[FFmpeg-user] does ffmpeg support MVC (3D BluRays)?

[Paul B Mahol]

On Wed, Nov 29, 2023 at 3:25 AM Philippe Cerfon <philcerf at gmail.com> wrote:

> Hey Paul.
>
> On Tue, Nov 28, 2023 at 4:51 PM Paul B Mahol <onemda at gmail.com> wrote:
> > IIRC MVC in h264 is not supported.
>
> What a pity. I've filed https://trac.ffmpeg.org/ticket/10706 in case
> someone is ever going to work on this.
>
>
Ticket is already closed because it is duplicate ticket.


> > stereo3d filter is for anaglyph presentation of decoded 3d frames and
> some
> > other minor features.
> > supporting alternating, top/bottom, left/right etc.
>
> I'm really new to 3D, so may be completely wrong: but as far as I
> understood, quite some end devices (e.g. 3D capable projectors or so)
> expect e.g. side-by-side input, too (i.e. than cannot cope with MVC
> either).
>

stereo3d filter supports converting alternating to side by side conversion,
as evident by really reading filter documentation.


>
> Also, it would have been nice to convert the MVC to a side-by-side
> version and see whether it actually works. Seems so far, there are
> only few ways to decode this. Most people apparently use BD3D2MK3D[0],
> but that's windows only, and as far as I can see not open.
>
> > But as usual:
>
> Well I guess the following are not really useful, if it anyway doesn't
> support MVC, but here they are:
>
> > - missing ffmpeg version
>
> $ ffmpeg -version
> ffmpeg version 6.1-4 Copyright (c) 2000-2023 the FFmpeg developers
> built with gcc 13 (Debian 13.2.0-6)
> configuration: --prefix=/usr --extra-version=4 --toolchain=hardened
> --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
> --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
> --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libcdio --enable-libcodec2 --enable-libdav1d
> --enable-libflite --enable-libfontconfig --enable-libfreetype
> --enable-libfribidi --enable-libglslang --enable-libgme
> --enable-libgsm --enable-libjack --enable-libmp3lame
> --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
> --enable-libopus --enable-libpulse --enable-librabbitmq
> --enable-librist --enable-librubberband --enable-libshine
> --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt
> --enable-libssh --enable-libtheora --enable-libtwolame
> --enable-libvidstab --enable-libvorbis --enable-libvpx
> --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
> --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2
> --enable-omx --enable-openal --enable-opencl --enable-opengl
> --enable-sdl2 --disable-sndio --enable-libjxl --enable-pocketsphinx
> --enable-librsvg --enable-libvpl --disable-libmfx --enable-libdc1394
> --enable-libdrm --enable-libiec61883 --enable-chromaprint
> --enable-frei0r --enable-libsvtav1 --enable-libx264
> --enable-libplacebo --enable-librav1e --enable-shared
> libavutil      58. 29.100 / 58. 29.100
> libavcodec     60. 31.102 / 60. 31.102
> libavformat    60. 16.100 / 60. 16.100
> libavdevice    60.  3.100 / 60.  3.100
> libavfilter     9. 12.100 /  9. 12.100
> libswscale      7.  5.100 /  7.  5.100
> libswresample   4. 12.100 /  4. 12.100
> libpostproc    57.  3.100 / 57.  3.100
>
>
> > - missing full uncut ffmpeg command line and its output
>
> I merely tried on some MKV (which was generated from a BluRay):
> $ ffplay -i a2.mkv -vf stereo3d=sbsr:sbsr
>
> and various oher outbuts. But obviously, the MVC stream is not any of
> the input formats that the filter supports.
>
> > - missing input files
>
> That might be difficult, I mean these are from BluRays, so the
> material is a) super big, b) copyrighted.
>
>
> > IIRC H.264 MVC is alternating frames 3d format.
>
> As far as I understood it, it's rather that the H264 contains two
> streams: a "normal" (AVC) one, which I think it s the left eye, and
> the MVC stream, which is like a diff from the left to the right eye.
>

If video is in two different streams use stereo3d filter in combination
with framepack filter to convert it to side by side.


> Thanks,
> Philippe.
>
> [0] https://download.videohelp.com/r0lZ/BD3D2AVS/index.html
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