[Libav-user] Filter initialization change in git relative to 7.0?

[Paul B Mahol]

On Wed, May 14, 2025 at 5:05 AM Andrew Randrianasulu <
randrianasulu at gmail.com> wrote:

> Even if our code compiles it does not work anymore ...
>
> [out @ 0xe1821180] Option 'pix_fmts' is not a runtime option and so
> cannot be set after the object has been initialized
>
>         int ret = 0;  char args[BCTEXTLEN];
>         AVPixelFormat pix_fmt = (AVPixelFormat)avpar->format;
>         snprintf(args, sizeof(args),
>
> "video_size=%dx%d:pix_fmt=%i:time_base=%d/%d:pixel_aspect=%d/%d",
>                 avpar->width, avpar->height,(int)pix_fmt,
>                 st->time_base.num, st->time_base.den, sa_num, sa_den);
>         if( ret >= 0 ) {
>                 filt_ctx = 0;
>                 ret = insert_filter("buffer", args, "in");
>                 buffersrc_ctx = filt_ctx;
>         }
>         if( ret >= 0 )
>                 ret = flip(theta);
>         AVFilterContext *fsrc = filt_ctx;
>         if( ret >= 0 ) {
>                 filt_ctx = 0;
>                 ret = insert_filter("buffersink", 0, "out");
>                 buffersink_ctx = filt_ctx;
>         }
>         if( ret >= 0 ) {
>                 ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
>                         (uint8_t*)&pix_fmt, sizeof(pix_fmt),
>                         AV_OPT_SEARCH_CHILDREN);
>         }
>         if( ret >= 0 )
>                 ret = config_filters(filter_spec, fsrc);
>         else
>                 ff_err(ret, "FFVideoStream::create_filter");
>         return ret >= 0 ? 0 : -1;
>
>
> =========
>
> There is no video filtering example in doc/examples.
>
> How I supposed to know what should be put there now?
>

doc/examples/decode_filter_video.c


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