ffmpegを使用してビデオ変換またはデスクトップ録画を実行しようとすると、この警告メッセージが黄色で表示されます：unknown side data type 10 (24 bytes)。gitリポジトリ（gitバージョン）からコンパイルされたArch Linux x86_64でのffmpegの使用。
単純なビデオ変換の出力：
$ ffmpeg -i video1.avi video2.mp4
ffmpeg version N-77722-g3ec5d8f Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.3.0 (GCC)
configuration: --prefix=/opt/ffmpeg-full-git --extra-cflags='-I/usr/include/nvidia-sdk -I/opt/x265-hg/include' --extra-ldflags='-L/opt/x265-hg/lib -Wl,-rpath -Wl,/opt/x265-hg/lib' --cpu=native --enable-rpath --enable-gpl --enable-version3 --enable-nonfree --enable-gray --disable-static --enable-shared --disable-htmlpages --disable-podpages --disable-txtpages --enable-avresample --enable-videotoolbox --enable-avisynth --enable-chromaprint --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gmp --enable-gnutls --enable-ladspa --enable-libaacplus --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcelt --enable-libcdio --enable-libdc1394 --enable-libdcadec --enable-libfaac --enable-libfdk-aac --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libiec61883 --enable-libilbc --enable-libkvazaar --enable-libmodplug --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencv --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-libquvi --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libutvideo --enable-libv4l2 --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-decklink --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-openssl --enable-x11grab
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 22.100 / 57. 22.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, avi, from 'video1.avi':
Metadata:
encoder : Lavf52.31.0
Duration: 00:04:09.40, start: 0.000000, bitrate: 633 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 892x668 [SAR 1:1 DAR 223:167], 497 kb/s, 5 fps, 5 tbr, 5 tbn, 5 tbc
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s
[libx264 @ 0x27e77e0] using SAR=1/1
[libx264 @ 0x27e77e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x27e77e0] profile High, level 3.1
[libx264 @ 0x27e77e0] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'video2.mp4':
Metadata:
encoder : Lavf57.21.101
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 892x668 [SAR 1:1 DAR 223:167], q=-1--1, 5 fps, 10240 tbn, 5 tbc
Metadata:
encoder : Lavc57.22.100 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc57.22.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (mp3 (native) -> aac (native))
Press [q] to stop, [?] for help
frame= 1247 fps=139 q=-1.0 Lsize= 5433kB time=00:04:09.24 bitrate= 178.6kbits/s dup=2 drop=0 speed=27.8x
video:1464kB audio:3891kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.446609%
[libx264 @ 0x27e77e0] frame I:6 Avg QP: 9.37 size: 89238
[libx264 @ 0x27e77e0] frame P:338 Avg QP:16.29 size: 2085
[libx264 @ 0x27e77e0] frame B:903 Avg QP:20.75 size: 286
[libx264 @ 0x27e77e0] consecutive B-frames: 3.3% 0.0% 1.4% 95.3%
[libx264 @ 0x27e77e0] mb I I16..4: 56.4% 4.2% 39.4%
[libx264 @ 0x27e77e0] mb P I16..4: 1.1% 0.3% 0.4% P16..4: 3.1% 0.4% 0.4% 0.0% 0.0% skip:94.4%
[libx264 @ 0x27e77e0] mb B I16..4: 0.4% 0.2% 0.0% B16..8: 2.9% 0.1% 0.0% direct: 0.0% skip:96.4% L0:56.6% L1:43.1% BI: 0.3%
[libx264 @ 0x27e77e0] 8x8 transform intra:17.0% inter:56.4%
[libx264 @ 0x27e77e0] coded y,uvDC,uvAC intra: 17.8% 25.8% 20.4% inter: 0.3% 0.7% 0.4%
[libx264 @ 0x27e77e0] i16 v,h,dc,p: 38% 60% 2% 0%
[libx264 @ 0x27e77e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 7% 22% 69% 1% 0% 0% 0% 0% 1%
[libx264 @ 0x27e77e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 27% 18% 4% 5% 3% 3% 2% 4%
[libx264 @ 0x27e77e0] i8c dc,h,v,p: 46% 39% 14% 1%
[libx264 @ 0x27e77e0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x27e77e0] ref P L0: 67.1% 4.6% 17.9% 10.4%
[libx264 @ 0x27e77e0] ref B L0: 64.2% 32.5% 3.2%
[libx264 @ 0x27e77e0] ref B L1: 93.0% 7.0%
[libx264 @ 0x27e77e0] kb/s:48.07
[aac @ 0x27e8700] Qavg: 633.592
より完全なコマンドでも、同じ警告が引き続き表示されます。たとえば、デスクトップを記録しようとする場合：
$ ffmpeg -f pulse -thread_queue_size 512 -ac 2 -channel_layout stereo -i default -f x11grab -thread_queue_size 512 -r 60 -s 1280x720 -i :0.0+224,235 -acodec pcm_s16le -vcodec libx264 -r 60 -preset ultrafast -qp 0 -pix_fmt yuv444p -threads 0 screencast.mkv
ffmpeg version N-77722-g3ec5d8f Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.3.0 (GCC)
configuration: --prefix=/opt/ffmpeg-full-git --extra-cflags='-I/usr/include/nvidia-sdk -I/opt/x265-hg/include' --extra-ldflags='-L/opt/x265-hg/lib -Wl,-rpath -Wl,/opt/x265-hg/lib' --cpu=native --enable-rpath --enable-gpl --enable-version3 --enable-nonfree --enable-gray --disable-static --enable-shared --disable-htmlpages --disable-podpages --disable-txtpages --enable-avresample --enable-videotoolbox --enable-avisynth --enable-chromaprint --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gmp --enable-gnutls --enable-ladspa --enable-libaacplus --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcelt --enable-libcdio --enable-libdc1394 --enable-libdcadec --enable-libfaac --enable-libfdk-aac --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libiec61883 --enable-libilbc --enable-libkvazaar --enable-libmodplug --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencv --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-libquvi --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libutvideo --enable-libv4l2 --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-decklink --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-openssl --enable-x11grab
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 22.100 / 57. 22.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, pulse, from 'default':
Duration: N/A, start: 1452122996.525850, bitrate: 1536 kb/s
Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Input #1, x11grab, from ':0.0+224,235':
Duration: N/A, start: 1452122997.816378, bitrate: N/A
Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1280x720, 60 fps, 60 tbr, 1000k tbn, 60 tbc
[libx264 @ 0x283ed40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x283ed40] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
[libx264 @ 0x283ed40] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, matroska, to 'screencast.mkv':
Metadata:
encoder : Lavf57.21.101
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1280x720, q=-1--1, 60 fps, 1k tbn, 60 tbc
Metadata:
encoder : Lavc57.22.100 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
Metadata:
encoder : Lavc57.22.100 pcm_s16le
Stream mapping:
Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Stream #0:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
frame= 748 fps= 56 q=-1.0 Lsize= 10237kB time=00:00:12.58 bitrate=6662.7kbits/s speed=0.948x
video:7871kB audio:2360kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.063400%
[libx264 @ 0x283ed40] frame I:3 Avg QP: 0.00 size:304901
[libx264 @ 0x283ed40] frame P:745 Avg QP: 0.00 size: 9590
[libx264 @ 0x283ed40] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x283ed40] mb P I16..4: 46.1% 0.0% 0.0% P16..4: 1.0% 0.0% 0.0% 0.0% 0.0% skip:52.8%
[libx264 @ 0x283ed40] coded y,u,v intra: 1.1% 0.2% 0.2% inter: 1.8% 0.3% 0.3%
[libx264 @ 0x283ed40] i16 v,h,dc,p: 99% 1% 0% 0%
[libx264 @ 0x283ed40] kb/s:5171.57
VP9ビデオコーデックの使用時にも表示されるため、特定のH.264警告ではないようです。
この警告は何を意味し、それを修正するために何をする必要がありますか？ありがとう。