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• how encode xdcam.mxf and set for mediainfo flag "standard : component"

  3 août 2018, par livio

  My goal is to encode an XdcamHD 50Mb .mxf, with ffmpeg or ffmbc or bmx, and get the following Mediainfo technical and tag data

  Format Settings, Matrix : Custom

  Standard : Component

  enter image description here

  When I try to convert with FFmbc I get a correct XdcamHD in every aspects, except the following Mediainfo technical data :

  Format Settings, Matrix : Default

  Standard : PAL

  enter image description here

  The target file and my file analized whith ffprobe are identical

  on the left target file on the right my encoded file

  enter image description here

  and this is my code

  ffmbc.exe -i %1 -tff -target xdcamhd422 -t 5 -y rewrapffmbc.mxf 

  When i try to convert with ffmpeg I obtain the same good file but if I read the technical and tag data in Mediainfo the flag "Standard :" has disappeared. Also in this case my file is being rejected from a Broadcast Company we deal with.

  here is the ffmpeg code

  ffmpeg.exe  -i %1 -r 25 -aspect 16:9 -pix_fmt yuv422p -color_primaries 1 -color_trc 1 -colorspace 1 -vcodec mpeg2video -non_linear_quant 1 -flags +ildct+ilme -top 1 -intra_vlc 1 -qmax 3 -lmin "1*QP2LAMBDA" -vtag xd5c -rc_max_vbv_use 1 -rc_min_vbv_use 1 -g 12 -b:v 50000k -minrate 50000k -maxrate 50000k -bufsize 3835k -bf 2 -trellis 1 -map 0:0 -map 0:1 -map 0:2 -map 0:1 -map 0:2 -map 0:1 -map 0:2 -map 0:1 -map 0:2  -map_channel 0.1.0:0.1.0 -map_channel 0.2.0:0.2.0  -map_channel 0.1.0:0.3.0 -map_channel 0.2.0:0.4.0  -map_channel 0.1.0:0.5.0 -map_channel 0.2.0:0.6.0  -map_channel 0.1.0:0.7.0 -map_channel 0.2.0:0.8.0 -c:a pcm_s24le -ar 48000 -ac 1 -map_metadata 0  -timecode 09:59:59:20 -y profilo-1.mxf

  Can someone provide a solution or a workaround ?

  Thank you

• Pyinstaller exe works halfway on another computer

  5 novembre 2022, par At Bay

  I wrote a code which uses FFMPEG and os, subprocess, datetime, speechrecognition, and xlsxwriter libraries. Below a brief sketch of the code - it goes through a directory of wav files and creates a transcription for X seconds in length and saves it into an excel sheet.
import os
import subprocess
import datetime
import speech_recognition as sr
import xlsxwriter

  


  def ffmpeg():
   #create clip
   subprocess.run(["ffmpeg", "-ss", starti, "-t", lengthi, "-i", filepathO, filepathNEW1])

   #convert to mono
   subprocess.run(["ffmpeg", "-i", filepathNEW1, "-ac", "1", filepathNEW2])
   
   #compres to 44.1 kHZ
   subprocess.run(["ffmpeg", "-i", filepathNEW2, "-ar", "44100", filepathNEW3])

def transcription():
    with sr.AudioFile(os.path.abspath(clippath)) as source:
       audio = r.record(source)  # read the entire audio file
       transcriptstring = str(r.recognize_google(audio, language = 'en', show_all=True))
       worksheet.write(tcol, transcriptstring)


#call functions in this order
for filename in os.listdir(ufolder):
   if (filename.endswith(".wav")):
       ffmpeg() #cuts clips, compresses to mono and 44.1 khz
       transcription() 

workbook.close()



  


  When I try to run the exe created by pyinstaller, I get the following error :

  


  Enter directory of wav files: C:\Users\myname\Downloads\&#xA;Enter clip start (seconds): 0&#xA;Enter desired clip length (seconds): 5&#xA;Traceback (most recent call last):&#xA;  File "cliptranscript.py", line 134, in <module>&#xA;  File "cliptranscript.py", line 47, in ffmpeg&#xA;  File "subprocess.py", line 503, in run&#xA;  File "subprocess.py", line 971, in __init__&#xA;  File "subprocess.py", line 1440, in _execute_child&#xA;FileNotFoundError: [WinError 2] The system cannot find the file specified&#xA;[13304] Failed to execute script &#x27;cliptranscript&#x27; due to unhandled exception!&#xA;</module>

  


  Below is a partial view of the folder created by pyinstaller :


  


• audio is not exact copy in ffmpeg proxies

  9 mars 2023, par 5Diraptor

  I always work with proxy footage in Premiere Pro, so I have a batch file set up to run any new raw footage through ffmpeg and produce a proxy version. I avoid creating proxies through Premiere Pro as it's slow, I have little control over the output, and often the proxies aren't compressed as much as they could be.

  


  This is the command I run to create proxies. It also overlays a watermark so that it is obvious when proxies are used.

  


  ffmpeg -i "original.MOV" -i "proxy_overlay.png" -filter_complex "overlay=0:0" -crf 20 -c:v libx264 -c:a copy "Proxy/proxy_for_original.mov"


  


  This has always been fine, but I've received some footage to work on from a different camera, and when I create proxies and try to attach them in Premiere Pro, I get the error : "Proxy Media and Full Resolution Media must have matching audio channels."

  


  

  


  When I compare the file properties in Premiere Pro, I see this :

  


  Original :

  


  

  


  Proxy :

  


  

  


  As you can see, the original contains 8x audio tracks and a timecode track, but the proxy version doesn't state this.

  


  I've been working on the ffmpeg command to try and retain the original audio details, but nothing I do seems to work. I thought that the command -c:a copy would copy the audio tracks across without any changes at all. However I can't seem to find a command that creates an exact copy of all audio tracks. Also does the timecode track matter, should I map this to the proxy as well ?