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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
Autres articles (1)
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Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
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Sur d’autres sites (502)
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Fix freesound link to use freesound.org
5 mars 2012, par Scott Schillerm demo/animation-1/index.html Fix freesound link to use freesound.org
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Blackmagic Deck Link Quad 2 and Multiple Streams with FFmpeg
23 juin 2018, par SpacePirateRobI am trying to accomplish streaming videos from 4 or more feeds on a local display from a DeckLink Quad 2 using
FFmpeg
as my transcoder. I can play two different videos (I only have two sources I can use simultaneously at my desk) fine, but struggle with connecting them into a single video if they are both on the DeckLink. The code I have for a single stream run as a.bat
is below...ffplay -video_size 1280x720 -framerate 60 -pixel_format uyvy422 -f dshow -i video="Decklink Video Capture" \ pause
Reading most forums it would seem that sticking them together with a complex filter should work, as such :
ffmpeg -video_size 1280x720 -pixel_format uyvy422 -framerate 60 -vsync drop -f dshow -rtbufsize 150M -i video="Decklink Video Capture (5)" -i video="Decklink Video Capture" -i video="Decklink Video Capture (5)" -i video="Decklink Video Capture" -an -filter_complex "[0:v][1:v]hstack[t]; [2:v][3:v]hstack[b]; [t][b]vstack" -c:v libx264 -preset ultrafast -f mpegts pipe: | ffplay pipe: -vf scale=1280:720 \ pause
And, with two videos not from the DeckLink (i.e. DeckLink and file), it does work ! But with both coming from the DeckLink I get the following in the console :
Input #0, dshow, from 'video=Decklink Video Capture (5)':0B f=0/0
Duration: N/A, start: 71582788.354257, bitrate: N/A
Stream #0:0: Video: rawvideo (HDYC / 0x43594448), uyvy422(tv), 1280x720, 60 fps, 60 tbr, 10000k tbn, 10000k tbc
video=Decklink Video Capture: No such file or directory
pipe:: Invalid data found when processing inputKB sq= 0B f=0/0And that stream works running on its own too. So my optimistic concern is just that I’m using the wrong naming scheme ; my only other idea is that I can’t read two streams from the DeckLink card simultaneously (though I feel like I’ve read I can). Another concern is introduced here too : one of my streams does not run with frame rate set to 60fps, I need to set it to 59.94fps to work, otherwise it is a black screen.
Would I need to split these into multiple processed to run each stream simultaneously, save them to a temporary file or a pipeline, then combine them in another stream to display ? I am concerned about the latency that program would introduce though. Thank you in advance !
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ffmpeg static link in Visual Studio [duplicate]
24 avril 2019, par iz25This question already has an answer here :
I have build ffmpeg static library on Windows. It seems that everything completed with success. The result of build are following files :
libavcodec.a
libavdevice.a
libavfilter.a
libavformat.a
libavutil.a
libswscale.aI tried to specify above files in Linker->Input in my C++ libray project, but linking fails. Following is build output :
1>libavutil.a(samplefmt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(error.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(avstring.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(bprint.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavformat.a(id3v2.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(opt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(dict.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavutil.a(pixdesc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(ratecontrol.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(qsv.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavformat.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavformat.a(aviobuf.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(ffv1enc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(exif.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_img_wrap
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_version_str
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_version_str
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_build_config
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_build_config
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_err_to_string
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_error
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_error
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_error_detail
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_error_detail
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_destroy
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_destroy
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_control_
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_enc_init_ver
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_enc_config_default
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_encode
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_get_cx_data
1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_vp8_cx
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_dec_init_ver
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_decode
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_get_frame
1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_vp8_dx_algo
1>libavutil.a(opt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
1>libavutil.a(parseutils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
1>libavcodec.a(h264_sei.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
1>libavcodec.a(ratecontrol.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
1>libavcodec.a(qsv.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
1>libavformat.a(id3v2.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___acrt_iob_func
1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___stdio_common_vfprintfWhat could be missing here ?