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• Split HEVC video into pieces of less than 1 second

  28 septembre 2019, par Vadim

  I am trying to split 3-second HEVC video 240fps into 5 parts less than 1 second.

  Video info

  Format                      : HEVC
  
  Format/Info                 : High Efficiency Video Coding
  
  Format profile              : Main@L6@Main
  
  Codec ID                    : hvc1
  
  Codec ID/Info               : High Efficiency Video Coding
  
  Duration                    : 2 s 861 ms
  
  Bit rate                    : 84.8 Mb/s
  
  Width                       : 1 920 pixels
  
  Height                      : 1 080 pixels
  
  Display aspect ratio        : 16:9
  
  Frame rate mode             : Constant
  
  Frame rate                  : 239.760 (240000/1001) FPS
  
  Color space                 : YUV
  
  Chroma subsampling          : 4:2:0
  
  Bit depth                   : 8 bits
  
  Bits/(Pixel*Frame)          : 0.170
  
  Stream size                 : 28.9 MiB (100%)
  
  Title                       : GoPro H.265
  
  Language                    : English
  
  Encoded date                : UTC 2016-05-14 03:54:07
  
  Tagged date                 : UTC 2016-05-14 03:54:07
  
  Color range                 : Full
  
  Color primaries             : BT.709
  
  Transfer characteristics    : BT.709
  
  Matrix coefficients         : BT.709
  
  Codec configuration box     : hvcC

  FFMPEG command :

  ffmpeg -y -i output240.mp4 -c copy -segment_time 0.6 -f segment  output%0d.mp4

  But it cuts into 3 parts 1 second long each

  With h264 there is no such problem.
  If i`ll reincode h265 to h265 with parameter -x264-params keyint=1:scenecut=0

  .//ffmpeg -i testVideo.mp4 -c:v libx264 -x264-params keyint=1:scenecut=0 -c:a copy output.mp4

  It is all ok.

  Is there any option to split without encoding ?

• how to choose ffmpeg video mp3 audio version id ?

  7 juin 2013, par Ulterior

  I am having issues on ffmpeg encoded video files audio tracks. My encoded video contains ID for audio track as extracted from mediainfo :

  I use CODEC_ID_MP3 in guess_format "mov" container for quicktime

  Audio
  
  ID                                       : 2
  
  Format                                   : MPEG Audio
  
  Format version                           : Version 2
  
  Format profile                           : Layer 3
  
  Codec ID                                 : .mp3
  
  Duration                                 : 2s 916ms
  
  Bit rate mode                            : Constant
  
  Bit rate                                 : 128 Kbps
  
  Channel(s)                               : 1 channel
  
  Sampling rate                            : 16.0 KHz
  
  Compression mode                         : Lossy
  
  Stream size                              : 45.3 KiB (2%)
  
  Language                                 : English

  This is not recognized on a vanilla codecless installation of windows 7, only played by k-lite codec libmad

  I have noticed, that another test file contains similar mp3 track and is played by media player OK :

  Audio
  
  ID                                       : 2
  
  Format                                   : MPEG Audio
  
  Format version                           : Version 1
  
  Format profile                           : Layer 3
  
  Mode                                     : Joint stereo
  
  Mode extension                           : MS Stereo
  
  Codec ID                                 : 6B
  
  Duration                                 : 1mn 9s
  
  Bit rate mode                            : Constant
  
  Bit rate                                 : 320 Kbps
  
  Channel(s)                               : 2 channels
  
  Sampling rate                            : 44.1 KHz
  
  Compression mode                         : Lossy
  
  Stream size                              : 2.67 MiB (38%)
  
  Writing library                          : LAME3.98

  The difference I noticed is in Format version number and Codec ID, which is Version 2 from ffmpeg output - I couldnt locate this version setting in ffmpeg source files, so my question is - is there a way to influence this format version identificator and set the codec id as in above playable video ?

• ffmpeg file conversion AWS Lamda

  10 avril 2021, par eartoolbox

  I want a .webm file to be converted to a .wav file after it hits my S3 bucket. I followed this tutorial and tried to adapt it from my use case using the .webm -> .wav ffmpeg command described here.

  


  My AWS Lambda function generally works, in that when my .webm file hits the source bucket, it is converted to .wav and ends up in the destination bucket. However, the resulting file .wav is always 0 bytes (though the .webm not, including the appropriate audio). Did I adapt the code wrong ? I only changed the ffmpeg_cmd line from the first link.

  


  import json
import os
import subprocess
import shlex
import boto3

S3_DESTINATION_BUCKET = "hmtm-out"
SIGNED_URL_TIMEOUT = 60

def lambda_handler(event, context):

    s3_source_bucket = event['Records'][0]['s3']['bucket']['name']
    s3_source_key = event['Records'][0]['s3']['object']['key']

    s3_source_basename = os.path.splitext(os.path.basename(s3_source_key))[0]
    s3_destination_filename = s3_source_basename + ".wav"

    s3_client = boto3.client('s3')
    s3_source_signed_url = s3_client.generate_presigned_url('get_object',
        Params={'Bucket': s3_source_bucket, 'Key': s3_source_key},
        ExpiresIn=SIGNED_URL_TIMEOUT)
    
    ffmpeg_cmd = "/opt/bin/ffmpeg -i \"" + s3_source_signed_url + "\" -c:a pcm_f32le " + s3_destination_filename + " -"
    
    
    command1 = shlex.split(ffmpeg_cmd)
    p1 = subprocess.run(command1, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    resp = s3_client.put_object(Body=p1.stdout, Bucket=S3_DESTINATION_BUCKET, Key=s3_destination_filename)

    return {
        'statusCode': 200,
        'body': json.dumps('Processing complete successfully')
    }