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x264enc: Shift both PTS and DTS to ensure positive timestamp

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Currently we only shift DTS to compensate that we don't support negative
timestamp. This cause a problem that PTS is no longer >= DTS and may
make muxers live much harder. Instead, shift both PTS/DTS forward. Also
remove all the hack to handle this which seems the result of thinking libx264
is bugged.

https://bugzilla.gnome.org/show_bug.cgi?id=731351
This commit is contained in:
Nicolas Dufresne 2014-06-06 20:23:15 -04:00
parent caee6eb21d
commit 698714fc97
2 changed files with 10 additions and 18 deletions
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26
ext/x264/gstx264enc.c
View file

@ -1470,7 +1470,7 @@ gst_x264_enc_init_encoder (GstX264Enc * encoder)
encoder->reconfig = FALSE;
/* good start, will be corrected if needed */
encoder->dts_offset = 0;
encoder->ts_offset = 0;
GST_OBJECT_UNLOCK (encoder);
@ -1964,7 +1964,6 @@ gst_x264_enc_handle_frame (GstVideoEncoder * video_enc,
pic_in.i_type = X264_TYPE_AUTO;
pic_in.i_pts = frame->pts;
pic_in.i_dts = frame->dts;
pic_in.opaque = GINT_TO_POINTER (frame->system_frame_number);
ret = gst_x264_enc_encode_frame (encoder, &pic_in, frame, &i_nal, TRUE);
@ -2070,23 +2069,16 @@ gst_x264_enc_encode_frame (GstX264Enc * encoder, x264_picture_t * pic_in,
/* we want to know if x264 is messing around with this */
g_assert (frame->pts == pic_out.i_pts);
if (pic_out.b_keyframe) {
/* expect dts == pts, and also positive ts,
* so arrange for an offset if needed */
if (pic_out.i_dts + encoder->dts_offset != pic_out.i_pts) {
encoder->dts_offset = pic_out.i_pts - pic_out.i_dts;
GST_DEBUG_OBJECT (encoder, "determined dts offset %" G_GINT64_FORMAT,
encoder->dts_offset);
}
}
if (pic_out.i_dts + (gint64) encoder->dts_offset < 0) {
/* should be ok now, surprise if not */
GST_WARNING_OBJECT (encoder, "negative dts after offset compensation");
frame->dts = GST_CLOCK_TIME_NONE;
} else
frame->dts = pic_out.i_dts + encoder->dts_offset;
/* As upstream often starts with PTS set to zero, in presence of b-frames,
* x264 will have to use negative DTS. As this is not supported by
* GStreamer, we shift both DTS and PTS forward to make it positive. It's
* important to shift both in order to ensure PTS remains >= to DTS. */
if (pic_out.i_dts < encoder->ts_offset)
encoder->ts_offset = pic_out.i_dts;
frame->dts = pic_out.i_dts - encoder->ts_offset;
frame->pts = pic_out.i_pts - encoder->ts_offset;
if (pic_out.b_keyframe) {
GST_DEBUG_OBJECT (encoder, "Output keyframe");

2
ext/x264/gstx264enc.h
View file

@ -51,7 +51,7 @@ struct _GstX264Enc
x264_t *x264enc;
x264_param_t x264param;
gint current_byte_stream;
GstClockTime dts_offset;
gint64 ts_offset;
/* List of frame/buffer mapping structs for
* pending frames */