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avvidenc: Offset PTS to zero to fix bitrate control

Browse source 
Otherwise ffmpeg's rate control algorithm will not work correctly as
it is based on the absolute PTS values.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-libav/-/issues/91

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3727>
This commit is contained in:
Sebastian Dröge 2023-01-13 12:43:30 +02:00 committed by GStreamer Marge Bot
parent af97e98315
commit 2c503a8d7d
2 changed files with 30 additions and 8 deletions
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37
subprojects/gst-libav/ext/libav/gstavvidenc.c
View file

@ -398,6 +398,7 @@ gst_ffmpegvidenc_set_format (GstVideoEncoder * encoder,
}
/* success! */
ffmpegenc->pts_offset = GST_CLOCK_TIME_NONE;
ffmpegenc->opened = TRUE;
return TRUE;
@ -617,9 +618,20 @@ gst_ffmpegvidenc_send_frame (GstFFMpegVidEnc * ffmpegenc,
picture->width = GST_VIDEO_FRAME_WIDTH (&buffer_info->vframe);
picture->height = GST_VIDEO_FRAME_HEIGHT (&buffer_info->vframe);
picture->pts =
gst_ffmpeg_time_gst_to_ff (frame->pts /
ffmpegenc->context->ticks_per_frame, ffmpegenc->context->time_base);
if (ffmpegenc->pts_offset == GST_CLOCK_TIME_NONE) {
ffmpegenc->pts_offset = frame->pts;
}
if (frame->pts == GST_CLOCK_TIME_NONE) {
picture->pts = AV_NOPTS_VALUE;
} else if (frame->pts < ffmpegenc->pts_offset) {
GST_ERROR_OBJECT (ffmpegenc, "PTS is going backwards");
picture->pts = AV_NOPTS_VALUE;
} else {
picture->pts =
gst_ffmpeg_time_gst_to_ff ((frame->pts - ffmpegenc->pts_offset) /
ffmpegenc->context->ticks_per_frame, ffmpegenc->context->time_base);
}
send_frame:
if (!picture) {
@ -701,14 +713,20 @@ gst_ffmpegvidenc_receive_packet (GstFFMpegVidEnc * ffmpegenc,
GST_VIDEO_CODEC_FRAME_UNSET_SYNC_POINT (frame);
}
frame->dts =
gst_ffmpeg_time_ff_to_gst (pkt->dts, ffmpegenc->context->time_base);
if (pkt->dts != AV_NOPTS_VALUE) {
frame->dts =
gst_ffmpeg_time_ff_to_gst (pkt->dts + ffmpegenc->pts_offset,
ffmpegenc->context->time_base);
}
/* This will lose some precision compared to setting the PTS from the input
* buffer directly, but that way we're sure PTS and DTS are consistent, in
* particular DTS should always be <= PTS
*/
frame->pts =
gst_ffmpeg_time_ff_to_gst (pkt->pts, ffmpegenc->context->time_base);
if (pkt->pts != AV_NOPTS_VALUE) {
frame->pts =
gst_ffmpeg_time_ff_to_gst (pkt->pts + ffmpegenc->pts_offset,
ffmpegenc->context->time_base);
}
ret = gst_video_encoder_finish_frame (GST_VIDEO_ENCODER (ffmpegenc), frame);
@ -802,6 +820,7 @@ gst_ffmpegvidenc_flush_buffers (GstFFMpegVidEnc * ffmpegenc, gboolean send)
break;
} while (got_packet);
avcodec_flush_buffers (ffmpegenc->context);
ffmpegenc->pts_offset = GST_CLOCK_TIME_NONE;
done:
/* FFMpeg will return AVERROR_EOF if it's internal was fully drained
@ -877,8 +896,10 @@ gst_ffmpegvidenc_flush (GstVideoEncoder * encoder)
{
GstFFMpegVidEnc *ffmpegenc = (GstFFMpegVidEnc *) encoder;
if (ffmpegenc->opened)
if (ffmpegenc->opened) {
avcodec_flush_buffers (ffmpegenc->context);
ffmpegenc->pts_offset = GST_CLOCK_TIME_NONE;
}
return TRUE;
}

1
subprojects/gst-libav/ext/libav/gstavvidenc.h
View file

@ -40,6 +40,7 @@ struct _GstFFMpegVidEnc
AVCodecContext *context;
AVFrame *picture;
GstClockTime pts_offset;
gboolean opened;
gboolean need_reopen;
gboolean discont;