[Libav-user] decoding_encoding.c with HEVC

[Peter Steinbach]

Hi to all,

I've recently started experimenting with ffmpeg to use it in order to 
encode 3D objects (for a scientific purpose rather than stereoscopic 
vision before anyone asks). Based on my missing knowledge in video 
encoding/decoding, I used the ffmpeg example  and modified it 
decoding_encoding.c so that I can create a 3D 8bit object and then 
encode it with HEVC and re-read it back to produce *.pgm files.

However the decoding step produces just 2 images, which is clearly not 
what I was expecting given than I encoded 25 frames. I am also getting 
error messages like
[hevc @ 0xe58760] Invalid NAL unit 0, skipping.
During the decoding. Does anyone have an idea what I did wrong?


I upload the source code here:
https://gist.github.com/psteinb/bf12348d799108f390f5

Running ffprobe on the produced *.h265 file yields:
ffprobe version 2.5.8 Copyright (c) 2007-2015 the FFmpeg developers
   built on Aug 11 2015 08:55:10 with gcc 4.9.2 (GCC) 20150212 (Red Hat 
4.9.2-6)
   configuration: --prefix=/home/steinbac/software/ffmpeg/2.5.8 
--enable-libx265 --enable-libx264 --enable-gpl --enable-shared
   libavutil      54. 15.100 / 54. 15.100
   libavcodec     56. 13.100 / 56. 13.100
   libavformat    56. 15.102 / 56. 15.102
   libavdevice    56.  3.100 / 56.  3.100
   libavfilter     5.  2.103 /  5.  2.103
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  3.100 / 53.  3.100
Input #0, hevc, from 'ffmpeg_roundtrip.h265':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: hevc (Main), yuv420p(tv), 352x288, 25 fps, 25 
tbr, 1200k tbn, 25 tbc

Any help would be appreciated!
Best,
Peter