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• How to get a 7.1 PCMle encode in an MOV container to stay a single track while also rendering as 8 mono tracks in an NLE like an MXF container

  26 février 2024, par varys_da_spidah

  I've been trying to convert Blu-Ray footage to the most efficient, yet least time consuming format for editing footage from them. For a while, I would make an MXF container and encode the h264 to DNxHD and the lossless compressed audio to pcm_s24le. I really liked how convenient it was to have my audio linked to my video, how it could be played as a single track in a media player, but then be inserted into my NLE as 6-8 separate mono tracks.

  


  However, I found the DNxHD encodes to be unnecessary as they took up too much storage space and my NLE could perfectly handle the original h264 files in an MOV or MP4 container. But I noticed that switching from MXF to an MOV container meant that things that were jettisoned from the former were in the latter. Some of this was actually welcome, like the chapter markers, but I noticed that 7.1 audio (but not 5.1 for some reason) would now render in my NLE as a single 7.1 track.

  


  I looked in MediaInfo and think I figured out that the issue is that the MOV container formats the channel layout while the MXF one doesn't. I'll paste the info to show what I mean

  


  MOV FILE

  


  


  

  • ID : 2

  


  • Format : PCM

  


  • Format settings : Little / Signed

  


  • Codec ID : in24

  


  • Duration : 1 min 41 s

  


  • Bit rate mode : Constant

  


  • Bit rate : 9 216 kb/s

  


  • Channel(s) : 8 channels

  


  • Channel layout : L R C LFE Ls Rs Lb Rb

  


  • Sampling rate : 48.0 kHz

  


  • Bit depth : 24 bits

  


  • Stream size : 111 MiB (34%)

  


  • Title : English

  


  • Language : English

  


  • Default : Yes

  


  • Alternate group : 1

  


  • Menus : 3

  


  


  


  MXF FILE

  


  


  

  • ID : 3

  


  • Format : PCM

  


  • Format settings : Little

  


  • Format settings, wrapping mode : Frame (AES)

  


  • Codec ID : 0D01030102060300

  


  • Duration : 1 min 13 s

  


  • Bit rate mode : Constant

  


  • Bit rate : 9 216 kb/s

  


  • Channel(s) : 8 channels

  


  • Sampling rate : 48.0 kHz

  


  • Frame rate : 23.976 FPS (2002 SPF)

  


  • Bit depth : 24 bits

  


  • Stream size : 81.1 MiB (5%)

  


  • Delay_SDTI : 0

  


  • Locked : Yes

  


  


  


  Any ideas ?

  


  I tried this code :

  


  ffmpeg -i "INPUT.mkv" -c:v copy -r 23.976 -c:a pcm_s24le -filter_complex "[0:a:0]pan=mono|c0=c0[a0]; [0:a:1]pan=mono|c0=c0[a1]; [0:a:2]pan=mono|c0=c0[a2]; [0:a:3]pan=mono|c0=c0[a3]; [0:a:4]pan=mono|c0=c0[a4]; [0:a:5]pan=mono|c0=c0[a5]; [0:a:6]pan=mono|c0=c0[a6]; [0:a:7]pan=mono|c0=c0[a7]; [a0][a1][a2][a3][a4][a5][a6][a7]amerge=inputs=8" "OUTPUT.mov”

  


  And got this error message :

  


  Stream specifier ':a:4' in filtergraph description [0:a:0]pan=mono|c0=c0[a0]; [0:a:1]pan=mono|c0=c0[a1]; [0:a:2]pan=mono|c0=c0[a2]; [0:a:3]pan=mono|c0=c0[a3]; [0:a:4]pan=mono|c0=c0[a4]; [0:a:5]pan=mono|c0=c0[a5]; [0:a:6]pan=mono|c0=c0[a6]; [0:a:7]pan=mono|c0=c0[a7]; [a0][a1][a2][a3][a4][a5][a6][a7]amerge=inputs=8 matches no streams.

  


• How can I add chapters to a mp4 file using bash script and ffmpeg

  17 septembre 2023, par Rick T

  I'm trying to add chapters to an mp4 file using bash and ffmpeg. The chapters are located in a file called chapters.txt. When the bash script is run which is called add_chapters.sh it reads the chapters.txt file and creates a file called chapters.ffmetadata. The issue is that the START and END times in the file chapters.ffmetadata aren't being created correctly. How can I fix this ?

  


  


  1. I have a file called chapters.txt that has the chapters in it.

     


     00:00:00=Intro
00:02:12=What are selections
00:03:19=Booleans


     


  


  2. The bash file I run is add_chapters.sh

     


     The code in it is :

     


     #!/bin/bash

input_file="chapters.txt"
output_file="chapters.ffmetadata"

# Create the FFmetadata chapter file
echo ";FFMETADATA1" > "$output_file"

previous_seconds=0

while IFS="=" read -r timestamp chapter_name; do
    # Convert start time to seconds
    seconds=$(date -u -d "1970-01-01 $timestamp" +"%s")

    # Calculate the end time (previous chapter's start time)
    end_seconds=$previous_seconds

    # Update previous_seconds for the next iteration
    previous_seconds=$seconds

    echo "[CHAPTER]" >> "$output_file"
    echo "TIMEBASE=1/1000" >> "$output_file"
    echo "START=${end_seconds}000" >> "$output_file"
    echo "END=${seconds}000" >> "$output_file"
    echo "title=$chapter_name" >> "$output_file"
done < "$input_file"

echo "Chapter file '$output_file' created successfully."

# Run FFmpeg to add chapters to the video
ffmpeg -i input_video.mp4 -i chapters.ffmetadata -map_metadata 1 -c:v copy -c:a copy -y output_video.mp4


     


  


  3. It creates a file called chapters.ffmetadata

     


     ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=


     


     The START and END times aren't being calculated correctly. How can I fix this ?

     


  


  


  ---

  


  UPDATE #1

  


  I'm almost there thanks to @Freeman code / answer.

  


  The issues in the generated
chapters.ffmetadata file are just.

  


  


  1. The first START= and END= are 0000

     


  


  2. The Intro Chapter doesn't show up (most likely caused by the first START= and END= being 0000)

     


  


  3. The Chapters seem to be shifted down by one timecode line (most likely caused by the first START= and END= being 0000)

     


      ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections ?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=4459000
title=

     


  


  


  ---

  


  UPDATE #2

  


  Strange ; I tried the changes @Freeman suggested but an error comes up now.

  


  Chapter end time 0 before start 199000
chapters.ffmetadata : Cannot allocate memory

  


  ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=4459000
title=


  


  ---

  


  UPDATE #3 using his awk changes

  


  ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=


  


• doc : Merge doc/dev_community/* and Code of Conduct into a seperate file

  8 février 2023, par Thilo Borgmann

  doc : Merge doc/dev_community/* and Code of Conduct into a seperate file
  Remove doc/dev_communit markup files completely as they are at the wrong place.
  
  Create a new community page, merging all of doc/dev_community and subsection Code of Conduct into a common place.
  
  The corresponding patch to ffmpeg-web puts the Organisation & Code of Conduct into a seperate community chapter on the FFmpeg website.
  

  • [DH] doc/Makefile
  • [DH] doc/community.texi
  • [DH] doc/dev_community/community.md
  • [DH] doc/dev_community/resolution_process.md
  • [DH] doc/developer.texi
  • [DH] doc/mailing-list-faq.texi