Ronald S. Bultje:
> ---
> libavformat/ivfenc.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/libavformat/ivfenc.c b/libavformat/ivfenc.c
> index 0951f56..e22625b 100644
> --- a/libavformat/ivfenc.c
> +++ b/libavformat/ivfenc.c
> @@ -23,7 +23,7 @@
>
> typedef struct IVFEncContext {
> unsigned frame_cnt;
> - uint64_t last_pts, sum_delta_pts;
> + uint64_t last_pts, sum_delta_pts, first_duration;
> } IVFEncContext;
>
> static int ivf_init(AVFormatContext *s)
> @@ -86,6 +86,8 @@ 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;
> + else
> + ctx->first_duration = pkt->duration;
> ctx->frame_cnt++;
> ctx->last_pts = pkt->pts;
>
> @@ -97,12 +99,15 @@ 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->first_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->frame_cnt > 1 ?
> + ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1)
> :
> + ctx->first_duration);
> avio_wl32(pb, 0); // zero out unused bytes
> avio_seek(pb, end, SEEK_SET);
> }
>
Shouldn't we not always use the duration of the last packet for the
duration and not only when it is the only packet?
- Andreas
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