From: Alexis Ballier <[email protected]> When the encoder is fed with less frames than its delay, the picture list looks like { NULL, NULL, ..., frame, frame, frame }. When flushing the encoder (input frame == NULL), we need to ensure the picture list is shifted enough so that we do not return an empty packet, which would mean the encoder has finished, while it has not encoded any frame.
Signed-off-by: Vittorio Giovara <[email protected]> --- libavcodec/mpegvideo_enc.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c index 9dd30e6..b00a798 100644 --- a/libavcodec/mpegvideo_enc.c +++ b/libavcodec/mpegvideo_enc.c @@ -962,9 +962,10 @@ static int load_input_picture(MpegEncContext *s, const AVFrame *pic_arg) Picture *pic = NULL; int64_t pts; int i, display_picture_number = 0, ret; - const int encoding_delay = s->max_b_frames ? s->max_b_frames : - (s->low_delay ? 0 : 1); + int encoding_delay = s->max_b_frames ? s->max_b_frames : + (s->low_delay ? 0 : 1); int direct = 1; + int shift = 1; if (pic_arg) { pts = pic_arg->pts; @@ -1075,11 +1076,18 @@ static int load_input_picture(MpegEncContext *s, const AVFrame *pic_arg) pic->f->display_picture_number = display_picture_number; pic->f->pts = pts; // we set this here to avoid modifiying pic_arg + } else { + /* Flushing: When we have not received enough input frames, + * ensure s->input_picture[0] contains the first picture */ + for (shift = 0; shift < encoding_delay + 1; shift++) + if (s->input_picture[shift]) break; + if (shift <= 1) shift = 1; + else encoding_delay = encoding_delay - shift + 1; } /* shift buffer entries */ - for (i = 1; i < MAX_PICTURE_COUNT /*s->encoding_delay + 1*/; i++) - s->input_picture[i - 1] = s->input_picture[i]; + for (i = shift; i < MAX_PICTURE_COUNT /*s->encoding_delay + 1*/; i++) + s->input_picture[i - shift] = s->input_picture[i]; s->input_picture[encoding_delay] = (Picture*) pic; -- 1.9.5 (Apple Git-50.3) _______________________________________________ libav-devel mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-devel
