Re: [FFmpeg-devel] [PATCH] avfilter/buffersrc: limit link variance logs below debug loglevel

[Gyan Doshi <ffmpeg@gyani.pro>]

On 2024-01-26 07:39 pm, Gyan Doshi wrote:
> The video param change check will print loglines below debug level
> for each frame which is different from the inlink parameters. This
> can spam the console. It is now printed at warning level once for
> each param change else it is kept at debug level.
>
> Partially addresses #10823
Plan to push tomorrow.

Regards,
Gyan

> ---
>   libavfilter/buffersrc.c | 40 +++++++++++++++++++++++++++-------------
>   1 file changed, 27 insertions(+), 13 deletions(-)
>
> diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
> index afe69433b2..6e450ff6b7 100644
> --- a/libavfilter/buffersrc.c
> +++ b/libavfilter/buffersrc.c
> @@ -49,10 +49,10 @@ typedef struct BufferSourceContext {
>       unsigned          nb_failed_requests;
>   
>       /* video only */
> -    int               w, h;
> -    enum AVPixelFormat  pix_fmt;
> -    enum AVColorSpace color_space;
> -    enum AVColorRange color_range;
> +    int               w, h, prev_w, prev_h;
> +    enum AVPixelFormat  pix_fmt, prev_pix_fmt;
> +    enum AVColorSpace color_space, prev_color_space;
> +    enum AVColorRange color_range, prev_color_range;
>       AVRational        pixel_aspect;
>   
>       AVBufferRef *hw_frames_ctx;
> @@ -66,16 +66,30 @@ typedef struct BufferSourceContext {
>   
>       int eof;
>       int64_t last_pts;
> +    int link_delta, prev_delta;
>   } BufferSourceContext;
>   
>   #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)\
> -    if (c->w != width || c->h != height || c->pix_fmt != format ||\
> -        c->color_space != csp || c->color_range != range) {\
> -        av_log(s, AV_LOG_INFO, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
> +    c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
> +                    c->color_space != csp || c->color_range != range;\
> +    c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
> +                    c->prev_color_space != csp || c->prev_color_range != range;\
> +    if (c->link_delta) {\
> +        int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
> +        av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
> +        av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
>                  c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range),\
>                  width, height, format, av_color_space_name(csp), av_color_range_name(range),\
>                  av_ts2timestr(pts, &s->outputs[0]->time_base));\
> -        av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
> +    }\
> +    if (c->prev_delta) {\
> +        if (!c->link_delta)\
> +            av_log(s, AV_LOG_VERBOSE, "video frame properties congruent with link at pts_time: %s\n", av_ts2timestr(pts, &s->outputs[0]->time_base));\
> +        c->prev_w = width;\
> +        c->prev_h = height;\
> +        c->prev_pix_fmt = format;\
> +        c->prev_color_space = csp;\
> +        c->prev_color_range = range;\
>       }
>   
>   #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
> @@ -111,12 +125,12 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
>       switch (ctx->filter->outputs[0].type) {
>       case AVMEDIA_TYPE_VIDEO:
>           if (param->format != AV_PIX_FMT_NONE) {
> -            s->pix_fmt = param->format;
> +            s->pix_fmt = s->prev_pix_fmt = param->format;
>           }
>           if (param->width > 0)
> -            s->w = param->width;
> +            s->w = s->prev_w = param->width;
>           if (param->height > 0)
> -            s->h = param->height;
> +            s->h = s->prev_h = param->height;
>           if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
>               s->pixel_aspect = param->sample_aspect_ratio;
>           if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
> @@ -128,9 +142,9 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
>                   return AVERROR(ENOMEM);
>           }
>           if (param->color_space != AVCOL_SPC_UNSPECIFIED)
> -            s->color_space = param->color_space;
> +            s->color_space = s->prev_color_space = param->color_space;
>           if (param->color_range != AVCOL_RANGE_UNSPECIFIED)
> -            s->color_range = param->color_range;
> +            s->color_range = s->prev_color_range = param->color_range;
>           break;
>       case AVMEDIA_TYPE_AUDIO:
>           if (param->format != AV_SAMPLE_FMT_NONE) {

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