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• How to combine a .MP4 video with a .WAV audio to create a new .MP4 video using ffmpeg from command line arguments ?

  18 mai 2017, par Ashish

  I want to merge a .WAV audio file with a .MP4 video file to create a new .MP4 video file.

  And i am currently using the following codes to do that :

  ffmpeg -i input_vid.mp4 -i input_audio.wav -vcodec copy -acodec copy output.mp4

  But it is only creating output.mp4 file but no videos embedded with that means if i am playing that output.mp4 file then nothing is playing.
  And i don’t know where i am doing wrong so that it is creating like this.

  I know this type of questions already asked by may persons but that didn’t help me much so if anybody can find where i am doing wrong or how to solve this problem please help me to solve my problem.

• Unable to find suitable output format for 'libmp3lame' and 'flv'

  24 février 2017, par user2108727

  Currently I am trying to setup a livestream using ffmpeg in Kubuntu. I got really far, but unfortunately I cannot figure out one bit that mentions output format errors. Here’s the code I am using for my .sh file :

  #! /bin/bash
  
  
  
  # streaming on Ubuntu via ffmpeg.
  
  # see http://ubuntuguide.org/wiki/Screencasts for full documentation
  
  
  
  # input resolution, currently fullscreen.
  
  # you can set it manually in the format "WIDTHxHEIGHT" instead.
  
  INRES="1920x1200"
  
  
  
  # output resolution.
  
  # keep the aspect ratio the same or your stream will not fill the display.
  
  OUTRES="1280x720"
  
  
  
  # input audio. You can use "/dev/dsp" for your primary audio input.
  
  #INAUD="pulse"
  
  
  
  # target fps
  
  FPS="30"
  
  
  
  # video preset quality level.
  
  # more FFMPEG presets avaiable in /usr/share/ffmpeg
  
  QUAL="ultrafast"
  
  
  
  # stream key. You can set this manually, or reference it from a hidden file     
  
  like what is done here.
  
  STREAM_KEY=$(cat ~/.twitch_key)
  
  
  
  # stream url. Note the formats for twitch.tv and justin.tv
  
  # twitch:"rtmp://live.twitch.tv/app/$STREAM_KEY"
  
  # justin:"rtmp://live.justin.tv/app/$STREAM_KEY"
  
  STREAM_URL="rtmp://live-cdg.twitch.tv/app/$STREAM_KEY"
  
  
  
  ffmpeg \
  
  -f alsa -ac 2 -i "$INAUD" \
  
  -f x11grab -s "$INRES" -r "$FPS" -i :50.0 \
  
  -vcodec libx264 -s "$OUTRES" -preset "$QUAL" -crf 22\
  
  -acodec libmp3lame -threads 6 -q:a 0 -b:a 160k \
  
  -f flv -ar 44100 "$STREAM_URL"

  Now the issue is that whenever I run the .sh file, I get an error at the end saying

  Unable to find a suitable output format for 'libmp3lame'
  
  libmp3lame: Invalid argument

  So I decided to troubleshoot by removing the audio line at the bottom and it just turned into

  Unable to find a suitable output format for 'flv'
  
  flv: Invalid argument

  Something tells me this is because the stream key is not defined properly, but I have no idea whatsoever how to fix this.

  So does anyone have an idea ?
  Thanks in advance !

  Misterff1

• How can I get Python to find ffprobe ?

  23 décembre 2016, par Gloin

  I have ffmpeg and ffprobe installed on my mac (macOS Sierra), and I have added their path to PATH. I can run them from terminal.

  I am trying to use ffprobe to get the width and height of a video file using the following code :

  import subprocess
  
  import shlex
  
  import json
  
  
  
  
  
  # function to find the resolution of the input video file
  
  def findVideoResolution(pathToInputVideo):
  
      cmd = "ffprobe -v quiet -print_format json -show_streams"
  
      args = shlex.split(cmd)
  
      args.append(pathToInputVideo)
  
      # run the ffprobe process, decode stdout into utf-8 & convert to JSON
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
      ffprobeOutput = json.loads(ffprobeOutput)
  
  
  
      # find height and width
  
      height = ffprobeOutput['streams'][0]['height']
  
      width = ffprobeOutput['streams'][0]['width']
  
  
  
      return height, width
  
  
  
  h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
  print(h, w)

  I am sorry I cannot provide a MCVE, as I didn’t write this code, and I don’t really know how it works.

  It gives the following error :

  Traceback (most recent call last):
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 21, in <module>
  
      h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 12, in findVideoResolution
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 626, in check_output
  
      **kwargs).stdout
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 693, in run
  
      with Popen(*popenargs, **kwargs) as process:
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 947, in __init__
  
      restore_signals, start_new_session)
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 1551, in _execute_child
  
      raise child_exception_type(errno_num, err_msg)
  
  FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe'
  
  </module>

  If python is not reading from the PATH file, how can I specify where ffprobe is ?

  EDIT :
  It appears the python path is not aligned with my shell path.
  Using os.environ["PATH"]+=":/the_path/of/ffprobe/dir" at the beginning of each program allows me to use ffprobe, but why might my python path not be the same as my shell path ?