ok Sorry it says "re.iso: UDF filesystem data (version 1.5) 'CDROM'".
OK here is a copy of the output. I was evidently doing something wrong there with the ampersand,
ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12 (GCC)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -Wl,--build-id=sha1 -Wl,-dT,/builddir/build/BUILD/ffmpeg-5.0.1/.package_note-ffmpeg-5.0.1-11.fc36.x86_64.ld' --disable-htmlpages --enable-pic --disable-stripping --enable-shared --disable-static --enable-gpl --enable-version3 --enable-libsmbclient --disable-openssl --enable-b
zlib --enable-frei0r --enable-chromaprint --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libshaderc --enable-vulkan --disable-cuda-sdk --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libdc1394 --enable-libdrm --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libilbc --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopenh264-dlopen --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsvtav1 --enable-libsoxr --enable-libspeex --enable-libssh --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi -
-enable-lto --enable-libmfx --enable-vaapi --enable-vdpau --enable-openal --enable-opencl --enable-opengl --enable-pthreads --enable-vapoursynth --enable-muxers --enable-demuxers --enable-hwaccels --disable-encoders --disable-decoders --disable-decoder='mpeg4,h263,h264,hevc,vc1' --enable-encoder=',libfdk_aac,ac3,apng,ass,ayuv,bmp,ffv1,ffvhuff,flac,gif,h263_v4l2m2m,h264_amf,h264_nvenc,h264_qsv,h264_v4l2m2m,h264_vaapi,hevc_amf,hevc_nvenc,hevc_qsv,hevc_v4l2m2m,hevc_vaapi,huffyuv,ilbc,jpegls,jpeg2000,libaom,libaom_av1,libcodec2,libgsm,libilbc,libmp3lame,libopenh264,libopenjpeg,libopus,librav1e,libschroedinger,libspeex,libsvtav1,libtheora,libtwolame,libvorbis,libvpx_vp8,libvpx_vp9,libwebp,libwebp_anim,mjpeg,mjpeg_qsv,mjpeg_vaapi,mp2,mp2fixed,mpeg1video,mpeg2video,mpeg2_qsv,mpeg2_vaapi,mpeg4_v4l2m2m,opus,pam,pbm,pcm_alaw,pcm_f32be,pcm_f32le,pcm_f64be,pcm_f64le,pcm_mulaw,pcm_s16be,pcm_s16be_planar,pcm_s16le,pcm_s16le_planar,pcm_s24be,pcm_s24le,pcm_s24le_planar,pcm_s32be,pcm_s32le,pcm_s32le
_planar,pcm_s8,pcm_s8_planar,pcm_u16be,pcm_u16le,pcm_u24be,pcm_u24le,pcm_u32be,pcm_u32le,pcm_u8,pcx,pgm,pgmyuv,png,ppm,rawvideo,sgi,srt,ssa,sunrast,targa,text,tiff,v210,v308,v408,v410,vc1_qsv,vc1_v4l2m2m,vorbis,vp8_qsv,vp8_v4l2m2m,vp8_vaapi,vp9_qsv,vp9_vaapi,webvtt,wrapped_avframe,xbm,xwd,y41p,yuv4,zlib,' --enable-decoder=',libfdk_aac,ac3,ansi,apng,ass,av1_qsv,ayuv,bmp,dirac,exr,ffv1,ffvhuff,ffwavesynth,flac,gif,gsm,huffyuv,ilbc,jpeg2000,libaom,libaom_av1,libcodec2,libdav1d,libgsm,libilbc,libopenh264,libopenjpeg,libopus,libschroedinger,libspeex,libvorbis,libvpx_vp8,libvpx_vp9,mjpeg,mjpeg_qsv,mp1,mp1float,mp2,mp2float,mp3,mp3float,mpeg1video,mpeg1_v4l2m2m,mpeg2video,mpeg2_qsv,mpeg2_v4l2m2m,opus,pam,pbm,pcm_alaw,pcm_bluray,pcm_dvd,pcm_f32be,pcm_f32le,pcm_f64be,pcm_f64le,pcm_mulaw,pcm_s16be,pcm_s16be_planar,pcm_s16le,pcm_s16le_planar,pcm_s24be,pcm_s24le,pcm_s24le_planar,pcm_s32be,pcm_s32le,pcm_s32le_planar,pcm_s8,pcm_s8_planar,pcm_u16be,pcm_u16le,pcm_u24be,pcm_u24le,pcm_u32be,pcm_u32le
,pcm_u8,pcx,pgm,pgmyuv,pgssub,pgx,png,ppm,rawvideo,sgi,srt,ssa,sunrast,targa,text,theora,tiff,v210,v210x,v308,v408,v410,vorbis,vp3,vp5,vp6,vp6a,vp6f,vp8,vp8_qsv,vp8_v4l2m2m,vp9,vp9_qsv,vp9_v4l2m2m,webp,webvtt,wrapped_avframe,xbm,xwd,y41p,yuv4,zlib,'
libavutil 57. 17.100 / 57. 17.100
libavcodec 59. 18.100 / 59. 18.100
libavformat 59. 16.100 / 59. 16.100
libavdevice 59. 4.100 / 59. 4.100
libavfilter 8. 24.100 / 8. 24.100
libswscale 6. 4.100 / 6. 4.100
libswresample 4. 3.100 / 4. 3.100
libpostproc 56. 3.100 / 56. 3.100
[mpeg @ 0x5602c25b3240] stream 4 : no PTS found at end of file, duration not set
[mpeg @ 0x5602c25b3240] stream 5 : no TS found at start of file, duration not set
[mpeg @ 0x5602c25b3240] Could not find codec parameters for stream 5 (Audio: mp2, 0 channels): unspecified frame size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mpeg, from 're.iso':
Duration: 00:00:00.50, start: 0.280633, bitrate: 105501764 kb/s
Stream #0:0[0x1bf]: Data: dvd_nav_packet
Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, progressive), 720x480 [SAR 32:27 DAR 16:9], 8000 kb/s, 29.97 fps, 29.97 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 5000000/0/0 buffer size: 1835008 vbv_delay: N/A
Stream #0:2[0x20]: Subtitle: dvd_subtitle
Stream #0:3[0x21]: Subtitle: dvd_subtitle
Stream #0:4[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:5[0x1d7]: Audio: mp2, 0 channels
Stream mapping:
Stream #0:1 -> #0:0 (mpeg2video (native) -> mpeg4 (mpeg4_v4l2m2m))
Stream #0:4 -> #0:1 (ac3 (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[mpeg4_v4l2m2m @ 0x5602c25bb740] Could not find a valid device
[mpeg4_v4l2m2m @ 0x5602c25bb740] can't configure encoder
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!
lot of text
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