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• Cutting and fading ts segment with ffmpeg ?

  6 juillet 2017, par Matt W

  I’m trying to cut a ts segment and apply a fade from white at the initial point of the cut segment. This is used in a situation where I need to "crop" some material from the beginning of a video and apply a fade for a smoother entry. In my test, I am cutting an 8 second segment at the 5.5s mark to yield a 2.5 second segment that will fade from white over the first second.

  The cut command by itself works fine :

  ffmpeg  -i test.ts  -ss 5.5 -c:v libx264 -profile:v baseline -c:a aac -map 0 -mpegts_copyts 1  -preset ultrafast -f ssegment -initial_offset 5.5 -segment_format mpegts   ~/Desktop/cut%d.ts

  I’ve successfully used this fade filter syntax before :

  -filter:v fade=t=in:st=0:d=1:color=0xffffff

  But I can’t seem to make the whole thing work :

  ffmpeg  -i test.ts  -filter:v fade=t=in:st=5.5:d=1:color=0xffffff  -ss 5.5 -c:v libx264 -profile:v baseline -c:a aac -map 0 -mpegts_copyts 1  -preset ultrafast -f ssegment -initial_offset 5.5 -segment_format mpegts   ~/Desktop/cut%d.ts

  I’m getting the following error :

  x264 [error] : baseline profile doesn’t support 4:4:4

  [libx264 @ 0x7fd9db002400] Error setting profile baseline.

  [libx264 @ 0x7fd9db002400] Possible profiles : baseline main high high10
  high422 high444

  Error initializing output stream 0:1 — Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  [aac @ 0x7fd9db001200] Qavg : nan

  Conversion failed !

  My knowledge of ffmpeg just isn’t deep enough to figure out why this is happening. Any thoughts ?

  Thanks,
  Matt

• AttributeError : 'FFmpegAudio' object has no attribute '_process' while trying to play audio from URL

  13 août 2022, par jmcamacho7

  I can't find any solution online and I don't know what's wrong.

  


  My code is : (Not pasting the URL getting since that works fine)

  


  from urllib import parse, request
import re
import pafy
from discord import FFmpegPCMAudio, PCMVolumeTransformer

FFMPEG_OPTIONS = {
    'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'
}

@bot.command(pass_context=True)
async def play(ctx, * , search):
  query_string = parse.urlencode({'search_query': search})
  html_content = request.urlopen('http://www.youtube.com/results?' + query_string)
  search_results=re.findall('watch\?v=(.{11})',html_content.read().decode('utf-8'))
  print(search_results[0])
  
  if(ctx.author.voice):
    channel = ctx.message.author.voice.channel
    await ctx.send("https://www.youtube.com/watch?v="+search_results[0])  
    url = "https://www.youtube.com/watch?v="+search_results[0]
    conn = await channel.connect()
    conn.play(discord.FFmpegAudio(url, **FFMPEG_OPTIONS))
  else:
    await ctx.send("Necesitas estar en un canal de audio para usar este comando")


  


  It just gives me this error everytime I try it :

  


  Traceback (most recent call last):
  File "/home/runner/HakuBot/venv/lib/python3.8/site-packages/discord/player.py", line 103, in __del__
    self.cleanup()
  File "/home/runner/HakuBot/venv/lib/python3.8/site-packages/discord/player.py", line 154, in cleanup
    proc = self._process
AttributeError: 'FFmpegAudio' object has no attribute '_process'


  


  Anyway to solve this ?

  


• Mixing audio, given timestamps. How to do it efficiently ?

  2 août 2021, par Evil

  I have two stereo sounds, 1.wav and 2.wav, these sounds are less than 1 second long and list of timestamps (miliseconds from start of recording). Recording of pure video (recording.mp4) is several hours long and there are thousands (20 000 - 30 000) of timestamps per sounds.

  


  I want to convert list of timestamps and sounds into one recording, merging it with video. The part of merging audio with video is easy with ffmpeg, so this is not part of the question.

  


  The list of timestamps is tsv, for example :

  


  


  1201\t1.wav
  
1501\t2.wav
1603\t1.wav
  
and so on, up to 50 000

  


  


  I can convert it to anything, I am generating this file.

  


  I have seen mixing sound with padding and mixing audio to existing video, but I have to batch process a lots of samples, running sox that many times is not feasible. Mere onstructing input for ffmpeg or sox is a cumbersome task.

  


  I do not use any effects on sounds. There is no explicit support in sox to take one input and play it multiple times (echo / echos destroys the material). Also creating padding or delay takes a lot of time. FFMPEG also needs long query to make it happen.

  


  Since muxing two files is easy, I have tried to record two sounds separately, but still it takes a lot of time to process.

  


  Is there simpler / faster way ?