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• Ffmpeg how to encode mpg into 2 channel aac ?

  1er août 2012, par Richard Knop

  This command will of course work :

  avconv -i input.mpg -c:v libx264 -s 852x480 -c:a libfaac output.mp4

  But that encodes the mpg into a file with these audio settings :

      {
  
          "index": 1,
  
          "codec_name": "mp2",
  
          "codec_long_name": "MP2 (MPEG audio layer 2)",
  
          "codec_type": "audio",
  
          "codec_time_base": "1/48000",
  
          "codec_tag_string": "mp4a",
  
          "codec_tag": "0x6134706d",
  
          "sample_fmt": "s16",
  
          "sample_rate": "48000",
  
          "channels": 2,
  
          "bits_per_sample": 0,
  
          "r_frame_rate": "0/0",
  
          "avg_frame_rate": "0/0",
  
          "time_base": "1/48000",
  
          "start_time": "0.000000",
  
          "duration": "60.000000",
  
          "nb_frames": "2500",
  
          "tags": {
  
              "language": "und",
  
              "handler_name": ""
  
          }
  
      }

  This is what I need :

  Resolution: 480p
  
  Ratio: 1.78
  
  Audio: 2 channel AAC
  
  Video Bitrates: 600 / 800 / 1200 / 2000
  
  Audio Bitrates: 96
  
  Codec: H.264 - High

  I tried :

  avconv -i input.mpg -c:v libx264 -s 852x480 -c:a libfaac output.mp4

  But I get error :

  Unknown encoder 'libfaac'

  Even after I installed libfaac-dev like this :

  sudo apt-get install libfaac-dev

• How to remove some audio tracks from video file using ffmpeg, and convert remaining mono audio tracks to stereo ?

  3 août 2023, par Strasse

  I have a QuickTime file with 1 video track and 16 audio tracks (all mono, uncompressed 24 bit 48 kHz). Audio tracks 3-16 are blank/silent so I want to remove them completely. In addition, I’d like the remaining mono audio tracks 1 and 2, to (losslessly) become one stereo audio track (mono track 1 becomes left, mono track 2 becomes right). And so the new QuickTime file would include the original unaltered video track, and the one stereo audio track.

  


  Can anyone please suggest the proper ffmpeg language ?

  


  I have seen suggestions to remove unwanted audio tracks using the -map command, but my confusion is how to integrate that with the mono to stereo process, and keep unaltered video.

  


• /bin/sh : ffmpeg : command not found while merge audio with with using ffmpeg aws lamda [duplicate]

  1er mai 2023, par bhavesh kaila

  I am trying to merge audio with video using the below command in AWS lambda using Python but the getting and below error.

  


  ffmpeg Command

  


  cmd = 'ffmpeg  -stream_loop -1 -i mayur.mp4 -i audio.mp3 -shortest -map 0:v:0 -map 1:a:0 -y out/output.mp4'
subprocess.call(cmd, shell=True) 


  


  Aws Lambda Error

  


  2023-05-01T16:08:18.591+05:30   INIT_START Runtime Version: python:3.10.v2 Runtime Version ARN: arn:aws:lambda:eu-north-1::runtime:7764dc7f3ff1fc45718f596be4cd03d7bca223f0586f3bfa5fe6584d6af81cd8

2023-05-01T16:08:19.631+05:30   START RequestId: 4557a174-e12c-4924-971a-ef8f852b106b Version: $LATEST

2023-05-01T16:08:22.286+05:30

Copy
/bin/sh: ffmpeg: command not found
/bin/sh: ffmpeg: command not found

2023-05-01T16:08:23.926+05:30   [ERROR] FileNotFoundError: [Errno 2] No such file or directory: '/tmp/output.mp4' Traceback (most recent call last):   File "/var/task/lambda_function.py", line 65, in lambda_handler     s3_upload_response = s3.put_object(Bucket=bucket, Body=open('/tmp/output.mp4', 'rb'), Key =filename)

2023-05-01T16:08:23.929+05:30   END RequestId: 4557a174-e12c-4924-971a-ef8f852b106b


  


  Full Code snippet

  


  import json
from gtts import gTTS
import openpyxl
import boto3
import base64
import openai
import os
import random
import ffmpeg
import subprocess

# os.system("cp -ra bin/ffmpeg /tmp/")
# os.system("chmod -R 775 /tmp")

#from botocore.vendored import requests
language = 'en'
def lambda_handler(event, context):
    input1 = event["queryStringParameters"]['question']
    outputText=""
    
    # Define variable to load the dataframe
    dataframe = openpyxl.load_workbook('QNA/Book1.xlsx')
    
      #accesskey and secretkey for the S3 bucket
    accesskey = os.getenv("access_key")
    secretkey = os.getenv("secret_key")
    
    # Define variable to read sheet
    ws = dataframe['Sheet1']
    
    for row in ws.iter_rows(0,dataframe.active.max_row):
        for cell in row:
          #print(cell.value)
          if input1 in str(cell.value):
            outputText=row[1].value
  
    
    
      #Save Audio File
    audio = gTTS(text=outputText, lang=language, slow=False)
    audio.save("/tmp/audio.mp3")
    
    cmd='ffmpeg -stream_loop -1 -i QNA/mayur.mp4 -i tmp/audio.mp3 -shortest -map 0:v:0 -map 1:a:0 -y tmp/output.mp4'
    subprocess.run(cmd, shell=True)


  


  Note : I Download the static library from Here and added it to the python folder and generate python.zip with other dependencies and upload it on the aws layer and the AWS layer is linked with the python function.

  


  Note : Above code is working fine with google codelab and is able to generate a merged video working fine.

  


  Any help would be appriciated