There are 2 types of problems when using adaptive deinterlace with cuvid: 1. Sometimes, in the middle of transcoding, cuvid outputs frames with visible horizontal lines (as though weave deinterlace method was chosen); 2. Occasionally, on scene changes, cuvid outputs a wrong frame, which should have been shown several seconds before (as if the frame was assigned some wrong PTS value).
The reason is that sometimes CUVIDPARSERDISPINFO has property progressive_frame equal to 1 with interlaced videos. In order to fix the problem we should check if the video is interlaced or progressive in the beginning of a video sequence (cuvid_handle_video_sequence). And then we just use this information instead of the property progressive_frame in CUVIDPARSERDISPINFO (which is unreliable). More info, samples and reproduction steps are here https://github.com/Svechnikov/ffmpeg-cuda-deinterlace-problems --- libavcodec/cuviddec.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavcodec/cuviddec.c b/libavcodec/cuviddec.c index 2aecb45..671fc8c 100644 --- a/libavcodec/cuviddec.c +++ b/libavcodec/cuviddec.c @@ -77,6 +77,7 @@ typedef struct CuvidContext int deint_mode; int deint_mode_current; int64_t prev_pts; + unsigned char progressive_sequence; int internal_error; int decoder_flushing; @@ -216,6 +217,8 @@ static int CUDAAPI cuvid_handle_video_sequence(void *opaque, CUVIDEOFORMAT* form ? cudaVideoDeinterlaceMode_Weave : ctx->deint_mode; + ctx->progressive_sequence = format->progressive_sequence; + if (!format->progressive_sequence && ctx->deint_mode_current == cudaVideoDeinterlaceMode_Weave) avctx->flags |= AV_CODEC_FLAG_INTERLACED_DCT; else @@ -509,6 +512,8 @@ static int cuvid_output_frame(AVCodecContext *avctx, AVFrame *frame) av_fifo_generic_read(ctx->frame_queue, &parsed_frame, sizeof(CuvidParsedFrame), NULL); + parsed_frame.dispinfo.progressive_frame = ctx->progressive_sequence; + memset(¶ms, 0, sizeof(params)); params.progressive_frame = parsed_frame.dispinfo.progressive_frame; params.second_field = parsed_frame.second_field; -- 2.7.4 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
