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FFmpeg and reserved color primaries [closed]
21 janvier, par YozI am trying to get thumbnails from a hevc video downloaded from https://github.com/stashapp/stash/issues/4124#issuecomment-1720057183 and it works with most recent ffmpeg 7.1 (installed via homebrew on mac) printing :


ffmpeg -i input.mp4 -frames:v 1 out.jpg



ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
 built with Apple clang version 16.0.0 (clang-1600.0.26.4)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.1_4 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 59. 39.100 / 59. 39.100
 libavcodec 61. 19.100 / 61. 19.100
 libavformat 61. 7.100 / 61. 7.100
 libavdevice 61. 3.100 / 61. 3.100
 libavfilter 10. 4.100 / 10. 4.100
 libswscale 8. 3.100 / 8. 3.100
 libswresample 5. 3.100 / 5. 3.100
 libpostproc 58. 3.100 / 58. 3.100
[hevc @ 0x134f07530] VPS 0 does not exist
[hevc @ 0x134f07530] SPS 0 does not exist.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 512
 compatible_brands: mp42iso2mp41
 creation_time : 2023-09-14T19:46:05.000000Z
 encoder : HandBrake 1.5.1 2022011000
 Duration: 00:01:26.05, start: 0.000000, bitrate: 231 kb/s
 Stream #0:0[0x1](und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/reserved/bt709), 648x648 [SAR 1:1 DAR 1:1], 188 kb/s, 30 fps, 30 tbr, 90k tbn (default)
 Metadata:
 creation_time : 2023-09-14T19:46:05.000000Z
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 36 kb/s (default)
 Metadata:
 creation_time : 2023-09-14T19:46:05.000000Z
 handler_name : Mono
 vendor_id : [0][0][0][0]
[hevc @ 0x1358065c0] VPS 0 does not exist
[hevc @ 0x1358065c0] SPS 0 does not exist.
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> mjpeg (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'out.jpg':
 Metadata:
 major_brand : mp42
 minor_version : 512
 compatible_brands: mp42iso2mp41
 encoder : Lavf61.7.100
 Stream #0:0(und): Video: mjpeg, yuv420p(pc, bt709/reserved/bt709, progressive), 648x648 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
 Metadata:
 creation_time : 2023-09-14T19:46:05.000000Z
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc61.19.100 mjpeg
 Side data:
 cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
[image2 @ 0x134f16080] The specified filename 'out.jpg' does not contain an image sequence pattern or a pattern is invalid.
[image2 @ 0x134f16080] Use a pattern such as %03d for an image sequence or use the -update option (with -frames:v 1 if needed) to write a single image.
[out#0/image2 @ 0x134f10480] video:5KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 1 fps=0.0 q=5.1 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=4.07x 



however, when I use custom compiled ffmpeg.wasm it fails with :


ffmpeg version N-118050-ga518b5540d Copyright (c) 2000-2024 the FFmpeg developers
 built with emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.73 (ac676d5e437525d15df5fd46bc2c208ec6d376a3)
 configuration: --target-os=none --arch=x86_32 --enable-cross-compile --enable-version3 --enable-zlib --enable-libaom --disable-encoder=libaom_av1 --enable-libopenh264 --enable-libkvazaar --enable-libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libopus --enable-libwebp --enable-libsvtav1 --enable-librubberband --disable-x86asm --disable-inline-asm --disable-stripping --disable-programs --disable-doc --disable-debug --disable-runtime-cpudetect --disable-autodetect --extra-cflags='-O3 -flto -I/ffmpeg-wasm/build/include -pthread -msimd128' --extra-cxxflags='-O3 -flto -I/ffmpeg-wasm/build/include -pthread -msimd128' --extra-ldflags='-O3 -flto -I/ffmpeg-wasm/build/include -pthread -msimd128 -L/ffmpeg-wasm/build/lib' --pkg-config-flags=--static --nm=emnm --ar=emar --ranlib=emranlib --cc=emcc --cxx=em++ --objcc=emcc --dep-cc=emcc --enable-gpl --enable-libx264 --enable-libx265
 libavutil 59. 49.100 / 59. 49.100
 libavcodec 61. 26.100 / 61. 26.100
 libavformat 61. 9.100 / 61. 9.100
 libavdevice 61. 4.100 / 61. 4.100
 libavfilter 10. 6.101 / 10. 6.101
 libswscale 8. 12.100 / 8. 12.100
 libswresample 5. 4.100 / 5. 4.100
 libpostproc 58. 4.100 / 58. 4.100
[hevc @ 0x38d0000] VPS 0 does not exist
[hevc @ 0x38d0000] SPS 0 does not exist.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 512
 compatible_brands: mp42iso2mp41
 creation_time : 2023-09-14T19:46:05.000000Z
 encoder : HandBrake 1.5.1 2022011000
 Duration: 00:01:26.05, start: 0.000000, bitrate: 231 kb/s
 Stream #0:0[0x1](und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/reserved/bt709), 648x648 [SAR 1:1 DAR 1:1], 188 kb/s, 30 fps, 30 tbr, 90k tbn (default)
 Metadata:
 creation_time : 2023-09-14T19:46:05.000000Z
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 36 kb/s (default)
 Metadata:
 creation_time : 2023-09-14T19:46:05.000000Z
 handler_name : Mono
 vendor_id : [0][0][0][0]
[hevc @ 0x38d0300] VPS 0 does not exist
[hevc @ 0x38d0300] SPS 0 does not exist.
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x8ca0000] Unsupported input (Not supported): fmt:yuv420p csp:bt709 prim:reserved trc:bt709 -> fmt:yuv420p csp:bt709 prim:reserved trc:bt709
[vf#0:0 @ 0x3830900] Error while filtering: Not supported
[vf#0:0 @ 0x3830900] Task finished with error code: -138 (Not supported)
[vost#0:0/mjpeg @ 0x385ae40] [enc:mjpeg @ 0x3878b80] Could not open encoder before EOF
[vf#0:0 @ 0x3830900] Terminating thread with return code -138 (Not supported)
[vost#0:0/mjpeg @ 0x385ae40] Task finished with error code: -28 (Invalid argument)
[vost#0:0/mjpeg @ 0x385ae40] Terminating thread with return code -28 (Invalid argument)
[out#0/image2 @ 0x3851580] Nothing was written into output file, because at least one of its streams received no packets.
frame= 0 fps=0.0 q=0.0 Lsize= 0KiB time=N/A bitrate=N/A speed=N/A 
Conversion failed!
Process finished with exit code -138.



I figured out the issue is color primaries
prim:reserved
, and the command can be updated to a working one by re-writing input primaries as following :

ffmpeg -i input.mp4 -vf "colorspace=all=bt709:iprimaries=bt709" -frames:v 1 out.jpg



However, I would like to compile ffmpeg.wasm so that it handles reserved primaries just like the one from homebrew.


Any idea what the compiled ffmpeg.wasm is missing ?