[FFmpeg-devel] [PATCH] avcodec/mfenc: add low_latency encoder parameter (PR #20384)

[FFmpeg-devel] [PATCH] avcodec/mfenc: add low_latency encoder parameter (PR #20384)

[cgutman via ffmpeg-devel]

PR #20384 opened by cgutman
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20384
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20384.patch

Implement support for CODECAPI_AVLowLatencyMode property, which is
useful for live streaming use cases (and cannot be achieved by
selecting any of the low latency "scenario" encoder presets alone).

Co-authored-by: Conn O'Griofa <connogriofa@gmail.com>
Signed-off-by: Cameron Gutman <aicommander@gmail.com>


>From d8cc14fb53294280ae76222fcbf7db816ade8be7 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Sat, 2 Aug 2025 23:55:25 -0500
Subject: [PATCH] avcodec/mfenc: add low_latency encoder parameter

Implement support for CODECAPI_AVLowLatencyMode property, which is
useful for live streaming use cases (and cannot be achieved by
selecting any of the low latency "scenario" encoder presets alone).

Co-authored-by: Conn O'Griofa <connogriofa@gmail.com>
Signed-off-by: Cameron Gutman <aicommander@gmail.com>
---
 libavcodec/mfenc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/mfenc.c b/libavcodec/mfenc.c
index 942c75cb9d..eacf8110bc 100644
--- a/libavcodec/mfenc.c
+++ b/libavcodec/mfenc.c
@@ -64,6 +64,7 @@ typedef struct MFContext {
     int opt_enc_quality;
     int opt_enc_scenario;
     int opt_enc_hw;
+    int opt_enc_lowlatency;
     AVD3D11VADeviceContext* device_hwctx;
 } MFContext;
 
@@ -876,6 +877,9 @@ static int mf_encv_output_adjust(AVCodecContext *avctx, IMFMediaType *type)
 
         if (c->opt_enc_scenario >= 0)
             ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVScenarioInfo, FF_VAL_VT_UI4(c->opt_enc_scenario));
+
+        if (c->opt_enc_lowlatency)
+            ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVLowLatencyMode, FF_VAL_VT_UI4(1));
     }
 
     return 0;
@@ -1455,6 +1459,7 @@ static const AVOption venc_opts[] = {
 
     {"quality",       "Quality", OFFSET(opt_enc_quality), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 100, VE},
     {"hw_encoding",   "Force hardware encoding", OFFSET(opt_enc_hw), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, VE},
+    {"low_latency",   "Low latency mode", OFFSET(opt_enc_lowlatency), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, VE},
     {NULL}
 };
 
-- 
2.49.1

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