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    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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  • List of compatible distributions

    26 avril 2011, par

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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
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Sur d’autres sites (2427)

  • FFMPEG Re-muxing .MKV to MP4\MV4 while retaining Dolby Digital Plus JOC [closed]

    31 décembre 2020, par David F

    My ask is, does anyone have any knowledge of how to remux and keep Enhanced AC-3 with Joint Object Control with FFMPEG.

    


    I would be grateful if anyone could help me out here. I'm remuxing a number of video files from .MKV to .MP4\M4V so they play on the Apple platform (including the TV App). It's important NOT to convert, but to remux.

    


    I have achieved the ability to remux 4K HDR with Dolby Digital Plus in a .MKV to 4K HDR with Dolby Digtial 5.1. MP4. The issue is retaining the Dolby Digital Plus. This contains the ATMOS information for object based sound.

    


    The media players on Apple reports Dolby Digital Plus for the .MKV and Dolby Digital 5.1 for .MP4. I know Dolby Labs to allow free remuxing of Dolby Digital Plus/ Atmos with sample code and information they have uploaded onto Github for developers.

    


    I'm using FFMPEG with the following command :-

    


    ffmpeg -i original.mkv -c:v copy -c:a eac3 -tag:v hvc1 output.mp4

    


    Resulting output from MediaInfo (note .MKV contains only 1 video and 1 audio track)

    


    Audio -----Original.mkv

    


      

    • ID : 2

      • 


    • Format : E-AC-3 JOC

      • 


    • Format/Info : Enhanced AC-3 with Joint
Object Coding

      • 


    • Commercial name : Dolby Digital Plus with Dolby
Atmos

      • 


    • Codec ID : **A_**EAC3

      • 


    • Duration : 51 min 51 s

      • 


    • Bit rate mode : Constant

      • 


    


    Audio ----- Remuxed.mp4

    


      

    • ID : 2

      • 


    • Format : E-AC-3

      • 


    • Format/Info : Enhanced AC-3

      • 


    • Commercial name : Dolby Digital Plus

      • 


    • Codec ID : ec-3

      • 


    • Duration : 51 min 51 s

      • 


    • Bit rate mode : Constant

      • 


    


    The remux operation finished in about 1 minute for a 8Gb 4k video file, so I know there is no reencoding.

    


    I can see that .mp4 can take E-AC-3 Joint Object Control (JOC) with the demo files from Dolby labs.

    


    I've also remuxed an MKV to MKV and able to see the same result. The JOC markings have been removed with FFMPEG

    


    Thanks in advanced.

    


    David

    


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    10 septembre 2009

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  • FFMPEG Re-muxing .MKV to MP4\MV4 while retaining Dolby Digital Plus [closed]

    30 décembre 2020, par David F

    I would be grateful if anyone could help me out here. I'm remuxing a large number of video files from .MKV to .MP4\M4V so they play on the Apple platform (including the TV App) without any issues. It has been a bit of a learning curve, but I’m so close now. It's important NOT to convert, but to remux.

    


    I have achieved the ability to remux 4K HDR with Dolby Digital Plus in a .MKV to 4K HDR with Dolby Digtial 5.1. MP4. The issue is retaining the Dolby Digital Plus. This contains the ATMOS information for object based sound.

    


    The media players on Apple reports Dolby Digital Plus for the .MKV and Dolby Digital 5.1 for .MP4

    


    I'm using FFMPEG with the following command :-

    


    ffmpeg -i original.mkv -c:v copy -c:a eac3 -tag:v hvc1 output.mp4

    


    Output from MediaInfo (note .MKV contains only 1 video and 1 audio track)

    


    Audio -----Original.mkv

    


      

    • ID : 2

      • 


    • Format : E-AC-3 JOC

      • 


    • Format/Info : Enhanced AC-3 with Joint
Object Coding

      • 


    • Commercial name : Dolby Digital Plus with Dolby
Atmos

      • 


    • Codec ID : **A_**EAC3

      • 


    • Duration : 51 min 51 s

      • 


    • Bit rate mode : Constant

      • 


    


    Audio ----- Remuxed .mp4

    


      

    • ID : 2

      • 


    • Format : E-AC-3

      • 


    • Format/Info : Enhanced AC-3

      • 


    • Commercial name : Dolby Digital Plus

      • 


    • Codec ID : ec-3

      • 


    • Duration : 51 min 51 s

      • 


    • Bit rate mode : Constant

      • 


    


    The remux operation finished in about 1 minute for a 8Gb 4k video file, so we I know there is no reencoding. My theory is the stream is still a E-AC-3 with Joint Object Control, but its marked as a E-AC-3.

    


    I can see that .mp4 can take E-AC-3 Joint Object Control (JOC) with the demo files from Dolby labs.

    


    I've also remuxed an MKV to MKV and able to see the same result. The JOC markings have been removed with FFMPEG

    


    My ask is, does anyone have any knowledge of how to remux and keep Enhanced AC-3 with Joint Object Control with FFMPEG. Does FFMPEG support this ?

    


    Or know if just editing the Format, Format/Info, and Code ID is enough and the sound information in my .MP4\M4V is E-AC-3 JOC. If so can I just edit the media info, if so how ?

    


    I know Dolby Labs to allow free remuxing of Dolby Digital Plus/ Atmos with sample code and information they have uploaded onto Github for developers. I just wonder if FFMPEG supports it

    


    Thanks in advanced.

    


    David

    


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