I'm used to use ffmpeg with nvidia Gpu devices for video transcoding work. I found issue that when I try to decode a video using h264_cuvid, the number of output frames are more than the number of origin video frames.
I guess, It issue would be caused ffmpeg side. So I tried some tests and Please see below results. [Test environments] 1. Sample Video - 3,600 nb_frame and 1920x1080 60fps video. (A number is increasing video.) - baseline profile and h264 coded video. - Youtube link, but it is not mine. ( https://www.youtube.com/watch?v=jEVewMQ4iu8) 2. Machine Spec - CPU: Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz x40 - Mem: 128GB - GPU: Tesla P4 x2, NVIDIA-SMI 396.26, nvcc V9.2.88 (Release) 3. Use ffmpeg version 3.4 [Test] 1. Video decoding using h264_cuvid on FFmpeg - using `ffmpeg -c:v h264_cuvid -i baseline-numbered.mp4 -f rawvideo -pix_fmt nv12 ./output.ffmpeg.nv12` - 4 frames were duplicated. (11209881600 bytes output, 3604 frames) - Snapshot: https://drive.google.com/open?id=1sfpjtOMMhLkXD72abHyLNY0FdOVS1xl9 2. Video decoding using AppDec Sample code in Nvidia Video SDK. - using the source code of "{VIDEO_SDK_BASE}/Samples/AppDecode/AppDec" - 0 frames were duplicated. (11197440000 bytes output, 3600 frames) - Snapshot: https://drive.google.com/file/d/1Ww9P0Vhd2K76xsyRKkPHf1Yis3-HuMN-/view?usp=sharing As I knew that FFmpeg h264_cuvid module was used same code of Nvidia Video SDK code. So I thought ffmpeg seems occur creating duplicated frame or something wrong. So I wonder this happening is caused by ffmpeg or not. In order words, For getting the same result on ffmpeg, would I ask you this issue validation by anyone who can help me out? Thank you. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
