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ffmpeg: add low_latency encoder param for mediafoundation #72

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Merged
ReenigneArcher merged 1 commit into from
Jan 3, 2023
Merged

ffmpeg: add low_latency encoder param for mediafoundation #72

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1 change: 1 addition & 0 deletions .github/workflows/build-ffmpeg.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,7 @@ jobs:
git apply -v --ignore-whitespace ../../ffmpeg_patches/ffmpeg/01-amf-colorspace-v2.patch
git apply -v --ignore-whitespace ../../ffmpeg_patches/ffmpeg/02-idr-on-amf.patch
git apply -v --ignore-whitespace ../../ffmpeg_patches/ffmpeg/03-amfenc-disable-buffering.patch
git apply -v --ignore-whitespace ../../ffmpeg_patches/ffmpeg/04-mfenc-lowlatency.patch

- name: Setup cross compilation
id: cross
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45 changes: 45 additions & 0 deletions ffmpeg_patches/ffmpeg/04-mfenc-lowlatency.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
From bf116dd598b4c134e26d1d24b6bd65bc86687b75 Mon Sep 17 00:00:00 2001
From: Conn O'Griofa <connogriofa@gmail.com>
Date: Tue, 3 Jan 2023 17:20:17 +0000
Subject: [PATCH] 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).
---
libavcodec/mfenc.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/libavcodec/mfenc.c b/libavcodec/mfenc.c
index bbe78605a9..5f5cc262f7 100644
--- a/libavcodec/mfenc.c
+++ b/libavcodec/mfenc.c
@@ -54,6 +54,7 @@ typedef struct MFContext {
int opt_enc_quality;
int opt_enc_scenario;
int opt_enc_hw;
+ int opt_enc_lowlatency;
} MFContext;

static int mf_choose_output_type(AVCodecContext *avctx);
@@ -704,6 +705,9 @@ 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;
@@ -1278,6 +1282,7 @@ 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}
};

--
2.39.0