@@ -611,7 +611,6 @@ static int acrossfade_config_output(AVFilterLink *outlink)

     outlink->time_base   = ctx->inputs[0]->time_base;

     outlink->channel_layout = ctx->inputs[0]->channel_layout;

     outlink->channels = ctx->inputs[0]->channels;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     switch (outlink->format) {

     case AV_SAMPLE_FMT_DBL:  s->crossfade_samples = crossfade_samples_dbl;  break;

@@ -77,7 +77,6 @@ static int config_props_output(AVFilterLink *outlink)

     asns->fifo = av_audio_fifo_alloc(outlink->format, outlink->channels, asns->nb_out_samples);

     if (!asns->fifo)

         return AVERROR(ENOMEM);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     return 0;

 }

@@ -1046,8 +1046,6 @@ static int config_props(AVFilterLink *inlink)

     int sample_rate = (int)inlink->sample_rate;

     int channels = av_get_channel_layout_nb_channels(inlink->channel_layout);

-    ctx->outputs[0]->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-

     return yae_reset(atempo, format, sample_rate, channels);

 }

@@ -531,7 +531,6 @@ static int config_output(AVFilterLink *outlink)

     if (err)

         return err;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     s->compand = compand_delay;

     return 0;

 }

@@ -305,12 +305,6 @@ static int config_input(AVFilterLink *inlink)

     return 0;

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 static inline double fade(double prev, double next, int pos,

                           double *fade_factors[2])

 {

@@ -721,7 +715,6 @@ static const AVFilterPad avfilter_af_dynaudnorm_outputs[] = {

     {

         .name          = "default",

         .type          = AVMEDIA_TYPE_AUDIO,

-        .config_props  = config_output,

         .request_frame = request_frame,

     },

     { NULL }

@@ -153,13 +153,6 @@ static int config_input(AVFilterLink *inlink)

     return 0;

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-

-    return 0;

-}

-

 static double compute_rms(SilenceRemoveContext *s, double sample)

 {

     double new_sum;

@@ -463,7 +456,6 @@ static const AVFilterPad silenceremove_outputs[] = {

     {

         .name          = "default",

         .type          = AVMEDIA_TYPE_AUDIO,

-        .config_props  = config_output,

         .request_frame = request_frame,

     },

     { NULL }

@@ -300,7 +300,6 @@ static int config_output(AVFilterLink *outlink)

         s->scale += s->window_func_lut[i] * s->window_func_lut[i];

     }

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));

     outlink->sample_aspect_ratio = (AVRational){1,1};

     outlink->w = s->w;

@@ -1097,7 +1097,6 @@ static int ff_filter_frame_needs_framing(AVFilterLink *link, AVFrame *frame)

     int nb_channels = av_frame_get_channels(frame);

     int ret = 0;

-    link->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     /* Handle framing (min_samples, max_samples) */

     while (insamples) {

         if (!pbuf) {

@@ -337,8 +337,6 @@ static int config_video_output(AVFilterLink *outlink)

     DRAW_RECT(ebur128->graph);

     DRAW_RECT(ebur128->gauge);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-

     return 0;

 }

@@ -398,8 +396,6 @@ static int config_audio_output(AVFilterLink *outlink)

             return AVERROR(ENOMEM);

     }

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-

 #if CONFIG_SWRESAMPLE

     if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) {

         int ret;

@@ -180,8 +180,6 @@ static int config_output(AVFilterLink *outlink)

             }

         }

     }

-

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     return 0;

 }

@@ -62,12 +62,6 @@ static av_cold void uninit(AVFilterContext *ctx)

     av_freep(&s->frames);

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 static int filter_frame(AVFilterLink *inlink, AVFrame *in)

 {

     AVFilterContext *ctx = inlink->dst;

@@ -129,7 +123,6 @@ static const AVFilterPad reverse_outputs[] = {

         .name          = "default",

         .type          = AVMEDIA_TYPE_VIDEO,

         .request_frame = request_frame,

-        .config_props  = config_output,

     },

     { NULL }

 };

@@ -240,7 +233,6 @@ static const AVFilterPad areverse_outputs[] = {

         .name          = "default",

         .type          = AVMEDIA_TYPE_AUDIO,

         .request_frame = areverse_request_frame,

-        .config_props  = config_output,

     },

     { NULL }

 };

@@ -322,7 +322,6 @@ int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink)

         return 0;

     if (fs->eof)

         return AVERROR_EOF;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     input = fs->in_request;

     ret = ff_request_frame(ctx->inputs[input]);

     if (ret == AVERROR_EOF) {

@@ -336,20 +336,6 @@ int ff_request_frame(AVFilterLink *link);

 int ff_filter_frame(AVFilterLink *link, AVFrame *frame);

 /**

- * Flags for AVFilterLink.flags.

- */

-enum {

-

-    /**

-     * Frame requests may need to loop in order to be fulfilled.

-     * A filter must set this flags on an output link if it may return 0 in

-     * request_frame() without filtering a frame.

-     */

-    FF_LINK_FLAG_REQUEST_LOOP = 1,

-

-};

-

-/**

  * Allocate a new filter context and return it.

  *

  * @param filter what filter to create an instance of

@@ -114,12 +114,6 @@ static int config_input(AVFilterLink *inlink)

     return 0;

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 #define OFFSET(x) offsetof(TrimContext, x)

 #define COMMON_OPTS                                                                                                                                                         \

     { "starti",      "Timestamp of the first frame that "                                                                                                        \

@@ -223,7 +217,6 @@ static const AVFilterPad trim_outputs[] = {

     {

         .name         = "default",

         .type         = AVMEDIA_TYPE_VIDEO,

-        .config_props = config_output,

     },

     { NULL }

 };

@@ -378,7 +371,6 @@ static const AVFilterPad atrim_outputs[] = {

     {

         .name         = "default",

         .type         = AVMEDIA_TYPE_AUDIO,

-        .config_props = config_output,

     },

     { NULL }

 };

@@ -285,12 +285,6 @@ static int config_input(AVFilterLink *inlink)

     return 0;

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)

 {

     AVFilterContext *ctx = inlink->dst;

@@ -401,7 +395,6 @@ static const AVFilterPad outputs[] = {

         .name          = "default",

         .type          = AVMEDIA_TYPE_VIDEO,

         .request_frame = request_frame,

-        .config_props  = config_output,

     },

     { NULL }

 };

@@ -467,9 +467,8 @@ static int config_output(AVFilterLink *outlink)

     is_16bit = pix_desc->comp[0].depth == 16;

     s->nb_planes = av_pix_fmt_count_planes(toplink->format);

-    if (s->tblend)

-        outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    else if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)

+    if (!s->tblend)

+        if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)

             return ret;

     for (plane = 0; plane < FF_ARRAY_ELEMS(s->params); plane++) {

@@ -372,7 +372,6 @@ static int config_output(AVFilterLink *outlink)

     fps = av_mul_q(fps, (AVRational){dm->cycle - 1, dm->cycle});

     av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",

            inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->time_base  = inlink->time_base;

     outlink->frame_rate = fps;

     outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

@@ -170,7 +170,6 @@ static int config_output(AVFilterLink *outlink)

     av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",

            inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->frame_rate = fps;

     outlink->time_base = av_mul_q(inlink->time_base, s->pts);

     av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",

@@ -953,7 +953,6 @@ static int config_output(AVFilterLink *outlink)

     const AVFilterLink *inlink =

         ctx->inputs[fm->ppsrc ? INPUT_CLEANSRC : INPUT_MAIN];

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->time_base = inlink->time_base;

     outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

     outlink->frame_rate = inlink->frame_rate;

@@ -639,7 +639,6 @@ static int config_output(AVFilterLink *outlink)

     outlink->frame_rate = s->dest_frame_rate;

     outlink->time_base = s->dest_time_base;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     ff_dlog(ctx,

            "config_output() output time base:%u/%u (%f) w:%d h:%d\n",

@@ -49,7 +49,6 @@ static int config_output_props(AVFilterLink *outlink)

     FrameStepContext *framestep = ctx->priv;

     AVFilterLink *inlink = ctx->inputs[0];

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->frame_rate =

         av_div_q(inlink->frame_rate, (AVRational){framestep->frame_step, 1});

@@ -400,12 +400,6 @@ static int query_formats(AVFilterContext *ctx)

     return ff_set_common_formats(ctx, fmts_list);

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 static av_cold int init(AVFilterContext *ctx)

 {

     IDETContext *idet = ctx->priv;

@@ -440,7 +434,6 @@ static const AVFilterPad idet_outputs[] = {

     {

         .name         = "default",

         .type         = AVMEDIA_TYPE_VIDEO,

-        .config_props = config_output,

         .request_frame = request_frame

     },

     { NULL }

@@ -113,7 +113,6 @@ static int config_out_props(AVFilterLink *outlink)

     // half framerate

     outlink->time_base.num *= 2;

     outlink->frame_rate.den *= 2;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     if (s->lowpass) {

@@ -520,7 +520,6 @@ static int config_output(AVFilterLink *outlink)

 {

     outlink->w = outlink->h = 16;

     outlink->sample_aspect_ratio = av_make_q(1, 1);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     return 0;

 }

@@ -220,12 +220,6 @@ static int config_input(AVFilterLink *inlink)

     return 0;

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 static PullupBuffer *pullup_lock_buffer(PullupBuffer *b, int parity)

 {

     if (!b)

@@ -766,7 +760,6 @@ static const AVFilterPad pullup_outputs[] = {

     {

         .name         = "default",

         .type         = AVMEDIA_TYPE_VIDEO,

-        .config_props = config_output,

     },

     { NULL }

 };

@@ -64,12 +64,6 @@ static av_cold int init(AVFilterContext *ctx)

     return 0;

 }

-static int config_output(AVFilterLink *outlink)

-{

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-    return 0;

-}

-

 static int filter_frame(AVFilterLink *inlink, AVFrame *in)

 {

     AVFilterContext *ctx = inlink->dst;

@@ -128,7 +122,6 @@ static const AVFilterPad random_outputs[] = {

         .name          = "default",

         .type          = AVMEDIA_TYPE_VIDEO,

         .request_frame = request_frame,

-        .config_props  = config_output,

     },

     { NULL }

 };

@@ -373,7 +373,6 @@ static int config_output(AVFilterLink *outlink)

         break;

     case ALTERNATING_RL:

     case ALTERNATING_LR:

-        outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

         fps.den        *= 2;

         tb.num         *= 2;

         break;

@@ -157,7 +157,6 @@ static int config_output(AVFilterLink *outlink)

     av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",

            inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->frame_rate = fps;

     outlink->time_base = av_mul_q(inlink->time_base, s->pts);

     av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",

@@ -116,8 +116,6 @@ static int config_props(AVFilterLink *outlink)

     ff_draw_init(&tile->draw, inlink->format, 0);

     ff_draw_color(&tile->draw, &tile->blank, tile->rgba_color);

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

-

     return 0;

 }

@@ -117,7 +117,6 @@ static int config_out_props(AVFilterLink *outlink)

     int i;

     tinterlace->vsub = desc->log2_chroma_h;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     outlink->w = inlink->w;

     outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD ?

         inlink->h*2 : inlink->h;

@@ -117,7 +117,6 @@ static int config_output(AVFilterLink *outlink)

     outlink->time_base.den = inlink->time_base.den * 2;

     outlink->frame_rate.num = inlink->frame_rate.num * 2;

     outlink->frame_rate.den = inlink->frame_rate.den;

-    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

     return 0;

 }