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ivfenc: write duration for frame_cnt=1.

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This commit is contained in:
Ronald S. Bultje 2021-03-02 13:52:44 -05:00
parent 82131293b0
commit d29ec02d48
1 changed files with 7 additions and 3 deletions
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10
libavformat/ivfenc.c
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@ -23,7 +23,7 @@
typedef struct IVFEncContext {
unsigned frame_cnt;
uint64_t last_pts, sum_delta_pts;
uint64_t last_pts, sum_delta_pts, last_pkt_duration;
} IVFEncContext;
static int ivf_init(AVFormatContext *s)
@ -86,6 +86,7 @@ static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
avio_write(pb, pkt->data, pkt->size);
if (ctx->frame_cnt)
ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
ctx->last_pkt_duration = pkt->duration;
ctx->frame_cnt++;
ctx->last_pts = pkt->pts;
@ -97,12 +98,15 @@ static int ivf_write_trailer(AVFormatContext *s)
AVIOContext *pb = s->pb;
IVFEncContext *ctx = s->priv_data;
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && ctx->frame_cnt > 1) {
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) &&
(ctx->frame_cnt > 1 || (ctx->frame_cnt == 1 && ctx->last_pkt_duration))) {
int64_t end = avio_tell(pb);
avio_seek(pb, 24, SEEK_SET);
// overwrite the "length" field (duration)
avio_wl32(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
avio_wl32(pb, ctx->last_pkt_duration ?
ctx->sum_delta_pts + ctx->last_pkt_duration :
ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
avio_wl32(pb, 0); // zero out unused bytes
avio_seek(pb, end, SEEK_SET);
}