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Somos millones 1
21 juillet 2014, par
Mis à jour : Juin 2015
Langue : français
Type : Video
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Why JPEG image looks different in two videos ?
28 septembre 2015, par user606521I have two frames :
f1.jpg
f2.jpg
And I am creating two videos :
./ffmpeg -i ./f%d.jpg -r 30 -y m1.mp4 # both frames 1 and 2
./ffmpeg -i ./f2.jpg -r 30 -y m2.mp4 # only frame 2For some reason frame 2 looks different in these two videos
Frame 2 from m1.mp4 :
$ ./ffmpeg -i m1.mp4 out1_%d.jpg
ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 41.100 / 56. 41.100
libavformat 56. 36.100 / 56. 36.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'm1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.36.100
Duration: 00:00:00.07, start: 0.000000, bitrate: 478 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 980x100, 381 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
[swscaler @ 0x7f7f9a000600] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'out1_%d.jpg':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.36.100
Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 980x100, q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc56.41.100 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
frame= 2 fps=0.0 q=1.6 Lsize=N/A time=00:00:00.06 bitrate=N/A
video:6kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Frame 2 from m2.mp4 :
$ ./ffmpeg -i m2.mp4 out2_%d.jpg
ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 41.100 / 56. 41.100
libavformat 56. 36.100 / 56. 36.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'm2.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.36.100
Duration: 00:00:00.03, start: 0.000000, bitrate: 824 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 980x100 [SAR 1:1 DAR 49:5], 648 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Output #0, image2, to 'out2_%d.jpg':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.36.100
Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 980x100 [SAR 1:1 DAR 49:5], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc56.41.100 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=1.6 Lsize=N/A time=00:00:00.03 bitrate=N/A
video:4kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
It seems that frame 2 looks different when combined with frame 1 in a video. One thing I noticed that when dumping frames from m1.mp4 (two frames combined) there is a warning in ffmpeg output :
[swscaler @ 0x7f7f9a000600] deprecated pixel format used, make sure you did set range correctlyAlso two frame images have same dimmensions (980x100) and their format seems to be same :
$ file -b f1.jpg
JPEG image data, JFIF standard 1.01, comment: "CS=ITU601??"
$ file -b f2.jpg
JPEG image data, JFIF standard 1.01So why this is happening ? I am struggling with this issue for quite a long time - for some reason some JPEGs somehow are in different "format ?" than others and make mess in videos...
You can download first two images included in this question and test commands on your own.
$ identify -verbose f1.jpg
Image: f1.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Mime type: image/jpeg
Class: DirectClass
Geometry: 980x100+0+0
Resolution: 552x551
Print size: 1.77536x0.181488
Units: PixelsPerInch
Type: Palette
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Red:
min: 189 (0.741176)
max: 233 (0.913725)
mean: 208.261 (0.81671)
standard deviation: 14.1741 (0.0555848)
kurtosis: -1.40078
skewness: 0.332664
Green:
min: 189 (0.741176)
max: 233 (0.913725)
mean: 208.261 (0.81671)
standard deviation: 14.1741 (0.0555848)
kurtosis: -1.40078
skewness: 0.332664
Blue:
min: 189 (0.741176)
max: 233 (0.913725)
mean: 208.26 (0.816706)
standard deviation: 14.1756 (0.0555905)
kurtosis: -1.40068
skewness: 0.332424
Image statistics:
Overall:
min: 189 (0.741176)
max: 233 (0.913725)
mean: 208.261 (0.816709)
standard deviation: 14.1746 (0.0555867)
kurtosis: -1.40075
skewness: 0.332584
Colors: 47
Histogram:
368: (189,189,189) #BDBDBD grey74
1984: (190,190,190) #BEBEBE grey
28: (191,191,189) #BFBFBD srgb(191,191,189)
3780: (191,191,191) #BFBFBF grey75
28: (192,192,190) #C0C0BE srgb(192,192,190)
6628: (192,192,192) #C0C0C0 silver
5664: (193,193,193) #C1C1C1 srgb(193,193,193)
4608: (194,194,194) #C2C2C2 grey76
4480: (195,195,195) #C3C3C3 srgb(195,195,195)
3328: (196,196,196) #C4C4C4 grey77
2592: (197,197,197) #C5C5C5 srgb(197,197,197)
3072: (198,198,198) #C6C6C6 srgb(198,198,198)
2272: (199,199,199) #C7C7C7 grey78
2112: (200,200,200) #C8C8C8 srgb(200,200,200)
2112: (201,201,201) #C9C9C9 grey79
1920: (202,202,202) #CACACA srgb(202,202,202)
1728: (203,203,203) #CBCBCB srgb(203,203,203)
1760: (204,204,204) #CCCCCC grey80
1696: (205,205,205) #CDCDCD srgb(205,205,205)
1248: (206,206,206) #CECECE srgb(206,206,206)
1536: (207,207,207) #CFCFCF grey81
1504: (208,208,208) #D0D0D0 srgb(208,208,208)
1344: (209,209,209) #D1D1D1 grey82
1536: (210,210,210) #D2D2D2 srgb(210,210,210)
1472: (211,211,211) #D3D3D3 LightGray
1088: (212,212,212) #D4D4D4 grey83
1472: (213,213,213) #D5D5D5 srgb(213,213,213)
1536: (214,214,214) #D6D6D6 grey84
1344: (215,215,215) #D7D7D7 srgb(215,215,215)
1184: (216,216,216) #D8D8D8 srgb(216,216,216)
1408: (217,217,217) #D9D9D9 grey85
1472: (218,218,218) #DADADA srgb(218,218,218)
1216: (219,219,219) #DBDBDB grey86
1280: (220,220,220) #DCDCDC gainsboro
1536: (221,221,221) #DDDDDD srgb(221,221,221)
1472: (222,222,222) #DEDEDE grey87
1600: (223,223,223) #DFDFDF srgb(223,223,223)
1696: (224,224,224) #E0E0E0 grey88
1792: (225,225,225) #E1E1E1 srgb(225,225,225)
1728: (226,226,226) #E2E2E2 srgb(226,226,226)
1952: (227,227,227) #E3E3E3 grey89
2272: (228,228,228) #E4E4E4 srgb(228,228,228)
2752: (229,229,229) #E5E5E5 grey90
4512: (230,230,230) #E6E6E6 srgb(230,230,230)
4672: (231,231,231) #E7E7E7 srgb(231,231,231)
640: (232,232,232) #E8E8E8 grey91
576: (233,233,233) #E9E9E9 srgb(233,233,233)
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 980x100+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Orientation: Undefined
Properties:
comment: CS=ITU601
date:create: 2015-09-28T21:47:26+02:00
date:modify: 2015-09-28T21:47:26+02:00
jpeg:colorspace: 2
jpeg:quality: 92
jpeg:sampling-factor: 2x2,1x1,1x1
signature: ca599d8ad07c79b36837cb9f4811d83e236b8d4a4cdfada8d60c4aa330f28f38
Artifacts:
filename: f1.jpg
verbose: true
Tainted: False
Filesize: 1.36KB
Number pixels: 98K
Pixels per second: 9.8MB
User time: 0.000u
Elapsed time: 0:01.009
Version: ImageMagick 6.8.7-0 2013-10-28 Q16 http://www.imagemagick.org$ identify -verbose f2.jpg
Image: f2.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Mime type: image/jpeg
Class: DirectClass
Geometry: 980x100+0+0
Resolution: 72x72
Print size: 13.6111x1.38889
Units: PixelsPerInch
Type: Palette
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Red:
min: 186 (0.729412)
max: 254 (0.996078)
mean: 242.844 (0.952329)
standard deviation: 11.0845 (0.0434688)
kurtosis: 4.24417
skewness: -2.17102
Green:
min: 186 (0.729412)
max: 254 (0.996078)
mean: 242.844 (0.952329)
standard deviation: 11.0845 (0.0434688)
kurtosis: 4.24417
skewness: -2.17102
Blue:
min: 186 (0.729412)
max: 254 (0.996078)
mean: 242.842 (0.952323)
standard deviation: 11.0886 (0.0434848)
kurtosis: 4.24235
skewness: -2.17103
Image statistics:
Overall:
min: 186 (0.729412)
max: 254 (0.996078)
mean: 242.843 (0.952327)
standard deviation: 11.0859 (0.0434741)
kurtosis: 4.24356
skewness: -2.17102
Colors: 91
Histogram:
2: (186,186,186) #BABABA grey73
2: (187,187,187) #BBBBBB srgb(187,187,187)
1: (189,189,189) #BDBDBD grey74
5: (190,190,190) #BEBEBE grey
2: (191,191,191) #BFBFBF grey75
20: (192,192,192) #C0C0C0 silver
28: (193,193,193) #C1C1C1 srgb(193,193,193)
37: (194,194,194) #C2C2C2 grey76
46: (195,195,195) #C3C3C3 srgb(195,195,195)
59: (196,196,196) #C4C4C4 grey77
108: (197,197,197) #C5C5C5 srgb(197,197,197)
134: (198,198,198) #C6C6C6 srgb(198,198,198)
145: (199,199,199) #C7C7C7 grey78
188: (200,200,200) #C8C8C8 srgb(200,200,200)
230: (201,201,201) #C9C9C9 grey79
241: (202,202,202) #CACACA srgb(202,202,202)
236: (203,203,203) #CBCBCB srgb(203,203,203)
252: (204,204,204) #CCCCCC grey80
240: (205,205,205) #CDCDCD srgb(205,205,205)
243: (206,206,206) #CECECE srgb(206,206,206)
1: (207,207,205) #CFCFCD srgb(207,207,205)
250: (207,207,207) #CFCFCF grey81
1: (208,208,206) #D0D0CE srgb(208,208,206)
267: (208,208,208) #D0D0D0 srgb(208,208,208)
2: (209,209,207) #D1D1CF srgb(209,209,207)
226: (209,209,209) #D1D1D1 grey82
3: (210,210,208) #D2D2D0 srgb(210,210,208)
193: (210,210,210) #D2D2D2 srgb(210,210,210)
5: (211,211,209) #D3D3D1 srgb(211,211,209)
215: (211,211,211) #D3D3D3 LightGray
7: (212,212,210) #D4D4D2 srgb(212,212,210)
227: (212,212,212) #D4D4D4 grey83
11: (213,213,211) #D5D5D3 srgb(213,213,211)
250: (213,213,213) #D5D5D5 srgb(213,213,213)
4: (214,214,212) #D6D6D4 srgb(214,214,212)
291: (214,214,214) #D6D6D6 grey84
16: (215,215,213) #D7D7D5 srgb(215,215,213)
307: (215,215,215) #D7D7D7 srgb(215,215,215)
1: (216,216,214) #D8D8D6 srgb(216,216,214)
371: (216,216,216) #D8D8D8 srgb(216,216,216)
4: (217,217,215) #D9D9D7 srgb(217,217,215)
355: (217,217,217) #D9D9D9 grey85
3: (218,218,216) #DADAD8 srgb(218,218,216)
398: (218,218,218) #DADADA srgb(218,218,218)
3: (219,219,217) #DBDBD9 srgb(219,219,217)
404: (219,219,219) #DBDBDB grey86
5: (220,220,218) #DCDCDA srgb(220,220,218)
435: (220,220,220) #DCDCDC gainsboro
1: (221,221,219) #DDDDDB srgb(221,221,219)
489: (221,221,221) #DDDDDD srgb(221,221,221)
2: (222,222,220) #DEDEDC srgb(222,222,220)
569: (222,222,222) #DEDEDE grey87
1: (223,223,221) #DFDFDD srgb(223,223,221)
552: (223,223,223) #DFDFDF srgb(223,223,223)
2: (224,224,222) #E0E0DE srgb(224,224,222)
595: (224,224,224) #E0E0E0 grey88
2: (225,225,223) #E1E1DF srgb(225,225,223)
645: (225,225,225) #E1E1E1 srgb(225,225,225)
736: (226,226,226) #E2E2E2 srgb(226,226,226)
3: (227,227,225) #E3E3E1 srgb(227,227,225)
646: (227,227,227) #E3E3E3 grey89
1: (228,228,226) #E4E4E2 srgb(228,228,226)
707: (228,228,228) #E4E4E4 srgb(228,228,228)
1: (229,229,227) #E5E5E3 srgb(229,229,227)
667: (229,229,229) #E5E5E5 grey90
1: (230,230,228) #E6E6E4 srgb(230,230,228)
759: (230,230,230) #E6E6E6 srgb(230,230,230)
767: (231,231,231) #E7E7E7 srgb(231,231,231)
788: (232,232,232) #E8E8E8 grey91
862: (233,233,233) #E9E9E9 srgb(233,233,233)
880: (234,234,234) #EAEAEA srgb(234,234,234)
889: (235,235,235) #EBEBEB grey92
863: (236,236,236) #ECECEC srgb(236,236,236)
868: (237,237,237) #EDEDED grey93
1032: (238,238,238) #EEEEEE srgb(238,238,238)
878: (239,239,239) #EFEFEF srgb(239,239,239)
1083: (240,240,240) #F0F0F0 grey94
1035: (241,241,241) #F1F1F1 srgb(241,241,241)
1247: (242,242,242) #F2F2F2 grey95
1610: (243,243,243) #F3F3F3 srgb(243,243,243)
2084: (244,244,244) #F4F4F4 srgb(244,244,244)
3473: (245,245,245) #F5F5F5 grey96
6350: (246,246,246) #F6F6F6 srgb(246,246,246)
9152: (247,247,247) #F7F7F7 grey97
14755: (248,248,248) #F8F8F8 srgb(248,248,248)
21183: (249,249,249) #F9F9F9 srgb(249,249,249)
12507: (250,250,250) #FAFAFA grey98
2516: (251,251,251) #FBFBFB srgb(251,251,251)
305: (252,252,252) #FCFCFC grey99
16: (253,253,253) #FDFDFD srgb(253,253,253)
4: (254,254,254) #FEFEFE srgb(254,254,254)
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 980x100+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Orientation: Undefined
Properties:
date:create: 2015-09-28T21:48:30+02:00
date:modify: 2015-09-28T21:48:30+02:00
jpeg:colorspace: 2
jpeg:quality: 92
jpeg:sampling-factor: 2x2,1x1,1x1
signature: f718ab157fae4ff0395eaf07a0165897fd9de558eaed00586530690d39e5ed23
Artifacts:
filename: f2.jpg
verbose: true
Tainted: False
Filesize: 4.32KB
Number pixels: 98K
Pixels per second: 0B
User time: 0.000u
Elapsed time: 0:01.000
Version: ImageMagick 6.8.7-0 2013-10-28 Q16 http://www.imagemagick.org -
Desktop streaming to Wowza server using ffmpeg
24 avril 2013, par Gergely LukacsyRecently, I'm trying to utilize ffmpeg for streaming live desktop screen to a Wowza media server.
I have partial success on the subject so far :
I've managed to record desktop screen using the UScreenCapture directx dshow filter, and I'm also able to send this record to the server.
However, when I'm trying to send the screen directly to the server, it fails every time. The player is buffering pretty slowly, and shows a blank screen when it's done (the counter keeps counting).So, here are the working methods
for recording screen :
ffmpeg -f dshow -i video="UScreenCapture" -r 25 -vcodec libx264 output.flvand for streaming video :
ffmpeg -re -i -map 0 -c copy -vbsf h264_mp4toannexb -f mpegts udp://stream.server.xyz:52000?pkt_size=1024And this is the code I'm using :
ffmpeg -f dshow -i video="UScreenCapture" -s width x height -r framerate -vcodec libx264 -pix_fmt yuv420p -b:v bitrate -an -vbsf h264_mp4toannexb -f mpegts udp ://your.destination.url:PORTNUMBER ?pkt_size=some_bytes
As far as I can remember, it worked well before I upgraded wowza.
Some additional info :
- OS : win7 sp1 64bit
- ffmpeg N-49610-gc2dd5a1 (Zeranoe FFmpeg build 2013 Feb 5)
- UScreenCapture : x64 Edition Version 2.0.14
- Wowza 3.5.2 running on a Debian linux 2.6.32-5-amd64
- Flowplayer : 3.2.15
Looking trough the Wowza log files, something caught my attention. It seems when I'm streaming desktop screen, the server somhow gets uncomplete packets, but when I'm streaming a video file, the error doesn't occurs.
RTPDePacketizerMPEGTS.handleRTPPacket
WARN server comment 2013-04-11 11:26:24 - - - - - 152629.665 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:26:27 - - - - - 152632.782 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:26:31 - - - - - 152636.383 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:26:38 - - - - - 152643.484 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:26:47 - - - - - 152653.088 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:26:52 - - - - - 152657.587 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:26:56 - - - - - 152661.624 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472
WARN server comment 2013-04-11 11:27:05 - - - - - 152670.805 - - - - - - - -RTPDePacketizerMPEGTS.handleRTPPacket: Incomplete packet: 1504:1472What causes this error ? Any ideas ?
Thanks in advance !
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FFmpeg error message when processing
19 avril 2013, par FlyingCatHi I am using
FFmpegto get the image from several video files.I got my
ffmpegcodes ready but I got the following error when Iexecmy codes.ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Apr 2 2013 17:02:36 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
//files info...
//files info...
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
//file info...
[buffer @ 0x1513c40] Buffering several frames is not supported. Please consume all available frames before adding a new one.
Last message repeated 75 times
[image2 @ 0x1513460] Could not open file : /test/project
av_interleaved_write_frame(): Input/output errorI only show the error messages that have color highlighted.
My codes
$ffmpeg ="/usr/bin/ffmpeg";
$image_source_path = '/test/project/test.mp4';
$ALL_PLACE_WIDTH = 300;
$ALL_PLACE_HEIGHT = 300;
$image_cmd = " -r 1 -ss 00:00:10 -t 00:00:01 -s ".$ALL_PLACE_WIDTH."x".$ALL_PLACE_HEIGHT." -f image2 " ;
$dest_image_path = '/test/project';
$str_command= $ffmpeg ." -i " . $image_source_path . $image_cmd .$dest_image_path;
shell_exec($str_command);It seems my linux want to me switch avconv. I am not sure how to fix these errors. Can someone give me a hint about it ? Thanks so much !
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