Add frames_before and frames_after as hints that there will be frames before
or after the frames produced in this session. This may help with
concatenation issues like bit rate spikes.
Signed-off-by: Rick Kern <ker...@gmail.com>
---
libavcodec/videotoolboxenc.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index a30a3ca..c630825 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -77,6 +77,8 @@ typedef struct VTEncContext {
int64_t level;
int64_t entropy;
int64_t realtime;
+ int64_t frames_before;
+ int64_t frames_after;
#if !TARGET_OS_IPHONE
int64_t allow_sw;
@@ -742,6 +744,30 @@ static av_cold int vtenc_init(AVCodecContext *avctx)
}
}
+ if (vtctx->frames_before == 1) {
+ status = VTSessionSetProperty(vtctx->session,
+
kVTCompressionPropertyKey_MoreFramesBeforeStart,
+ kCFBooleanTrue);
+
+ if (status == kVTPropertyNotSupportedErr) {
+ av_log(avctx, AV_LOG_WARNING, "frames_before property is not
supported on this device. Ignoring.\n");
+ } else if (status) {
+ av_log(avctx, AV_LOG_ERROR, "Error setting frames_before property:
%d\n", status);
+ }
+ }
+
+ if (vtctx->frames_after == 1) {
+ status = VTSessionSetProperty(vtctx->session,
+
kVTCompressionPropertyKey_MoreFramesAfterEnd,
+ kCFBooleanTrue);
+
+ if (status == kVTPropertyNotSupportedErr) {
+ av_log(avctx, AV_LOG_WARNING, "frames_after property is not
supported on this device. Ignoring.\n");
+ } else if (status) {
+ av_log(avctx, AV_LOG_ERROR, "Error setting frames_after property:
%d\n", status);
+ }
+ }
+
if (!vtctx->has_b_frames) {
status = VTSessionSetProperty(vtctx->session,
kVTCompressionPropertyKey_AllowFrameReordering,
@@ -1553,6 +1579,10 @@ static const AVOption options[] = {
{ "realtime", "Hint that encoding should happen in real-time if not faster
(e.g. capturing from camera).",
OFFSET(realtime), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VE },
+ { "frames_before", "Other frames will come before the frames in this
session. This helps smooth concatenation issues.",
+ OFFSET(frames_before), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VE },
+ { "frames_after", "Other frames will come after the frames in this
session. This helps smooth concatenation issues.",
+ OFFSET(frames_after), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VE },
{ NULL },
};
--
2.7.4
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