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• Using ffmpeg to obtain video durations in python

  24 novembre 2024, par OSK

  I've installed ffprobe using the pip ffprobe command on my PC, and installed ffmpeg from here.

  


  However, I'm still having trouble running the code listed here.

  


  I try to use the following code unsuccessfully.

  


  SyntaxError: Non-ASCII character '\xe2' in file GetVideoDurations.py
on line 12, but no encoding declared; see
http://python.org/dev/peps/pep-0263/ for details


  


  Does anyone know what's wrong ? Am I not referencing the directories correctly ? Do I need to make sure the .py and video files are in a specific location ?

  


  import subprocess

def getLength(filename):
    result = subprocess.Popen(["ffprobe", "filename"],
    stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
    return [x for x in result.stdout.readlines() if "Duration" in x]

fileToWorkWith = ‪'C:\Users\PC\Desktop\Video.mkv'

getLength(fileToWorkWith)


  


  Apologies if the question is somewhat basic. All I need is to be able to iterate over a group of video files and get their start time and end time.

  


  Thank you !

  


• Determine FFmpeg codecs available for container

  19 juillet 2020, par CasualDemon

  I am looking to generate lists of supported video / audio / subtitle tracks for each type of container in a particular build of FFmpeg.

  


  For example, I want to avoid errors like Could not find tag for codec <> in stream #0, codec not currently supported in container

  


  I know I can list available codecs with ffmpeg -codecs, and find details about a muxer with ffmpeg -h muxer=<muxer></muxer> like ffmpeg -h muxer=matroska but that will only show default codecs, not all possible.

  


  Muxer matroska [Matroska]:
    Common extensions: mkv.
    Mime type: video/x-matroska.
    Default video codec: h264.
    Default audio codec: vorbis.
    Default subtitle codec: ass.


  


  Basically I want to run this command across all available muxers to build up a table like wikipedia's format comparison charts that is FFmpeg build specific. This is designed to go in a program that wraps around FFmpeg, and I need to know which formats are valid for each container / file extension per FFmpeg build.

  


  Thanks !

  


• Error trying to decode 4K video using NVDEC

  19 avril 2024, par Nestoraj

  I am trying to convert a 4K HEVC MKV file of 70GB into another HECV file but with less size. I am using FFmpeg with Nvidia acceleration but when I execute the following command an error appears :

  



  ffmpeg -y -vsync 0 -hwaccel_device 0 -hwaccel cuvid -c:v hevc_cuvid -i input.mkv -c:a copy -c:v hevc_nvenc -preset slow -b:v 10M -bufsize 10M -maxrate 15M -qmin 0 -g 250 -bf 2 -temporal-aq 1 -rc-lookahead 20 -i_qfactor 0.75 -b_qfactor 1.1 output.mkv


  



  The error is :

  



  [hevc_nvenc @ 0000021036b0d000] 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


  



  The video file has these details :

  



  

  



  It seems that FFmpeg cannot recognize my GPU as a supported device to decode but I have read that Nvidia has support for my card with NVDEC.

  



  I am running Windows 10 64 bits with i7 4790 and GTX 1080