[FFmpeg-devel] [PATCH v9] lavc/rawdec: Remove monowhite switching code for 1 bpp AVI without a palette

[wm4]

On Sat, 13 Feb 2016 13:09:48 +0100
Mats Peterson <matsp888-at-yahoo.com at ffmpeg.org> wrote:

> On 02/13/2016 01:03 PM, Mats Peterson wrote:
> > On 02/13/2016 01:00 PM, Mats Peterson wrote:  
> >> On 02/13/2016 12:58 PM, Mats Peterson wrote:  
> >>> On 02/13/2016 12:57 PM, Mats Peterson wrote:  
> >>>> On 02/13/2016 12:54 PM, Mats Peterson wrote:  
> >>>>> On 02/13/2016 12:52 PM, Mats Peterson wrote:  
> >>>>>>>> just double checked, this is not the case in written pal8 nut files
> >>>>>>>> nor does the nut spec say anything about that.
> >>>>>>>>  
> >>>>>>>
> >>>>>>> Then check an odd-width nut file like the one below. And FFmpeg
> >>>>>>> doesn't
> >>>>>>> care about specs when using "-vcodec copy". The stride will be the
> >>>>>>> one
> >>>>>>> of the original data, whether it's 2, 4 or some other amount of
> >>>>>>> bytes.
> >>>>>>>  
> >>>>>
> >>>>> The stride will be *aligned* to 2, 4 or some other amount of bytes.
> >>>>>
> >>>>> Mats
> >>>>>  
> >>>>
> >>>> Try "ffmpeg -i 8bpp_129.avi -vcodec rawvideo 8bpp_129.nut" with the
> >>>> file
> >>>> below. It will have a stride aligned to 4 bytes like the original AVI
> >>>> file, and per the Microsoft specification, since it doesn't "-vcodec
> >>>> copy" won't touch the video data.
> >>>>
> >>>> https://drive.google.com/open?id=0B3_pEBoLs0faekxWUTdkVGNTTlk
> >>>> _______________________________________________  
> >>>
> >>> I mean "ffmpeg -i 8bpp_129.avi -vcodec copy 8bpp_129.nut" of course.
> >>>
> >>> Mats
> >>>  
> >>
> >> The stride will be 132 bytes, divisible by 4, rather than 129 bytes.
> >>
> >> Mats
> >>  
> >
> > Now the problem is that it won't show any video, since the incorrect
> > codec tag RGB[15] will be written to the nut file, and it's not possible
> > to use "-vtag" to set tha PAL[8] codec tag, but if you use "-v debug"
> > you will see that the stride is 132 bytes.
> >
> > Mats
> >
> > _______________________________________________  
> 
> What's more, no palette will be included in the frames, since "-vcodec 
> copy" once again doesn't touch the original AVI data. So it's pretty 
> useless to use "-vcodec copy" for pal8.

Why are you talking with yourself on the ML? Nobody is going to read
everything you post. You just replied to yourself 7 times!

If you want input from others, you need to properly communicate your
issues. This includes:
- thinking before posting
- summarizing the issues in a CONCISE and short way
- not confusing yourself and others with hundreds of follow-ups