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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 to seal subtitle on the video permanently ? ffmpeg

  10 octobre 2017, par Robert Choy

  I am able to add subtitle to my mp4 ; however, when i upload it on youtube, the subtitle is gone, disappeared.

  So i am asking if there is any method to make the subtitle on the video (forever, permanently, seal it, burn it, force everyone watch the video with subtitle, can’t even turn it off manually)

  ffmpeg -i video.mp4 -i subtitle.srt -c copy -c:s mov_text -disposition:s:0 forced \
  
  permanently-subtitle-video-please.mp4

  i dont like the design of youtube subtitle, so i would love to upload my video + subtitle as one thing.

  sorry i a not an English native speaker, hope you understand what i am trying to ask. thanks

• Jwplayer function snapshot using ffmpeg and php

  27 octobre 2013, par Offboard

  before anything I'm using version 6, then the Snapshot plugin does not work.

  I'm finally with 2 questions, take a sequence of photos of a percentage of the video, so googled it and got this code from ffmpeg :

  ffmpeg -i video.mp4 -r 0.5 -f image2 output-%05d.jpeg

  so far so good, but I do not know how to take a screen shot of the video by setting the time, if I'm right this code is per frame.

  I searched again to get the function that calls the images, to generate good is quite simple, but the problem is that I found the pictures looks is all in one look.

  if anyone has any function or know how to do please tell me : D
  My English sucks, so do not call if I messed up.