[FFmpeg-user] Muxing audio-only MXF

Erik Dobberkau erik.dobberkau at gmail.com
Fri Dec 1 13:25:19 EET 2017


Am Freitag, 1. Dezember 2017 schrieb Robert Krüger :

> Hi Kieran,
>
> On Thu, Nov 30, 2017 at 5:39 PM, Kieran O Leary <kieran.o.leary at gmail.com
> <javascript:;>>
> wrote:
>
> > On Thu, Nov 30, 2017 at 4:38 PM, Kieran O Leary
> > <kieran.o.leary at gmail.com <javascript:;>> wrote:
> > > Hi,
> > >
> > > On Thu, Nov 30, 2017 at 3:46 PM, Robert Krüger
> > > <krueger at lesspain.software> wrote:
> > >> Hi,
> > >>
> > >> is there a way to mux an mxf file only containing a pcm audio stream?
> > When
> > >
> > > You could try using the op-atom muxer as it looks like your command is
> > > defaulting to op1a. Add -f  mxf_opatom to your command line.
> > > ffmpeg -i
> > > /Users/krueger/lesspain/samples/software/compressor/
> > compressor4_1080_25p_apple_devices_best_compat_2s.m4v
> > > -vn -c:a pcm_s16le -f mxf_opatom ~/tmp/ffmpeg_pcm16_rewrap.mxf
> > >
> > > [...]
> > >
> > >>
> > >> Is this a conscious limitation of the muxer or am I missing a command
> > line
> > >> option?
> > >>
> > >
> > > It looks like it. The reasons why I suggested trying OP-Atom is that
> > > this seems to be performing a specific check for OP1a.
>
>
Which is wrong, btw. There is a spec for MXF_OP1a_AES3 to wrap the
respective audio without a picture essence. I would guess MCA labels will
have to be provided though, and also the audio samples would have to be
formatted to AES, which ffmpeg afaik currently doesn't do.

Best,
Erik


More information about the ffmpeg-user mailing list