PR #21766 opened by Adam Jensen (acj) URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21766 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21766.patch
loudnorm provides stats output that's meant to be used for two-pass normalization. These stats are often interleaved with ffmpeg's stream descriptions and other output, making them difficult to parse and pass to the second pass. The new stats_file option enables writing the stats to a separate file, or to standard output, for simple parsing and other programmatic usage. Signed-off-by: Adam Jensen <[email protected]> >From 9437d3e688fd48b9163e3d649eec500734ee6294 Mon Sep 17 00:00:00 2001 From: Adam Jensen <[email protected]> Date: Sun, 15 Feb 2026 11:28:25 -0500 Subject: [PATCH] avfilter/af_loudnorm: add stats_file option loudnorm provides stats output that's meant to be used for two-pass normalization. These stats are often interleaved with ffmpeg's stream descriptions and other output, making them difficult to parse and pass to the second pass. The new stats_file option enables writing the stats to a separate file, or to standard output, for simple parsing and other programmatic usage. Signed-off-by: Adam Jensen <[email protected]> --- doc/filters.texi | 6 ++++++ libavfilter/af_loudnorm.c | 41 +++++++++++++++++++++++++++++++++++---- 2 files changed, 43 insertions(+), 4 deletions(-) diff --git a/doc/filters.texi b/doc/filters.texi index 80a1bda322..9f0218f33a 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -5914,6 +5914,12 @@ Options are true or false. Default is false. @item print_format Set print format for stats. Options are summary, json, or none. Default value is none. + +@item stats_file +If specified, the filter will use the named file to save the stats. The +format of the file is controlled by @option{print_format}, defaulting to +json. When @code{-} is given as the filename, stats are written to standard +output. @end table @section lowpass diff --git a/libavfilter/af_loudnorm.c b/libavfilter/af_loudnorm.c index 2636f2245e..23006edb56 100644 --- a/libavfilter/af_loudnorm.c +++ b/libavfilter/af_loudnorm.c @@ -20,6 +20,8 @@ /* http://k.ylo.ph/2016/04/04/loudnorm.html */ +#include "libavutil/avstring.h" +#include "libavutil/file_open.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "avfilter.h" @@ -64,6 +66,7 @@ typedef struct LoudNormContext { int linear; int dual_mono; enum PrintFormat print_format; + char *stats_file_str; double *buf; int buf_size; @@ -121,6 +124,7 @@ static const AVOption loudnorm_options[] = { { "none", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NONE}, 0, 0, FLAGS, .unit = "print_format" }, { "json", 0, 0, AV_OPT_TYPE_CONST, {.i64 = JSON}, 0, 0, FLAGS, .unit = "print_format" }, { "summary", 0, 0, AV_OPT_TYPE_CONST, {.i64 = SUMMARY}, 0, 0, FLAGS, .unit = "print_format" }, + { "stats_file", "set stats output file", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, { NULL } }; @@ -824,6 +828,8 @@ static av_cold void uninit(AVFilterContext *ctx) LoudNormContext *s = ctx->priv; double i_in, i_out, lra_in, lra_out, thresh_in, thresh_out, tp_in, tp_out; int c; + FILE *stats_file = NULL; + char *stats = NULL; if (!s->r128_in || !s->r128_out) goto end; @@ -848,13 +854,31 @@ static av_cold void uninit(AVFilterContext *ctx) tp_out = tmp; } + + if (s->stats_file_str) { + if (s->print_format == NONE) + s->print_format = JSON; + + if (!strcmp(s->stats_file_str, "-")) { + stats_file = stdout; + } else { + stats_file = avpriv_fopen_utf8(s->stats_file_str, "w"); + if (!stats_file) { + int err = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n", + s->stats_file_str, av_err2str(err)); + goto end; + } + } + } + switch(s->print_format) { case NONE: break; case JSON: - av_log(ctx, AV_LOG_INFO, - "\n{\n" + stats = av_asprintf( + "{\n" "\t\"input_i\" : \"%.2f\",\n" "\t\"input_tp\" : \"%.2f\",\n" "\t\"input_lra\" : \"%.2f\",\n" @@ -877,11 +901,13 @@ static av_cold void uninit(AVFilterContext *ctx) s->frame_type == LINEAR_MODE ? "linear" : "dynamic", s->target_i - i_out ); + av_log(ctx, AV_LOG_INFO, "\n%s", stats); + if (stats_file) + fprintf(stats_file, "%s", stats); break; case SUMMARY: - av_log(ctx, AV_LOG_INFO, - "\n" + stats = av_asprintf( "Input Integrated: %+6.1f LUFS\n" "Input True Peak: %+6.1f dBTP\n" "Input LRA: %6.1f LU\n" @@ -905,10 +931,17 @@ static av_cold void uninit(AVFilterContext *ctx) s->frame_type == LINEAR_MODE ? "Linear" : "Dynamic", s->target_i - i_out ); + av_log(ctx, AV_LOG_INFO, "\n%s", stats); + if (stats_file) + fprintf(stats_file, "%s", stats); break; } end: + if (stats) + av_free(stats); + if (stats_file && stats_file != stdout) + fclose(stats_file); if (s->r128_in) ff_ebur128_destroy(&s->r128_in); if (s->r128_out) -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
