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Autres articles (97)
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18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
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Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
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Recording Camlink 4k feed with ffmpeg
5 août 2020, par Nitzan Yogevits my first question ! awesome !
so im new to python, and im working on some program for work
I have the Elgato CamLink 4k connected to Sony A7III.
im looking for the best way to record a video file from the camlink feed using python
I know that ffmpeg is a good way to record webcam feed. but im having trouble with it
here is my code.


import ffmpeg

(
 ffmpeg
 .input('0', format='avfoundation', pix_fmt='nv12', framerate=25)
 .output('test.mp4', pix_fmt='nv12', vframes=125)
 .overwrite_output()
 .run()
)



im using this ffmpeg-python module


im getting a output file with only the first frame and nothing more


here is what im getting in the run terminal


ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
 built with Apple clang version 11.0.3 (clang-1103.0.32.62)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --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-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
[avfoundation @ 0x7ff043814600] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, avfoundation, from '0':
 Duration: N/A, start: 6247.240967, bitrate: N/A
 Stream #0:0: Video: rawvideo (NV12 / 0x3231564E), nv12, 3840x2160, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
 Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[mp4 @ 0x7ff043856c00] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
[libx264 @ 0x7ff043868000] MB rate (32400000000) > level limit (16711680)
[libx264 @ 0x7ff043868000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7ff043868000] profile High, level 6.2, 4:2:0, 8-bit
[libx264 @ 0x7ff043868000] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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=18 lookahead_threads=3 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=25 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 'test.mp4':
 Metadata:
 encoder : Lavf58.45.100
 Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), nv12, 3840x2160, q=-1--1, 1000k fps, 1000k tbn, 1000k tbc
 Metadata:
 encoder : Lavc58.91.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 125 fps= 30 q=-1.0 Lsize= 788kB time=00:00:00.00 bitrate=52509528.5kbits/s dup=124 drop=1 speed=2.99e-05x 
video:786kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.290685%
[libx264 @ 0x7ff043868000] frame I:1 Avg QP:19.49 size:588332
[libx264 @ 0x7ff043868000] frame P:31 Avg QP:20.24 size: 4202
[libx264 @ 0x7ff043868000] frame B:93 Avg QP:33.28 size: 922
[libx264 @ 0x7ff043868000] consecutive B-frames: 0.8% 0.0% 0.0% 99.2%
[libx264 @ 0x7ff043868000] mb I I16..4: 2.8% 86.0% 11.3%
[libx264 @ 0x7ff043868000] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 6.9% 0.3% 0.5% 0.0% 0.0% skip:92.3%
[libx264 @ 0x7ff043868000] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 4.4% 0.0% 0.0% direct: 0.0% skip:95.6% L0:19.0% L1:81.0% BI: 0.0%
[libx264 @ 0x7ff043868000] 8x8 transform intra:86.0% inter:88.3%
[libx264 @ 0x7ff043868000] coded y,uvDC,uvAC intra: 93.8% 87.1% 55.6% inter: 0.1% 1.5% 0.0%
[libx264 @ 0x7ff043868000] i16 v,h,dc,p: 9% 10% 9% 72%
[libx264 @ 0x7ff043868000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 14% 34% 6% 5% 5% 6% 7% 7%
[libx264 @ 0x7ff043868000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 18% 16% 9% 8% 7% 8% 7% 6%
[libx264 @ 0x7ff043868000] i8c dc,h,v,p: 48% 26% 20% 6%
[libx264 @ 0x7ff043868000] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7ff043868000] ref P L0: 82.6% 0.1% 14.0% 3.3%
[libx264 @ 0x7ff043868000] ref B L0: 99.8% 0.2% 0.0%
[libx264 @ 0x7ff043868000] ref B L1: 76.2% 23.8%
[libx264 @ 0x7ff043868000] kb/s:51475456.00



if im plugging the camlink off I get a video from my macbook internal camera. so I know this should somehow work


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