[FFmpeg-user] Converting DVCPRO in AVI wrapper to .dv, missing audio stream

[Kieran O Leary]

Hi,



On Wed, 13 Nov 2019, 15:23 Joanna White via ffmpeg-user, <
ffmpeg-user at ffmpeg.org> wrote:

>
> >> On 13 Nov 2019, at 13:55, Kieran O Leary <kieran.o.leary at gmail.com>
> wrote:
> >>
> >> Hi
> >>
> >> codec to the .dv wrapper so
> >> that it's explicit when committed to long-term LTO storage that it's a
> DV
> >> file.
> >
> >
> > Why is the benefit to removing the container here?
>
> Removal of AVI across all assets for normalisation, also the mediainfo
> FileExtension_Invalid I’m reading as a pointer that it needs to be
> alternative to AVI?
>

No, mediainfo is saying that your files is actually an Apple QuickTime MOV
that someone (or an app) renamed to AVI. It's not AVI at all.



> > The extra audio stream in your source is probably just a duplicate of the
> > pcm stream that is interleaved in your DV stream. You might have to
> double
> > check that.
> > Anyhow DV most likely can't store an extra audio channel as you're just
> > demuxing the DV stream itself. You'll need to use a container or just
> leave
> > the Avi file as Kato retain that I'd imagine.
> >
>
> I’ve been made aware that the .dv choice only supports a stereo pair and
> that this might be the problem.  It’s passing one channel but it’s wrong
> and the audio is mute on playback.
>

Your ffmpeg command is just remuxing the DV stream as is. Some capture
tools tend to copy the audio stream in the DV stream as a seperate track,
but the seperate audio track is really just identical to what's in the DV
stream.


> Might move to an MKV option to normalise assets as I see that dv was a bad
> choice. Will MKV work for dvcam?
>


MKV will work but perhaps all you need to do is rename to MOV, document the
action and leave it as is? Less risk and work that way.

Best,

Kieran.



> Many thanks,
> Joanna
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