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  • FFMPEG output (Images > Video) is unplayable

    23 décembre 2014, par jgads

    I’m using FFMPEG to make a video slideshow from a group of images on Android. The process completes successfully and the output file is the correct/expected size (or the same as what is reported in FFMPEG’s ’progress’), but the video does not play on any Android video player (MXplayer, VLC, stock). The video players show a perpetual loading circle and never actually launch. MXplayer can see the file and generate a thumbnail but not actually play it. Here is the command :

    ffmpeg -f image2 -re -r 1 -i
    /storage/emulated/0/Pictures/phototest/%d.jpg -vcodec libx264 -f mp4
    -r 24 -preset : ultrafast -an -threads 4 -b 4000k -mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -g 300 -y -pix_fmt yuv420p /storage/emulated/0/Pictures/phototest/result1.mp4

    Here’s the output via Android Logcat :

    12-23 12:59:49.890  12665-12665/com.company.example I/FFmpeg﹕ Loading FFmpeg for armv7-neon CPU
    
12-23 12:59:50.210  12665-12665/com.company.example E/FFMPEG﹕ Success loading ffmpeg
    
12-23 12:59:54.420  12665-12665/com.company.example E/FFMPEG﹕ Started.
    
12-23 12:59:54.445  12665-12799/com.company.example D/FFmpeg﹕ Running publishing updates method
    
12-23 12:59:54.465  12665-12665/com.company.example E/FFMPEG﹕ Progress: ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
    
12-23 12:59:54.465  12665-12665/com.company.example E/FFMPEG﹕ Progress:   built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
    
12-23 12:59:54.465  12665-12665/com.company.example E/FFMPEG﹕ Progress:   configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    
12-23 12:59:54.465  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libavutil      54.  7.100 / 54.  7.100
    
12-23 12:59:54.465  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libavcodec     56.  1.100 / 56.  1.100
    
12-23 12:59:54.470  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libavformat    56.  4.101 / 56.  4.101
    
12-23 12:59:54.470  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libavdevice    56.  0.100 / 56.  0.100
    
12-23 12:59:54.470  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libavfilter     5.  1.100 /  5.  1.100
    
12-23 12:59:54.470  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libswscale      3.  0.100 /  3.  0.100
    
12-23 12:59:54.470  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libswresample   1.  1.100 /  1.  1.100
    
12-23 12:59:54.470  12665-12665/com.company.example E/FFMPEG﹕ Progress:   libpostproc    53.  0.100 / 53.  0.100
    
12-23 12:59:54.655  12665-12665/com.company.example E/FFMPEG﹕ Progress: Input #0, image2, from '/storage/emulated/0/Pictures/phototest/%d.jpg':
    
12-23 12:59:54.655  12665-12665/com.company.example E/FFMPEG﹕ Progress:   Duration: 00:00:28.00, start: 0.000000, bitrate: N/A
    
12-23 12:59:54.655  12665-12665/com.company.example E/FFMPEG﹕ Progress:     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg), 2528x1856 [SAR 1:1 DAR 79:58], 1 fps, 1 tbr, 1 tbn, 1 tbc
    
12-23 12:59:54.655  12665-12665/com.company.example E/FFMPEG﹕ Progress: Please use -b:a or -b:v, -b is ambiguous
    
12-23 12:59:54.665  12665-12665/com.company.example E/FFMPEG﹕ Progress: [swscaler @ 0x2b3f7990] deprecated pixel format used, make sure you did set range correctly
    
12-23 12:59:54.670  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] using SAR=1/1
    
12-23 12:59:54.685  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] using cpu capabilities: none!
    
12-23 12:59:54.755  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] profile Constrained Baseline, level 5.0
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=2 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=300 keyint_min=24 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=4000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress: Output #0, mp4, to '/storage/emulated/0/Pictures/phototest/result1.mp4':
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress:   Metadata:
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress:     encoder         : Lavf56.4.101
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress:     Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 2528x1856 [SAR 1:1 DAR 79:58], q=-1--1, 4000 kb/s, 24 fps, 12288 tbn, 24 tbc
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress:     Metadata:
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress:       encoder         : Lavc56.1.100 libx264
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress: Stream mapping:
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress:   Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
    
12-23 12:59:54.760  12665-12665/com.company.example E/FFMPEG﹕ Progress: Press [q] to stop, [?] for help
    
12-23 13:00:03.905  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=   49 fps= 11 q=17.0 size=     840kB time=00:00:01.83 bitrate=3752.6kbits/s dup=46 drop=0
    
12-23 13:00:11.185  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=   73 fps=8.0 q=17.0 size=    1397kB time=00:00:02.83 bitrate=4039.0kbits/s dup=69 drop=0
    
12-23 13:00:17.615  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=   97 fps=5.9 q=17.0 size=    1931kB time=00:00:03.83 bitrate=4126.8kbits/s dup=92 drop=0
    
12-23 13:00:22.545  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  121 fps=5.3 q=17.0 size=    2496kB time=00:00:04.83 bitrate=4229.6kbits/s dup=115 drop=0
    
12-23 13:00:27.630  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  145 fps=5.2 q=17.0 size=    3089kB time=00:00:05.83 bitrate=4338.5kbits/s dup=138 drop=0
    
12-23 13:00:33.005  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  169 fps=5.1 q=17.0 size=    3702kB time=00:00:06.83 bitrate=4437.9kbits/s dup=161 drop=0
    
12-23 13:00:37.840  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  193 fps=5.0 q=18.0 size=    4316kB time=00:00:07.83 bitrate=4514.1kbits/s dup=184 drop=0
    
12-23 13:00:43.345  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  217 fps=5.0 q=18.0 size=    4848kB time=00:00:08.83 bitrate=4495.6kbits/s dup=207 drop=0
    
12-23 13:00:48.155  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  241 fps=5.0 q=18.0 size=    5304kB time=00:00:09.83 bitrate=4418.5kbits/s dup=230 drop=0
    
12-23 13:00:52.930  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  265 fps=5.0 q=19.0 size=    5874kB time=00:00:10.83 bitrate=4441.8kbits/s dup=253 drop=0
    
12-23 13:00:57.210  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  289 fps=5.0 q=18.0 size=    6205kB time=00:00:11.83 bitrate=4295.9kbits/s dup=276 drop=0
    
12-23 13:01:01.415  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  313 fps=5.0 q=18.0 size=    6747kB time=00:00:12.83 bitrate=4307.0kbits/s dup=299 drop=0
    
12-23 13:01:05.315  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  337 fps=5.1 q=18.0 size=    7126kB time=00:00:13.83 bitrate=4220.0kbits/s dup=322 drop=0
    
12-23 13:01:09.935  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  361 fps=5.1 q=17.0 size=    7522kB time=00:00:14.83 bitrate=4153.9kbits/s dup=345 drop=0
    
12-23 13:01:14.755  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  385 fps=5.1 q=18.0 size=    8072kB time=00:00:15.83 bitrate=4176.2kbits/s dup=368 drop=0
    
12-23 13:01:19.505  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  409 fps=5.1 q=18.0 size=    8618kB time=00:00:16.83 bitrate=4193.9kbits/s dup=391 drop=0
    
12-23 13:01:23.630  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  433 fps=5.1 q=17.0 size=    9074kB time=00:00:17.83 bitrate=4168.4kbits/s dup=414 drop=0
    
12-23 13:01:27.580  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  457 fps=5.1 q=17.0 size=    9423kB time=00:00:18.83 bitrate=4098.7kbits/s dup=437 drop=0
    
12-23 13:01:32.210  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  481 fps=5.2 q=17.0 size=    9908kB time=00:00:19.83 bitrate=4092.4kbits/s dup=460 drop=0
    
12-23 13:01:36.140  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  505 fps=5.2 q=16.0 size=   10238kB time=00:00:20.83 bitrate=4025.6kbits/s dup=483 drop=0
    
12-23 13:01:41.165  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  529 fps=5.2 q=16.0 size=   10758kB time=00:00:21.83 bitrate=4036.4kbits/s dup=506 drop=0
    
12-23 13:01:46.065  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  553 fps=5.2 q=16.0 size=   11214kB time=00:00:22.83 bitrate=4023.2kbits/s dup=529 drop=0
    
12-23 13:01:51.290  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  577 fps=5.2 q=16.0 size=   11836kB time=00:00:23.83 bitrate=4068.4kbits/s dup=552 drop=0
    
12-23 13:01:57.560  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  601 fps=5.2 q=17.0 size=   12537kB time=00:00:24.83 bitrate=4135.6kbits/s dup=575 drop=0
    
12-23 13:02:02.735  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  625 fps=5.1 q=18.0 size=   13864kB time=00:00:25.83 bitrate=4396.6kbits/s dup=598 drop=0
    
12-23 13:02:06.810  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  649 fps=5.1 q=18.0 size=   14322kB time=00:00:26.83 bitrate=4372.3kbits/s dup=621 drop=0
    
12-23 13:02:06.815  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  649 fps=4.9 q=18.0 size=   14322kB time=00:00:26.83 bitrate=4372.3kbits/s dup=621 drop=0
    
12-23 13:02:07.355  12665-12665/com.company.example E/FFMPEG﹕ Progress: frame=  649 fps=4.9 q=-1.0 Lsize=   14349kB time=00:00:27.04 bitrate=4346.9kbits/s dup=621 drop=0
    
12-23 13:02:07.355  12665-12665/com.company.example E/FFMPEG﹕ Progress: video:14345kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.024813%
    
12-23 13:02:07.360  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] frame I:3     Avg QP:21.67  size:383361
    
12-23 13:02:07.360  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] frame P:646   Avg QP:18.87  size: 20958
    
12-23 13:02:07.360  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] mb I  I16..4: 100.0%  0.0%  0.0%
    
12-23 13:02:07.360  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] mb P  I16..4:  4.4%  0.0%  0.0%  P16..4: 19.5%  0.0%  0.0%  0.0%  0.0%    skip:76.0%
    
12-23 13:02:07.360  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] final ratefactor: 26.82
    
12-23 13:02:07.370  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] coded y,uvDC,uvAC intra: 42.8% 45.6% 9.2% inter: 3.4% 16.7% 0.1%
    
12-23 13:02:07.370  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] i16 v,h,dc,p: 36% 24% 22% 19%
    
12-23 13:02:07.370  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] i8c dc,h,v,p: 51% 22% 19%  7%
    
12-23 13:02:07.370  12665-12665/com.company.example E/FFMPEG﹕ Progress: [libx264 @ 0x2b4012e0] kb/s:4345.62
    
12-23 13:02:07.400  12665-12665/com.company.example E/FFMPEG﹕ Success: ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
    
built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
    
configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    
libavutil      54.  7.100 / 54.  7.100
    
libavcodec     56.  1.100 / 56.  1.100
    
libavformat    56.  4.101 / 56.  4.101
    
libavdevice    56.  0.100 / 56.  0.100
    
libavfilter     5.  1.100 /  5.  1.100
    
libswscale      3.  0.100 /  3.  0.100
    
libswresample   1.  1.100 /  1.  1.100
    
libpostproc    53.  0.100 / 53.  0.100
    
Input #0, image2, from '/storage/emulated/0/Pictures/phototest/%d.jpg':
    
Duration: 00:00:28.00, start: 0.000000, bitrate: N/A
    
Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg), 2528x1856 [SAR 1:1 DAR 79:58], 1 fps, 1 tbr, 1 tbn, 1 tbc
    
Please use -b:a or -b:v, -b is ambiguous
    
[swscaler @ 0x2b3f7990] deprecated pixel format used, make sure you did set range correctly
    
[libx264 @ 0x2b4012e0] using SAR=1/1
    
[libx264 @ 0x2b4012e0] using cpu capabilities: none!
    
[libx264 @ 0x2b4012e0] profile Constrained Baseline, level 5.0
    
[libx264 @ 0x2b4012e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=2 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=300 keyint_min=24 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=4000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
    
Output #0, mp4, to '/storage/emulated/0/Pictures/phototest/result1.mp4':
    
Metadata:
    
encoder         : Lavf56.4.101
    
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 2528x1856 [SAR 1:1 DAR 79:58], q=-1--1, 4000 kb/s, 24 fps, 12288 tbn, 24 tbc
    
Metadata:
    
encoder         : Lavc56.1.100 libx264
    
Stream mapping:
    
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
frame=   49 fps= 11 q=17.0 size=     840kB time=00:00:01.83 bitrate=3752.6kbits/s dup=46 drop=0
    
frame=   73 fps=8.0 q=17.0 size=    1397kB time=00:00:02.83 bitrate=4039.0kbits/s dup=69 drop=0
    
frame=   97 fps=5.9 q=17.0 size=    1931kB time=00:00:03.83 bitrate=4126.8kbits/s dup=92 drop=0
    
frame=  121 fps=5.3 q=17.0 size=    2496kB time=00:00:04.83 bitrate=4229.6kbits/s dup=115 drop=0
    
frame=  145 fps=5.2 q=17.0 size=    3089kB time=00:00:05.83 bitrate=4338.5kbits/s dup=138 drop=0
    
frame=  169 fps=5.1 q=17.0 size=    3702kB time=00:00:06.83 bitrate=4437.9kbits/s dup=161 drop=0
    
frame=  193 fps=5.0 q=18.0 size=    4316kB time=00:00:07.83 bitrate=4514.1kbits/s dup=184 drop=0
    
frame=  217 fps=5.0 q=18.0 size=    4848kB time=00:00:08.83 bitrate=4495.6kbits/s dup=207 drop=0
    
frame=  241 fps=5.0 q=18.0 size=    5304kB time=00:00:09.83 bitrate=4418.5kbits/s dup=230 drop=0
    
frame=  265 fps=5.0 q=19.0 size=    5874kB time=00:00:10.83 bitrate=4441.8kbits/s dup=253 drop=0
    
frame=  28
    
12-23 13:02:07.430  12665-12665/com.company.example E/FFMPEG﹕ Finished.

    EDIT : Note that although it appears to run ffmpeg twice here, the output file is the correct size which seems to mean that the file isn’t getting overwritten with a corrupt version, so we can probably just assume there’s a bug with Logcat (right ?)

    EDIT 2 : Trying the same command on the PC works flawlessly. Playing back this video works fine on Android.

  • Issue in CV_FOURCC('H', '2', '6', '4')

    16 décembre 2014, par Ashwin

    I am trying to use H264 encoding type for compressing the live streaming from Camera (which is supporting the H264 codec) am getting below -
    [I am using OPENCV 3.0 beta version (latest)in windows 7 64 bit system .My camera is also supporting H264 codec (find more details below) ]
    My ffmpeg code got built with h264 lib :
    This build was compiled with the following external libraries :
    x264 20140826-git-dd79a61 http://videolan.org/developers/x264.html

    **error :**
    

    
Frame size = 1280x720
    
Could not find encoder for codec id 28: Encoder not foundERROR: Failed to write the video
    
Press any key to continue . . .

    Below is my code :

    int main(int argc, char *argv[])
    
{
    
 // QApplication a(argc, argv);
    

    
  VideoCapture cap(0); //capture webcam
    

    
  if (!cap.isOpened()) //if not successful then exit
    
  {
    
    cout << "Cannot open webcam";
    
    return -1;
    
  }
    

    
  namedWindow("Camera feed", 1); //create window
    

    
  cap.set(3, 1280);
    
  cap.set(4, 720);
    

    
  double dWidth  = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get width of frames of video
    
  double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get height of frames of video    
    

    

    
  Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
    

    
  cout &lt;&lt; "Frame size = " &lt;&lt; dWidth &lt;&lt; "x" &lt;&lt; dHeight &lt;&lt; endl;
    

    
  VideoWriter oVideoWriter("video.avi", CV_FOURCC('X', '2', '6', '4'), 30, frameSize);
    

    
  if(!oVideoWriter.isOpened())
    
  {
    
    cout &lt;&lt; "ERROR: Failed to write the video" &lt;&lt; endl;
    
    return -1;
    
  }
    
  while(1)
    
  {
    
    Mat frame;
    
    bool bSuccess = cap.read(frame); //read a new frame from video
    

    
    if(!bSuccess) //if unsuccessful, break loop
    
    {
    
        cout &lt;&lt; "Cannot read frame from video file" &lt;&lt; endl;
    
        break;
    
    }
    

    
    oVideoWriter.write(frame); //write the frame into the file
    
    imshow("Camera feed", frame); //show the frame in "Live Feed" window
    

    
    cout &lt;&lt; "Recording" &lt;&lt; endl;
    

    
    if (waitKey(30) == 27)
    

    
    {
    
      cout&lt;&lt; "Esc key is pressed by user" &lt;&lt; endl;
    
      break;
    
    }
    

    
  }
    
  return 0;
    
}
    
</int></int>

    Here is the proof that my camera is supporting the H264 :

    C:\Users>ffmpeg -f dshow -list_options true -i video="Logitech HD Pro Webcam C920"
    
ffmpeg version N-66116-g720c21d Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep  4 2014 22:09:48 with gcc 4.8.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  1.100 / 56.  1.100
    
  libavformat    56.  4.100 / 56.  4.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  0.103 /  5.  0.103
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
[dshow @ 0000000002faf680] DirectShow video device options
    
[dshow @ 0000000002faf680]  Pin "Capture"
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=2304x1296 fps=2 max s=2304x1296 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=2304x1536 fps=2 max s=2304x1536 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=2304x1296 fps=2 max s=2304x1296 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=2304x1536 fps=2 max s=2304x1536 fps=2
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]  Pin "Capture"
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
video=Logitech HD Pro Webcam C920: Immediate exit requested

  • How can I convince ffserver to save a locally-sourced webcam stream to a file in high resolution AND stream it in lower resolution ?

    2 novembre 2015, par Dominic Jacobssen

    We have a remote Linux machine, accessible over VPN, which has a USB webcam. We want to use this for video conferencing, but we also want to store the stream for archiving.

    Since the streaming bandwidth is limited, it makes sense to capture the stream on the same machine as the webcam and rsync that across after-the-fact, rather than trying to capture the streamed content, which is necessarily going to be poor quality.

    We’re trying to use ffmpeg and ffserver to achieve this, but with little success. Most of the articles on the internet either deal with just streaming a webcam, or rebroadcasting a remote stream. We found we had to recompile ffserver because of a missing "my_addr->sin_family = AF_INET ;" in the version of ffserver.c we had been using, since fixed in git.

    Here’s the ffserver.conf we’re trying to use :

    Port 43688
    
BindAddress 127.0.0.1
    
MaxHTTPConnections 2000
    
MaxClients 1000
    
MaxBandwidth 1000
    
CustomLog -
    
NoDaemon
    
<feed>
    
ReadOnlyFile /tmp/feed.ffm
    
FileMaxSize 20M
    
ACL allow 127.0.0.1
    
</feed>
    
<stream>
    
Feed feed.ffm
    
Format mp4
    
VideoSize qvga
    
VideoGopSize 12
    
VideoHighQuality
    
Video4MotionVector
    
VideoCodec libx264
    
VideoBitRate 100
    
VideoBufferSize 40
    
VideoFrameRate 5
    
VideoQMin 3
    
VideoQMax 31
    
AudioCodec libfaac
    
AudioBitRate 32
    
AudioChannels 2
    
AudioSampleRate 22050
    
ACL allow localhost
    
</stream>

    When we fire this up, we get the error :

    Unable to create feed file '/tmp/feed.ffm' as it is marked readonly

    Fair enough, but this is not what is implied in the docs. Changing the directive to :

    File /tmp/feed.ffm

    allows ffserver to fire up and appear to sit and wait for ffmpeg to connect to it. However, when we fire up ffmpeg with the command :

    ffmpeg -f alsa -i pulse -r 16000 -f video4linux2 -s qvga -i /dev/video0 -r 5 -f mp4 -vcodec libx264 -sameq -acodec libfaac -ab 32k http://127.0.0.1:43688/feed.ffm

    then the webcam lights up and ffserver acknowledges the connection with the messages :

    New connection: POST /feed.ffm
    
[POST] "/feed.ffm HTTP/1.1" 200 0

    but after a few seconds we get the errors :

    [mp4 @ 0x264b160] muxer does not support non seekable output
    
Could not write header for output file #0 (incorrect codec parameters ?)

    We’ve tried various other formats (mpeg, mpegts, avi) and codecs (mpeg1video, mpeg2video, mpeg4), all without success.

    Moreover, we were under the impression that ffserver could reencode input format to a lower resolution for streaming, but if the stream resolution doesn’t match the feed resolution, we get an error about the resolutions not matching.

    Has anyone ever managed to get this working correctly ? I’ve read about vlc being able to do something like this, but the vlc command lines are well nigh impenetrable.

    Thanks !

    Dominic

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