Control: tags -1 moreinfo On 2026-10-15 18:06:34 +0200, Santiago Vila wrote: > Package: src:ffmpeg > Version: 7:9.0.2-3 > Severity: important > Control: affects -1 src:libmedia-convert-perl > > Dear maintainer: > > I can't build libmedia-convert-perl on a system with 1 CPU because one of > the tests segfaults. However, the program crashing is ffmpeg. > > How to reproduce: On a VM with 1 CPU, or booting with > GRUB_CMDLINE_LINUX="nr_cpus=1": > > apt-get source libmedia-convert-perl > cd libmedia-convert-perl-1.6.1 > ffmpeg -loglevel warning -y -i t/testvids/bbb.mp4 -dn -threads 1 -c:v > libsvtav1 -r:v 24/1 -crf 25 -speed 4 -preset 4 -c:a libvorbis -b:a 133431 -ar > 44100 -t 1 -pix_fmt yuv420p -svtav1-params tune=0:film-grain=8 ./1sec.webm > > Output: > > Svt[info]: ------------------------------------------- > Svt[info]: SVT [version]: SVT-AV1 Encoder Lib v4.2.0 > Svt[info]: SVT [build] : GCC 16.2.0 64 bit > Svt[info]: ------------------------------------------- > Svt[info]: Level of Parallelism: 1 > Svt[info]: Number of PPCS 74 > Svt[info]: [asm level on system : up to avx512icl] > Svt[info]: [asm level selected : up to avx512icl] > Svt[info]: ------------------------------------------- > Svt[info]: SVT [config]: main profile tier (auto) level (auto) > Svt[info]: SVT [config]: width / height / fps numerator / fps denominator > : 856 / 480 / 24 / 1 > Svt[info]: SVT [config]: bit-depth / color format > : 8 / YUV420 > Svt[info]: SVT [config]: preset / tune / pred struct > : 4 / VQ / random access > Svt[info]: SVT [config]: gop size / mini-gop size / key-frame type > : 161 / 32 / key frame > Svt[info]: SVT [config]: BRC mode / rate factor > : CRF / 25.00 > Svt[info]: SVT [config]: AQ mode / Variance Boost > : 2 / 0 > Svt[info]: SVT [config]: film grain synth / denoising / level / adaptive > blocksize : 1 / 0 / 8 / True > Svt[info]: SVT [config]: sharpness / luminance-based QP bias > : 0 / 0 > Svt[info]: SVT [config]: QP scale compress strength > : 0 > Svt[info]: ------------------------------------------- > Segmentation fault
I'd appreciate a backtrace from gdb since I cannot reproduce it on a system with more than one CPU. Cheers > > For the upstream authors: Instead of downloading the source for > libmedia-convert-perl, the input > file bbb.mp4 can be downloaded from this URL, which is where the package is > hosted in salsa: > > https://salsa.debian.org/wouter/media-convert/-/blob/main/t/testvids/bbb.mp4?ref_type=heads > > Thanks. > -- Sebastian Ramacher
