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avvidenc: Make sure to pass always increasing PTS to the encoder

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All MPEG1/2/4-based encoders at least are ignoring input frames if
backwards PTS or PTS that are equal to the previous one are passed in.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6505>
This commit is contained in:
Sebastian Dröge 2024-05-01 17:02:38 +03:00 committed by GStreamer Marge Bot
parent 1953bc6122
commit e52f0bbc03
2 changed files with 25 additions and 4 deletions
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28
subprojects/gst-libav/ext/libav/gstavvidenc.c
View file

@ -248,6 +248,7 @@ gst_ffmpegvidenc_set_format (GstVideoEncoder * encoder,
GST_DEBUG_OBJECT (ffmpegenc, "Failed to allocate context");
return FALSE;
}
ffmpegenc->last_pts_ff = G_MININT64;
/* additional avcodec settings */
gst_ffmpeg_cfg_fill_context (G_OBJECT (ffmpegenc), ffmpegenc->context);
@ -550,6 +551,7 @@ gst_ffmpegvidenc_send_frame (GstFFMpegVidEnc * ffmpegenc,
gint res;
GstFlowReturn ret = GST_FLOW_ERROR;
AVFrame *picture = NULL;
GstClockTime pts, pts_running_time;
if (!frame)
goto send_frame;
@ -619,13 +621,21 @@ gst_ffmpegvidenc_send_frame (GstFFMpegVidEnc * ffmpegenc,
picture->width = GST_VIDEO_FRAME_WIDTH (&buffer_info->vframe);
picture->height = GST_VIDEO_FRAME_HEIGHT (&buffer_info->vframe);
// Use the running time to calculate a PTS that is passed to the encoder.
// This ensures that it is increasing even if there are segment changes and
// makes it unnecessary to drain the encoder on every segment change.
pts = frame->pts;
pts_running_time =
gst_segment_to_running_time (&GST_VIDEO_ENCODER
(ffmpegenc)->input_segment, GST_FORMAT_TIME, pts);
if (ffmpegenc->pts_offset == GST_CLOCK_TIME_NONE) {
ffmpegenc->pts_offset = frame->pts;
ffmpegenc->pts_offset = pts_running_time;
}
if (frame->pts == GST_CLOCK_TIME_NONE) {
if (pts_running_time == GST_CLOCK_TIME_NONE) {
picture->pts = AV_NOPTS_VALUE;
} else if (frame->pts < ffmpegenc->pts_offset) {
} else if (pts_running_time < ffmpegenc->pts_offset) {
GST_ERROR_OBJECT (ffmpegenc, "PTS is going backwards");
picture->pts = AV_NOPTS_VALUE;
} else {
@ -639,8 +649,18 @@ gst_ffmpegvidenc_send_frame (GstFFMpegVidEnc * ffmpegenc,
const gint ticks_per_frame = ffmpegenc->context->ticks_per_frame;
#endif
picture->pts =
gst_ffmpeg_time_gst_to_ff ((frame->pts - ffmpegenc->pts_offset) /
gst_ffmpeg_time_gst_to_ff ((pts_running_time - ffmpegenc->pts_offset) /
ticks_per_frame, ffmpegenc->context->time_base);
// Certain codecs require always increasing PTS to work correctly. This
// affects at least all MPEG1/2/4 based encoders.
if (ffmpegenc->last_pts_ff == G_MININT64
|| picture->pts > ffmpegenc->last_pts_ff) {
ffmpegenc->last_pts_ff = picture->pts;
} else {
ffmpegenc->last_pts_ff += 1;
picture->pts = ffmpegenc->last_pts_ff;
}
}
send_frame:

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

@ -41,6 +41,7 @@ struct _GstFFMpegVidEnc
AVCodecContext *context;
AVFrame *picture;
GstClockTime pts_offset;
gint64 last_pts_ff;
gboolean need_reopen;
gboolean discont;
guint pass;