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• compiling ffmpeg Ubuntu 16

  23 juin 2020, par retepik

  I am new on stackowerflow.

  



  I need a advice :)
I have tried compile ffmpeg 2.8.15 from source under Ubuntu 16 LTS. I need compile it for one SDK, I can't use ffmpeg from repository. I compiled ffmpeg successfully. But I have got issues with my specify SDK, when I try compile my code with SDK :

  



  SDK.so: undefined reference to `av_rescale_q@LIBAVUTIL_FFMPEG_54'


  



  I suppose that issues are in symbols name. I tried read symbols with

  



  readelf -s libavutil-ffmpeg.so.54


  



  I get in my compiled ffmpeg something like this

  



     158: 0000000000024170    55 FUNC    GLOBAL DEFAULT   12 av_rescale_q@@LIBAVUTIL_54


  



  I tried this with libavutil-ffmpeg.so.54 from repository and i get

  



     158: 0000000000024170    55 FUNC    GLOBAL DEFAULT   12 av_rescale_q@@LIBAVUTIL_FFMPEG_54


  



  I suppose that I need add a suffix "FFMPEG" to symbols name.
I use this configuration for build ffmpeg, it same as configuration of build from repository :

  



  sudo ./configure --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv


  



  Could you help how add suffix "-ffmpeg" to symbols name ?
Thanks

  



  Best Regard

  



  retepik

  


• ffmpeg fails to connect a second camera when run using python thread

  1er juin 2023, par LemonJumps

  I'm starting ffmpeg dshow -> rawvideo over pipe in python thread, see code below

  


      def run(self):
        proc = subprocess.Popen(
            [FFMPEG_DIR + "ffmpeg", "-hide_banner", "-f", "dshow", 
                "-video_size", str(self.resolution[0]) + "x" + str(self.resolution[1]), # select resolution
                "-framerate", str(self.framerate), # select framerate
                "-i", "video=" + self.device, # select device
                "-f", "rawvideo", "-pix_fmt", "bgr24", "pipe:"], # output to pipe
            stdout = subprocess.PIPE)
        
        buf = b''
        
        while True:
            outs = proc.stdout.read(self.resolution[0] * self.resolution[1] *3)
            buf += outs
            
            if len(buf) >= (self.resolution[0] * self.resolution[1] *3):
                with self.lock:
                    self.frame = buf[0:self.resolution[0] * self.resolution[1] *3] 
                    self.cnt += 1
                    
                buf = b''
                
            if self.endEvent.isSet():
                proc.kill()
                return


  


  I am using alternative name as camera name, both cameras are the same model.
both devices name and alternative name :

  


  ('ACR010 USB Webcam', '@device_pnp_\\\\?\\usb#vid_0c45&pid_636a&mi_00#8&83c432e&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global')

  


  ('ACR010 USB Webcam', '@device_pnp_\\\\?\\usb#vid_0c45&pid_636a&mi_00#8&34de11d9&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global')

  


  when I run this code for each camera individually it works flawlessly.
But when I run this for both cameras at the same time, the code results this error :


  


  The "Could not run graph" sounds like ffmpeg can't open multiple devices, or isn't allowed by windows, or maybe there's a token that gets reused because it's all within a single process ?

  


  What could be really causing this error and how can I mitigate it ?

  


• ffmpeg kit android Cannot add audio to some videos

  10 juin 2023, par Rohaitas Tanoli

  I am using the following ffmpeg kit libray in Android To add music to video file.

  


      implementation 'com.arthenica:ffmpeg-kit-full-gpl:5.1'


  


  And I am using the following command to add audio.mp3 file to the video.mp4 file.

  


          StringBuilder command = new StringBuilder()
            .append("-y") // overWrite
            .append(" -i ").append(video) // video
            .append(" -i ").append(audio) // audio
            .append(" -c:v ").append("copy")
            .append(" -c:a ").append("copy")
            .append(" -shortest ")  
            .append(" -f ").append("mp4 ")
            .append(tempFile.getAbsolutePath());


  


  The command is working great. But in some Videos, the audio is not added. That's the problem.

  


  Here are the logs.

  


  Output #0, mp4, to '......./files/temp20230610_223225.mp4':
  Metadata:
    major_brand     : 
isom

    minor_version   : 
512

    compatible_brands: 
isomiso2avc1mp41

    comment         : 
vid:v10044g50000ci19mj3c77u6if7ahsug

    encoder         : 
Lavf59.27.100

  Stream #0:0
(und)
: Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 576x1024 [SAR 1:1 DAR 9:16], q=2-31, 1289 kb/s
, 
30 fps, 
30 tbr, 
15360 tbn
 (default)

    Metadata:
      handler_name    : 
VideoHandler

      vendor_id       : 
[0][0][0][0]

  Stream #0:1
(und)
: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
 (default)

    Metadata:
      handler_name    : 
SoundHandler

      vendor_id       : 
[0][0][0][0]

Stream mapping:
  Stream #0:0 -> #0:0
 (copy)

  Stream #0:1 -> #0:1
 (copy)

Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame= 1257 fps=0.0 q=-1.0 Lsize=    7296kB time=00:00:41.95 bitrate=1424.4kbits/s speed= 425x    
video:6594kB audio:656kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.629013%
frame= 1257 fps=0.0 q=-1.0 Lsize=N/A time=00:00:41.95 bitrate=N/A speed= 423x    
video:6594kB audio:656kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown