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new d25d133df3 avcodec/libx265: add pass and x265-stats option
d25d133df3 is described below
commit d25d133df36a05d80c6dfc4f1f4da36220822155
Author: Werner Robitza <[email protected]>
AuthorDate: Thu Dec 18 12:47:17 2025 +0100
Commit: Gyan Doshi <[email protected]>
CommitDate: Tue Jan 20 10:10:26 2026 +0000
avcodec/libx265: add pass and x265-stats option
Add support for standard -pass and -passlogfile options, matching the
behavior
of libx264.
Add the -x265-stats option to specify the stats filename.
Update documentation.
Signed-off-by: Werner Robitza <[email protected]>
---
doc/encoders.texi | 4 ++++
fftools/ffmpeg_mux_init.c | 5 +++++
libavcodec/libx265.c | 20 ++++++++++++++++++++
3 files changed, 29 insertions(+)
diff --git a/doc/encoders.texi b/doc/encoders.texi
index e93a3cc275..610ec9a04c 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -3083,6 +3083,10 @@ Quantizer curve compression factor
Normally, when forcing a I-frame type, the encoder can select any type
of I-frame. This option forces it to choose an IDR-frame.
+@item x265-stats
+Specify the file name for 2-pass stats. This is set automatically when using
+the @option{-passlogfile} option.
+
@item udu_sei @var{boolean}
Import user data unregistered SEI if available into output. Default is 0 (off).
diff --git a/fftools/ffmpeg_mux_init.c b/fftools/ffmpeg_mux_init.c
index 194a87875d..0569f62836 100644
--- a/fftools/ffmpeg_mux_init.c
+++ b/fftools/ffmpeg_mux_init.c
@@ -730,6 +730,11 @@ static int new_stream_video(Muxer *mux, const
OptionsContext *o,
AV_OPT_SEARCH_CHILDREN) >
0)
av_opt_set(video_enc, "stats", logfilename,
AV_OPT_SEARCH_CHILDREN);
+ } else if (!strcmp(video_enc->codec->name, "libx265")) {
+ if (av_opt_is_set_to_default_by_name(video_enc, "x265-stats",
+ AV_OPT_SEARCH_CHILDREN) >
0)
+ av_opt_set(video_enc, "x265-stats", logfilename,
+ AV_OPT_SEARCH_CHILDREN);
} else {
if (video_enc->flags & AV_CODEC_FLAG_PASS2) {
char *logbuffer = read_file_to_string(logfilename);
diff --git a/libavcodec/libx265.c b/libavcodec/libx265.c
index 341868e7cd..89cd7d5dbe 100644
--- a/libavcodec/libx265.c
+++ b/libavcodec/libx265.c
@@ -71,6 +71,7 @@ typedef struct libx265Context {
char *preset;
char *tune;
char *profile;
+ char *stats;
AVDictionary *x265_opts;
void *sei_data;
@@ -529,6 +530,24 @@ static av_cold int libx265_encode_init(AVCodecContext
*avctx)
}
}
+ if (avctx->flags & AV_CODEC_FLAG_PASS1) {
+ if (ctx->api->param_parse(ctx->params, "pass", "1") ==
X265_PARAM_BAD_VALUE) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid value for param \"pass\".\n");
+ return AVERROR(EINVAL);
+ }
+ } else if (avctx->flags & AV_CODEC_FLAG_PASS2) {
+ if (ctx->api->param_parse(ctx->params, "pass", "2") ==
X265_PARAM_BAD_VALUE) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid value for param \"pass\".\n");
+ return AVERROR(EINVAL);
+ }
+ }
+ if (ctx->stats) {
+ if (ctx->api->param_parse(ctx->params, "stats", ctx->stats) ==
X265_PARAM_BAD_VALUE) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid value \"%s\" for param
\"stats\".\n", ctx->stats);
+ return AVERROR(EINVAL);
+ }
+ }
+
if (ctx->params->rc.vbvBufferSize && avctx->rc_initial_buffer_occupancy >
1000 &&
ctx->params->rc.vbvBufferInit == 0.9) {
ctx->params->rc.vbvBufferInit =
(float)avctx->rc_initial_buffer_occupancy / 1000;
@@ -1009,6 +1028,7 @@ static const AVOption options[] = {
{ "preset", "set the x265 preset",
OFFSET(preset), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
{ "tune", "set the x265 tune parameter",
OFFSET(tune), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
{ "profile", "set the x265 profile",
OFFSET(profile), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
+ { "x265-stats", "Filename for 2 pass stats",
OFFSET(stats), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
{ "udu_sei", "Use user data unregistered SEI if available",
OFFSET(udu_sei), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1,
VE },
{ "a53cc", "Use A53 Closed Captions (if available)",
OFFSET(a53_cc), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1,
VE },
{ "x265-params", "set the x265 configuration using a :-separated list of
key=value parameters", OFFSET(x265_opts), AV_OPT_TYPE_DICT, { 0 }, 0, 0, VE },
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