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• Why is my FastAPI process being suspended, and how can I avoid this ?

  19 janvier, par blermen

  I'm working on a web app using FastAPI that uses ffmpeg to overlay audio onto video for the user. I'm running into an issue where, when I use subprocess.run(cmd), it automatically suspends the process running my FastAPI app. I can't figure out how to get the error logs to help deduce why this is, and I haven't found anything online talking about this.

  


  @app.get("/overlay-audio/")
async def get_video(audio_file: str, forged_name: Annotated[str, Query()] = "default"):
    video_path = os.path.join(output_path, "sample.mp4")
    audio_path = os.path.join(output_path, audio_file)
    forged_path = os.path.join(output_path, forged_name + ".mp4")
    print("Video path: " + video_path)
    print("Audio path: " + audio_path)
    print("Output path: " + forged_path)

    # command to recreate
    # ffmpeg -i input.mp4 -i input.wav -c:v copy -map 0:v:0 -map 1:a:0 -c:a aac -b:a 192k output.mp4

    cmd = ["/opt/homebrew/bin/ffmpeg", 
           "-i", video_path,
           "-i", audio_path,
           "-c:v", "copy",
           "-map", "0:v:0",
           "-map", "1:a:0",
           "-c:a", "aac",
           "-b:a", "192k",
           forged_path]
    
    subprocess.run(cmd)
           
    return {"forged_vid": f"forged_{forged_name}"}


if __name__ == "__main__":
    uvicorn.run("main:app", host="127.0.0.1", port=8000, reload=True)


  


  I've tried not writing output to the terminal, as I've read that could be a reason why it suspends using result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE), and I've also tried running it asynchronously to avoid blocking the event loop using

  


  result = await asyncio.create_subprocess_exec(
        *cmd,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE
    )


  


  but nothing works. Any help or possible other ways to go about this would be greatly appreciated. Terminal output about the suspension : [1] + 12526 suspended (tty output) "/Users//Tech Projects/project/tts/videnv/bin/python"

  


• ffmpeg append video with different dimensions

  21 avril 2020, par friendlygiraffe

  I am cropping and adding subtitles to a video using the following :

  



  ffmpeg -i inputfile.mov -lavfi "crop=720:720:280:360,subtitles=subs.srt:force_style='OutlineColour=&H100000000,BorderStyle=3,Outline=1,Shadow=0,MarginV=20,Fontsize=18'" -crf 1 -c:a copy output.mov

  



  I have another video called credits.mp4 which has the same dimensions as the output.mov (after cropping). Can I do this during the above process, or would I have to use something like concat afterwards ?

  



  Using bash in Terminal on a Mac

  


• I cannot convert a set of images taken from a FTP to a video using FFMPEG

  7 septembre 2022, par Victoriano Fernández Tomás

  I am writting a python code where I am trying to convert a set of images that I take from a FTP into a video using FFMPEG but I cannot. I have tried, instead of reading the folder where the images are, to read a txt file with the name of the images that I want to use, with the format needed in order that FFMPEG could read it propertly, but I get always the same error : Protocol 'ftp' not on whitelist 'tcp'
In the same code, I also try to change the format of one video and change the resolution and size, and this part of code works well.
However, writting as input the same reference of the FTP, the images' code fail and the video's code works.
Besides, I have tried in my terminal as local the same command I write in the code for the images, and in local it works propertly, but not in the code.
Here there is a part of my code :

  


  Video's code (it works) :

  


  command = """ffmpeg -i {i} -an -crf {r} {o}""".format(i=src_path,o=path,r=resolution)


  


  An example of this command when I run this is the next (I dont want to write the exact ip and port) :

  


  ffmpeg -i ftp://user:user@ip:port/landing_ffmpeg/pruebas/pruebahd.mp4 -an -crf 45 tmp/pruebasalida456.mp4


  


  And next the images' code (it doesnt work) :

  


  command = """ffmpeg -loop 1 -framerate {ips} -i {i} -t 10 -pix_fmt yuv420p {o}""".format(i=src_path,o=path,ips=img_per_sec)


  


  An example of this command is the next :

  


  ffmpeg -loop 1 -framerate 2 -i ftp://user:user@ip:port/landing_ffmpeg/pruebas/prueba_imagenes/prueba06.jpg -t 10 -pix_fmt yuv420p tmp/videoimagen.mp4


  


  And the error I get with this code is the next :

  


  [ftp @ 0x560eb3e11800] Protocol 'ftp' not on whitelist 'tcp'!
[image2 @ 0x560eb3e09380] Could not open file : ftp://user:user@ip:port/landing_ffmpeg/pruebas/prueba_imagenes/prueba06.jpg


  


  I dont get this error when I try to run the command of the video, only for the images. And both commands run propertly when I write in my terminal in local, with local paths.

  


  I would appreciate if someone can help me to solve the problem and fix my code.

  


  Thanks !