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new 1356714d11 avcodec/nvenc: force frameIntervalP=1 for H.264 Baseline
profile
1356714d11 is described below
commit 1356714d11b2885edfe7cdc26cb7cb256ea2c485
Author: Diego de Souza <[email protected]>
AuthorDate: Mon May 18 16:05:06 2026 +0200
Commit: Timo Rothenpieler <[email protected]>
CommitDate: Mon May 18 18:38:06 2026 +0000
avcodec/nvenc: force frameIntervalP=1 for H.264 Baseline profile
H.264 Baseline profile cannot contain B-frames, but the NVENC preset
defaults and the max_b_frames-derived frameIntervalP override leave
frameIntervalP > 1 when -profile:v baseline is requested. The
unconditional check at the end of nvenc_setup_encoder() then sets
has_b_frames = 2, which propagates to the muxer and causes
compute_muxer_pkt_fields() to back-calculate
DTS = PTS - (delay + 1) * frame_duration. The resulting bitstream
contains no B-frames, yet every packet has a spurious 3-frame PTS/DTS
gap, breaking MPEG-TS/HLS output and DTS-based players.
This patch forces frameIntervalP to 1 in the Baseline branch of
nvenc_setup_h264_config() and warn if the user (or preset) had asked
for B-frames. The later has_b_frames assignment then sees the corrected
value and leaves avctx->has_b_frames at 0.
Fixes #22727.
Signed-off-by: Diego de Souza <[email protected]>
---
libavcodec/nvenc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index a8dac1ebd3..7b9f7260df 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -1358,6 +1358,11 @@ static av_cold int
nvenc_setup_h264_config(AVCodecContext *avctx)
case NV_ENC_H264_PROFILE_BASELINE:
cc->profileGUID = NV_ENC_H264_PROFILE_BASELINE_GUID;
avctx->profile = AV_PROFILE_H264_BASELINE;
+ if (cc->frameIntervalP > 1) {
+ av_log(avctx, AV_LOG_WARNING,
+ "B-frames are not supported by H.264 Baseline profile,
disabling.\n");
+ cc->frameIntervalP = 1;
+ }
break;
case NV_ENC_H264_PROFILE_MAIN:
cc->profileGUID = NV_ENC_H264_PROFILE_MAIN_GUID;
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