2011/2/17 Jérémie Klein <[email protected]>
> 2011/2/17 Gilles Maire <[email protected]>
>
> > 2011/2/16 Jérémie Klein <[email protected]>
> >
> > > Hi all,
> > >
> > > To start making my hand dirty with ffmpeg, i tried to adapt the sample
> > > available on the site to the git version of ffmpeg
> > > (using avcodec_decode_video2, sws_alloc_context, sws_init_context and
> > > sws_scale), but the only thing i obtain at the end is a serie of really
> > > nice
> > > black pictures.
> > >
> > > When viewing the file in hex format, i obtain the good values for the
> > > header
> > > (P6.512 512.255) butthen, the the image is filled with 0x00 until the
> end
> > > (which explains the black).
> > > I must be missing something.
> > >
> > > I have tested the examples one month ago and it worked with a mpeg2
> file.
> > Don't you have 5 black images ate the begin of the video ?
> >
>
> Hello, thank you for your prompt answer.
>
> I first thought of it, so i checked with frames beetwen the 10000th and
> 15000th but i got the same issue.
> I thought that maybe the video i was using had something wrong, so i made
> my
> own video (using ffmpeg) with flat images but the result is still the same
> (black images).
>
>
In your code I don't recognize a sequence and you don't put null value
Try to replace
img_convert_ctx = sws_alloc_context();
av_set_int(img_convert_ctx, "srcw", pCodecCtx->width);
av_set_int(img_convert_ctx, "srch", pCodecCtx->height);
av_set_int(img_convert_ctx, "dstw", pCodecCtx->width);
av_set_int(img_convert_ctx, "dsth", pCodecCtx->height);
av_set_int(img_convert_ctx, "src_format", pCodecCtx->pix_fmt);
av_set_int(img_convert_ctx, "dst_format", PIX_FMT_RGB24);
av_set_int(img_convert_ctx, "sws_flags", SWS_BICUBIC);
av_set_int(img_convert_ctx, "src_range", 1);
av_set_int(img_convert_ctx, "dst_range", 1);
by
img_convert_ctx = sws_getContext(pCodecCtx->width,
pCodecCtx->height,
pCodecCtx->pix_fmt,
pCodecCtxt->width,
pCodecCtx->height,
PIX_FMT_RGB24,
SWS_BICUBIC,(int)NULL,NULL,NULL);
To see ..
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