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• Missing library files in PyInstaller with FFMPEG

  9 mars 2020, par djcmm476

  I’m quite new to PyInstaller, but I’m trying to get it to build an exe from a little set of scripts I’ve written. Unfortunately, I use a couple of different modules, like FFMPEG (through FFPyPlayer). When I try to build I get :

  360570 WARNING : lib not found : avformat-58.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360572 WARNING : lib not found : SDL2_mixer.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360573 WARNING : lib not found : swresample-3.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360578 WARNING : lib not found : avdevice-58.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360580 WARNING : lib not found : swscale-5.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360582 WARNING : lib not found : avfilter-7.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360583 WARNING : lib not found : postproc-55.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360584 WARNING : lib not found : avutil-56.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  360586 WARNING : lib not found : avcodec-58.dll dependency of c :\users\me\appdata\local\programs\python\python37\lib\site-packages\ffpyplayer\player\player.cp37-win_amd64.pyd

  I couldn’t find these dlls, but I found them on the ffmpeg site and tried to point PyInstaller right at them using —paths, but it doesn’t make a difference.

  Does anyone have any suggestions ? They’d be greatly appreciated.

• Using FFMPEG To Fill in Gaps of a Raw Audio UDP Stream

  14 février 2020, par Wallace

  I have a software defined radio (SDR) that picks up audio from emergency services and with the help of software, streams raw audio using UDP. The audio is PCM signed 16-bit little-endian. The UDP stream is also not constant and only has data when audio is detected.

  The problem I’m trying to solve is that I would like the gaps in recorded audio to be filled with silent or Null audio. Below are just a couple of my attempts at resolving this :

  1. ffmpeg -f s16le -ar 8000 -i udp ://127.0.0.1:23456 -af aresample=async=1 -acodec libmp3lame -
     f rtp rtp ://127.0.0.1:1234
  2. ffmpeg -re -f lavfi -i anullsrc -f s16le -ar 8000 -i udp ://127.0.0.1:23456 -filter_complex
     amix=inputs=2:duration=first -acodec libmp3lame -f rtp rtp ://127.0.0.1:1234

  I guess my questions are regarding the best way to resolve this and whether or not ffmpeg can be used in a way to accomplish this ?

• How do you generate a looping animated gif for Facebook with ffmpeg

  7 février 2020, par Alan W. Smith

  When I paste a giphy url (like this one) into a facebook post or comment, the gif plays immediately and loops indefinitely. When I upload ones I make from ffmpeg, neither of those things happen. You have to click a play button to start the animation and then it ends after one time through.

  I have a couple of ffmpeg commands I use to create the gifs. They are :

  ffmpeg -ss 10 -t 5  -i input.m4v -vf "fps=15,scale=800:-2:flags=lanczos,palettegen" -y palette.png

  and

  ffmpeg -ss 10.6 -t 5 -i input.m4v -i palette.png -filter_complex "fps=15,scale=800:-1:lanczos[video];[video][1:v]paletteuse" output.gif

  The first one generates a custom color pallet that’s used by the second one to create a high quality animated gif. I’ve also tried adding -loop 0 (i.e. ffmpeg -ss 10.6 -t 5 -i input.m4v -i palette.png -filter_complex "fps=15,scale=800:-1:lanczos[video];[video][1:v]paletteuse" -loop 0 output.gif) but that didn’t work either.

  I also tried uploading the ffmpeg generated images to a personal website and calling them from there but those didn’t load at all.

  In case it helps, here’s a copy of one of the gifs (which autostarts and loops on StackOverflow for me but not on FB)

  

  How does one go about creating a gif that will autostart and loop indefinitely for facebook ?

  (Note : I’ve got no problem if I need to do something with a personal website, but I don’t want to use Giphly or the other animated gif sites directly if at all possible. Also worth pointing out that I discovered if I download the image from giphly and upload it, it doesn’t autostart either. So, this may be something internal to FB, but I’d still like to figure that out.)