Revert "CI Linux FFmpeg: remove NVENC IDR patch"

This reverts commit e457ab8 but the
patch is updated to match current FFmpeg.

The FFmpeg commit that seemed to do the same (7eeef72c6) is not working
correctly because it assigns idrPeriod cc->gopLength, which was set to
NVENC_INFINITE_GOPLENGTH above in case of intra-refresh.

refer to GH-330

Author: MartinPulec

.github/scripts/Linux/ffmpeg-patches/0001-NVENC_INFINITE_GOPLENGTH-is-useless-for-UltraGrid-up.patch

@@ -0,0 +1,53 @@
+From 2bd65325dc20ad1ea3111e8a8b8328224fd9ee0a Mon Sep 17 00:00:00 2001
+From: Martin Pulec <martin.pulec@cesnet.cz>
+Date: Mon, 24 Jul 2023 16:15:29 +0200
+Subject: [PATCH] NVENC_INFINITE_GOPLENGTH is useless for UltraGrid (updated)
+
+---
+ libavcodec/avcodec.h | 3 +++
+ libavcodec/nvenc.c   | 3 ---
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
+index fe41ecc3c9..15bc1f5cec 100644
+--- a/libavcodec/avcodec.h
++++ b/libavcodec/avcodec.h
+@@ -3270,4 +3270,7 @@ int avcodec_is_open(AVCodecContext *s);
+  * @}
+  */
+ 
++// UltraGrid patch
++#define PATCHED_FF_NVENC_NO_INFINITE_GOP 1
++
+ #endif /* AVCODEC_AVCODEC_H */
+diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
+index 0b6417674e..70adc26f08 100644
+--- a/libavcodec/nvenc.c
++++ b/libavcodec/nvenc.c
+@@ -1173,7 +1173,6 @@ static av_cold int nvenc_setup_h264_config(AVCodecContext *avctx)
+         h264->enableIntraRefresh = 1;
+         h264->intraRefreshPeriod = cc->gopLength;
+         h264->intraRefreshCnt = cc->gopLength - 1;
+-        cc->gopLength = NVENC_INFINITE_GOPLENGTH;
+ #ifdef NVENC_HAVE_SINGLE_SLICE_INTRA_REFRESH
+         h264->singleSliceIntraRefresh = ctx->single_slice_intra_refresh;
+ #endif
+@@ -1294,7 +1293,6 @@ static av_cold int nvenc_setup_hevc_config(AVCodecContext *avctx)
+         hevc->enableIntraRefresh = 1;
+         hevc->intraRefreshPeriod = cc->gopLength;
+         hevc->intraRefreshCnt = cc->gopLength - 1;
+-        cc->gopLength = NVENC_INFINITE_GOPLENGTH;
+ #ifdef NVENC_HAVE_SINGLE_SLICE_INTRA_REFRESH
+         hevc->singleSliceIntraRefresh = ctx->single_slice_intra_refresh;
+ #endif
+@@ -1409,7 +1407,6 @@ static av_cold int nvenc_setup_av1_config(AVCodecContext *avctx)
+         av1->enableIntraRefresh = 1;
+         av1->intraRefreshPeriod = cc->gopLength;
+         av1->intraRefreshCnt = cc->gopLength - 1;
+-        cc->gopLength = NVENC_INFINITE_GOPLENGTH;
+     }
+ 
+     av1->idrPeriod = cc->gopLength;
+-- 
+2.41.0
+

src/video_compress/libavcodec.cpp

@@ -1539,19 +1539,16 @@ static void configure_nvenc(AVCodecContext *codec_ctx, struct setparam_param *pa
         }
 
         set_forced_idr(codec_ctx, 1);
-#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(60, 22, 100)
-        const bool new_ff = true;
+#ifdef PATCHED_FF_NVENC_NO_INFINITE_GOP
+        const bool patched_ff = true;
 #else
-        const bool new_ff = false;
+        const bool patched_ff = false;
         if (param->periodic_intra != 0) {
-                LOG(LOG_LEVEL_WARNING) << MOD_NAME
-                    "Old FFmpeg, " << (param->periodic_intra != 1 ? "not " : "")
-                                       << "enabling Intra Refresh.\n";
+                LOG(LOG_LEVEL_WARNING) << MOD_NAME "FFmpeg not patched, " << (param->periodic_intra != 1 ? "not " : "") << "enabling Intra Refresh.\n";
         }
 #endif
 
-        if ((new_ff && param->periodic_intra != 0) ||
-            param->periodic_intra == 1) {
+        if ((patched_ff && param->periodic_intra != 0) || param->periodic_intra == 1) {
                 check_av_opt_set<int>(codec_ctx->priv_data, "intra-refresh", 1);
         }