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• Can't find ffmpeg with subprocess python in remote server [closed]

  18 août 2021, par Castle Edu

  I am using DigitalOcean Droplet on Ubuntu, I've downloaded ffmpeg to my remote server via ssh + sudo apt-get install ffmpeg

  


  With $ whereis ffmpeg I've found that my ffmpeg is located in /usr/bin/ffmpeg.

  


  All code are in virtualenv and pushed and was working with git.

  


  My web app needs to convert sample rate of received audio/ogg file.

  


  command = [
        'ssh', 'root@ip-to-server',
        r'/usr/bin/ffmpeg',  # path to ffmpeg
        '-i', in_filename,
        '-f', 'ogg',
        '-acodec', 'libopus',
        '-ar', '16000',
        '-'
    ]

    proc = subprocess.Popen(command, stdout=out_file)
    proc.wait()


  


  This code return after audio request this message :

  


  Host key verification failed.


  


  I've tried to subprocess.Popen() without ssh line :

  


  command = [
        r'/usr/bin/ffmpeg',  
        '-i', in_filename,
        '-f', 'ogg',
        '-acodec', 'libopus',
        '-ar', '16000',
        '-'
    ]

    proc = subprocess.Popen(command, stdout=temp_out_file)
    proc.wait()


  


  But it returns : That there is no Such file or directory /usr/bin/ffmpeg

  


  I've tested same on my local computer, with path like /User/Desktop/App-name/ffmpeg. It runs correctly, so what's the problem ?

  


  My questions are :

  


  

  1. Where my code executes ? On my ubuntu remote server or ?

  


  2. How to subprocess correctly ? via ssh or not ?

  


  3. Which path should I point ?

  


  


• How can I encode RGB images into HDR10 videos in ffmpeg command-line ? [closed]

  5 juin 2024, par F.X.

  How can I encode HDR10 videos from RGB images using the ffmpeg command-line, with the proper color and luminance metadata ?

  


  There are a lot of ffmpeg command-line examples floating around when searching information about how to encode HDR10 streams properly, but I didn't find any that has a comprehensive list of all the parameters you can tune when using RGB frames as inputs.

  


  For example :

  


  

  • This article has a lot of information, but uses an existing video as input.

  


  • Similarly, this article uses an existing video as input

  


  


• FFMPEG & HW Acceleration Unable to find a suitable output format for 'cuda' ?

  10 juillet 2022, par user2522885

  I'm curious about FFMPEG and GPU hardware acceleration. My Windows 10 system uses the Asus / nVidia GTX 760 graphics card and Intel i5-2500K CPU. My graphics card claims to be of the Kepler architecture with CUDA 3.0 as shown here.

  


  Instead of going through the hassles of compiling FFMPEG with hw acceleration support i downloaded a pre-compiled binary from here and here.

  


  Next, i tried running a test with hw acceleration options as recommended here :

  


  ffmpeg -y -vsync 0 -i "input.mkv" -hwaccel cuda -hwaccel_output_format cuda -c:a copy -c:v h264_nvenc "output.mp4"


  


  I then received the error message :

  


  


  [NULL @ 000002257f4af540] Unable to find a suitable output format for 'cuda'

  


  cuda : Invalid argument

  


  


  What am i doing wrong ? For the record i install the CUDA setup file but it made no difference. I am using the latest nVidia drivers.

  


  UPDATE

  


  I modified the line to :

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i "input.mkv" -c:a copy -c:v h264_nvenc "output.mp4" 


  


  The new error message is :

  


  


  [h264_nvenc @ 00000191f5c8d400] Lossless encoding not supported

  


  [h264_nvenc @ 00000191f5c8d400] Provided device doesn't support required NVENC features Error initializing output stream 0:0 — Error
while opening encoder for output stream #0:0 - maybe incorrect
parameters such as bit_rate, rate, width or height