Decoded file having twice the expected size : Using H266 encoder/decoder from Fraunhofer

[remul19]

Hi All,

I am completely new to GitHub. So please excuse, if there is any mistake.

Using Fraunhofer h266 encoder https://github.com/fraunhoferhhi/vvenc , I converted a YUV input (qcif, 176x144, yuv_420) to h266 compressed file. And then using the Fraunhofer decoder https://github.com/fraunhoferhhi/vvdec , I converted this compressed file back to YUV format. The decoded output YUV file is having twice the size of YUV file which was used as the encoder input. Ideally I was expecting that both the YUV files will be having the same size.

The commands used for encoding and decoding is given below.

 vvencapp --preset medium -i input.yuv -s 176x144 -r 24 -o input_compressed.266
 vvdecapp -b input_compressed.266 -o output_decoded.yuv

Size of output_decoded.yuv is twice that of input.yuv. When played on YUV player, the decoded YUV file is not playing as expected. During encoding I tried changing the frame rate, but it did not help. Can someone please guide me to resolve this issue ?

[adamjw24]

The output of the vvencapp is per default a bitstream with 10bit bit-depth, which results in your decoded yuv being in the yuv420p10le, not yuv420p as your input. Use --internal-bitdepth 8 during encoding to keep the output format as yuv420p

[adamjw24]

See also: fraunhoferhhi/vvenc#26

[remul19]

Thank you @adamjw24 ...
Your solution is working good for me.