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• qsv : Join the derived session to the parent

  24 septembre 2017, par Luca Barbato

  qsv : Join the derived session to the parent
  Should improve the performance on multiple transcoding from a single
  
  source.
  

  • [DBH] libavcodec/qsv.c
  • [DBH] libavfilter/qsvvpp.c

• Writing metadata (Artist Name, Song Title, Year, Album, Duration, Genre) to mp3/m4a audio file using youtube-dl (subsequent AtomicParsely error)

  10 décembre 2016, par IRNotSmart

  I am extracting audio only from youtube videos using youtube-dl. I would like to write the metadata (i.e. Artist Name and Song Title, Year, Album, Duration, Genre) into the mp3/m4a file after downloading. My attempt to accomplish this starts with this code :

  @echo off
  
  youtube-dl --format m4a/mp3 --youtube-skip-dash-manifest --embed-thumbnail -o "%%(title)s.%%(ext)s" --metadata-from-title "%%(artist)s - %%(title)s" --add-metadata 2Y6Nne8RvaA
  
  pause

  This code produces the following output :

  [youtube] 2Y6Nne8RvaA: Downloading webpage
  
  [youtube] 2Y6Nne8RvaA: Extracting video information
  
  [youtube] 2Y6Nne8RvaA: Downloading thumbnail ...
  
  [youtube] 2Y6Nne8RvaA: Writing thumbnail to: Kungs vs Cookin' on 3 Burners - Thi
  
  s Girl.jpg
  
  [download] Destination: Kungs vs Cookin' on 3 Burners - This Girl.m4a
  
  [download] 100% of 2.99MiB in 00:01
  
  [ffmpeg] Correcting container in "Kungs vs Cookin' on 3 Burners - This Girl.m4a"
  
  
  
  [fromtitle] parsed title: This Girl
  
  [fromtitle] parsed artist: Kungs vs Cookin' on 3 Burners
  
  [ffmpeg] Adding metadata to 'Kungs vs Cookin' on 3 Burners - This Girl.m4a'
  
  ERROR: AtomicParsley was not found. Please install.
  
  Press any key to continue . . .

  As you can see, I am able to successfully able to add a few of the tags from the video, but not all of them and the Year is royally screwed up.
  

  What is this AtomicParsely error and how do I remedy it ? Do I need this program to correctly add all the Metadata to the file that I want, or can this be accomplished in another way ?

  Referencing Steven Penny’s post, FFmpeg metadata not showing in Windows ?, is solving this problem as simple as using an ffmpeg command ?

  When I do a google search for this song, the first link that shows is the exact link I’m using on YouTube, and the search shows pertinent metadata (see below). I’m not sure if this data is input manually by users, or if Google mined this from the video :
  

  I admit that I’m new to using youtube-dl and ffmpeg, but with the help of the commenters on StackOverflow, I’m learning more each day. This post is a follow-up to my previous question : Downloading YouTube to mp3 and writing metadata (artist/song title) to mp3 file using youtube-dl

• Subprocess call stopping asynchronously-executed Python parent process

  6 mai 2016, par Suriname0

  The following shell session demonstrates the behavior I am seeing :

  [user@compname python-test]$ cat test.py
  
  #!/usr/bin/env python
  
  import subprocess
  
  from time import sleep
  
  proc = subprocess.Popen("ffmpeg", stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
  
  print "Starting process: " + str(proc)
  
  status = proc.poll()
  
  while status is None:
  
      print "Process still running."
  
      sleep(0.01)
  
      status = proc.poll()
  
  print "Status: " + str(status)
  
  [user@compname python-test]$ python test.py
  
  Starting process: 
  
  Process still running.
  
  Process still running.
  
  Status: 1
  
  [user@compname python-test]$ python test.py &
  
  [4] 6976
  
  [user@compname python-test]$ Starting process: 
  
  Process still running.
  
  Process still running.
  
  [4]+  Stopped                 python test.py
  
  [user@compname python-test]$ ps
  
    PID TTY          TIME CMD
  
   4684 pts/101  00:00:00 python
  
   4685 pts/101  00:00:00 ffmpeg
  
   7183 pts/101  00:00:00 ps
  
  14385 pts/101  00:00:00 bash

  As you can see, when the simple test Python program is run normally, it completes successfully. When it is run asynchronously (using &), the Python process is stopped as soon as the subprocess call is complete (and poll() would return a non-None value).

  1. The same behavior occurs when using Popen.wait()
  2. The behavior is unique to ffmpeg.
  3. Both the Python process and ffmpeg are ending up stopped, as seen in the call to ps.

  Can someone help me detangle this behavior ? I don’t see anything in the documentation for the subprocess module, bash’s & operator, or ffmpeg that would explain this.

  The Python version is 2.6.6, bash is GNU bash version 4.1.2(1)-release (x86_64-redhat-linux-gnu), ffmpeg is version 3.0.1-static.

  Thank you for any help !