[FFmpeg-user] Creating interlaced DV AVI material from a frame sequence

[Yellow Penguin]

I think you need to add -target pal-dv to the last step, so

ffmpeg -i ProblemFileAudio.wav -i Merged\ProblemFileFixed_%05d.png -vf
tinterlace=0 -aspect 4/3 -target pal-dv ProblemFileFixed.dv

On Wed, Jan 15, 2020 at 12:43 PM Thomas Mechau <ThomasMechau at compuserve.com>
wrote:

> Hello,
>
> I have kind of a legacy problem:
>
> Several years ago I had some Super 8 cine material transferred
> professionally to miniDV cassettes. I then imported that DV video as
> native PAL DV AVI files, i.e. 50i video with a resolution of 720x576
> (non-square) pixels.
>
> Since one section of the footage contained a lot of critical dust
> specks, I needed to remove them by retouching picture by picture. The
> stills exported from Premiere PRO are de-interlaced (as is the Premiere
> single-frame preview), but often the dust specks affect two fields on
> adjacent frames, so even if the problem seems fixed in the preview after
> importing a retouched still, it is nevertheless visible during playback
> when that field which was hidden by the deinterlacing becomes part of
> the interlaced stream again.
>
> Therefore I tried to find a way to extract the individual fields and
> retouch them.
>
> The following two ffmpeg commands did the trick:
>
> ffmpeg -i ProblemFile.avi -vf field=top Top\ProblemFile_%05d.png
> ProblemFileAudio.wav
> ffmpeg -i ProblemFile.avi -vf field=bottom Bottom\ProblemFile_%05d.png
>
> This creates one audio file and two sets of sequentially numbered PNG
> images in the folders Top and Bottom. I can then use Advanced Renamer to
> adapt the start numbers and the number step of the two sets (00000,
> 00002, 00004, ...; 00001, 00003, 00005, ...) so that a new folder Merged
> contains one sinlge set of contiguously numbered images, which are 288
> pixels high and represent the individual fields of the DV frames, i.e.
> have half the frame rate of the original video.
>
> I can then load the required frames into an image editor like Photoshop
> to retouch the dust specks (a tedious job).
>
> So far, so good. My problem is now that the set of updated PNG images
> needs to be converted back to an interlaced AVI video file.
>
> After much research and experimentation I found that the following
> command delivers a useable video file(50i plus sound):
>
> ffmpeg -i ProblemFileAudio.wav -i Merged\ProblemFileFixed_%05d.png -vf
> tinterlace=0 -aspect 4/3 ProblemFileFixed.dv
>
> However, the result is a QuickTime file, and I need a DV-PAL AVI file
> for my workflow.
>
> Any ideas how this can be achieved, possibly in just one step?
>
> Many Thanks!
>
> Thomas
>
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