[FFmpeg-user] using -vtag on input files

Roee Kashi galacap at gmail.com
Thu Apr 2 17:11:05 CEST 2015

first, since my rawvideo input is YV12 and there's no such pix_fmt, yuv420p
without vtag results with a blue-pink video output.
second, before vtag supported input files, i had to convert the file first
to avi with -vcodec copy, and then convert it to mpeg4 or something, which
takes forever.

i think this thread could shed some light on this matter (last message is
the most important i think):


2015-04-02 17:53 GMT+03:00 tim nicholson <nichot20-at-yahoo.com at ffmpeg.org>:

> On 02/04/15 15:22, Roee Kashi wrote:
> > Hi,
> >
> > with the older ffmpeg version (described earlier), my command line looks
> > like this:
> > "ffmpeg.exe -f rawvideo -vcodec rawvideo -s 704x576 -r 25 -pix_fmt
> yuv420p
> > -vtag YV12 -i raw.yuv -f avi -qscale 0 out.avi"
> Ahh, so you are using the pix_fmt to specify the input...
> What happened on the older version if you left the -vtag off? I think
> its always only been an output only option, and istr a patch to fail
> options put in the wrong place.
> What happens if you move the option to the output side on a current build?
> >
> > with newer version, the output of the same command is:
> > [...]
> --
> Tim.
> Key Fingerprint 38CF DB09 3ED0 F607 8B67 6CED 0C0B FC44 8B0B FC83
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