I created this issue on the bugtracker but I'm trying to format it properly for this channel https://trac.ffmpeg.org/ticket/7947 The actual filter change was written by Calvin Walton <calvin.wal...@kepstin.ca>
--- diff --git a/doc/filters.texi b/doc/filters.texi index ec1c7c7591..332f4ddc80 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -8584,6 +8584,17 @@ The thickness of the drawn box. These constants allow the @var{x}, @var{y}, @var{w}, @var{h} and @var{t} expressions to refer to each other, so you may for example specify @code{y=x/dar} or @code{h=w/dar}. +@item pict_type +A 1 character description of the current packet's input picture type. + +@item pkt_pos +The current packet's position in the input datastream (in bytes from the head of the source file) + +@item pkt_duration +The current packet's input duration + +@item pkt_size +The current packet's input size (in bytes) @end table @@ -9032,6 +9043,14 @@ The first argument is mandatory and specifies the metadata key. The second argument is optional and specifies a default value, used when the metadata key is not found or empty. +The use of the term metadata in ffmpeg refers to extra data, +often user-provided or generated live during decode by other filters. + +If you're trying to read data from teh frames in a stream or file, run +@code{ffprobe -show_frames}. If the information doesn't show up between +@code{[FRAME]} and @code{[/FRAME]} in the form @code{TAG:[metadata_key]=[metadata_value]} +then it won't be visible to this function. + @item n, frame_num The frame number, starting from 0. diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c index 01cd7fa122..8f4badbdb5 100644 --- a/libavfilter/vf_drawtext.c +++ b/libavfilter/vf_drawtext.c @@ -88,6 +88,9 @@ static const char *const var_names[] = { "x", "y", "pict_type", + "pkt_pos", + "pkt_duration", + "pkt_size", NULL }; @@ -125,6 +128,9 @@ enum var_name { VAR_X, VAR_Y, VAR_PICT_TYPE, + VAR_PKT_POS, + VAR_PKT_DURATION, + VAR_PKT_SIZE, VAR_VARS_NB }; @@ -1516,6 +1522,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame) NAN : frame->pts * av_q2d(inlink->time_base); s->var_values[VAR_PICT_TYPE] = frame->pict_type; + s->var_values[VAR_PKT_POS] = frame->pkt_pos; + s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base); + s->var_values[VAR_PKT_SIZE] = frame->pkt_size; s->metadata = frame->metadata; draw_text(ctx, frame, frame->width, frame->height); --- _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".