Convert 8K H264 to VP9

[hugo53]

Hi @tianjunwork,

I created the issue #142 about 8K AV1 to VP9 conversion. Please correct me if I'm wrong to create this new issue to discuss about 8K H264 to VP9 conversion.

I tried to convert 8K H264 to VP9 using libsvt_vp9 but got Segmentation fault error , below is full gdb backtrace:

$ gdb ./ffmpeg
(gdb) run  -i h264-8k-10sec.mp4 -c:v libsvt_vp9 test10.webm

Thread 173 "ffmpeg" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffda4c46700 (LWP 6188)]
0x00007ffff7041790 in eb_vp9_output_bitstream_reset () from /usr/local/lib/libSvtVp9Enc.so.1
(gdb) bt
#0  0x00007ffff7041790 in eb_vp9_output_bitstream_reset () from /usr/local/lib/libSvtVp9Enc.so.1
#1  0x00007ffff70643e9 in eb_vp9_reset_bitstream () from /usr/local/lib/libSvtVp9Enc.so.1
#2  0x00007ffff708f5a2 in eb_vp9_packetization_kernel () from /usr/local/lib/libSvtVp9Enc.so.1
#3  0x00007ffff6e236db in start_thread (arg=0x7ffda4c46700) at pthread_create.c:463
#4  0x00007ffff6b4c71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

I understand that originally SVT-VP9 only supports 4Kp60 video. Could you tell me if there is any plan to support 8K video? Can we have 8K quality for both input and output videos?

Thanks in advance!