[FFmpeg-devel] [PATCH 2/3] decklink: Fix setting of last_pts to only be set for video

Devin Heitmueller devin.heitmueller at ltnglobal.com
Fri Feb 24 00:25:12 EET 2023

The ff_decklink_write_packet() was always caching the last pts
received, to be used when calling StopScheduledPlayback().  However
because audio and video are on different timebases and the call to
StopScheduledPlayback() expects the video timebase, we'll end up
sending a weird value to the stop routine if the last packet
received contained audio.

Move the setting of last_pts to just be for the video stream.

Signed-off-by: Devin Heitmueller <dheitmueller at ltnglobal.com>
 libavdevice/decklink_enc.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavdevice/decklink_enc.cpp b/libavdevice/decklink_enc.cpp
index c3dc2c0cac..f7daf37654 100644
--- a/libavdevice/decklink_enc.cpp
+++ b/libavdevice/decklink_enc.cpp
@@ -441,6 +441,8 @@ static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt)
     uint32_t buffered;
     HRESULT hr;
+    ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);
     if (st->codecpar->codec_id == AV_CODEC_ID_WRAPPED_AVFRAME) {
         if (tmp->format != AV_PIX_FMT_UYVY422 ||
             tmp->width  != ctx->bmd_width ||
@@ -628,8 +630,6 @@ int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt)
     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;
     AVStream *st = avctx->streams[pkt->stream_index];
-    ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);
     if      (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
         return decklink_write_video_packet(avctx, pkt);
     else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)

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