acrt_iob_func
  
  1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___stdio_common_vfprintf

  What could be missing here ?