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  • OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error

    19 avril, par user2262504

    I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out.

    



    It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec 'libx264'" error.

    



    Anyone has ideas to solve this problem ?

    



    More specifically :

    



      

    1. anyone knows where and how OpenCV invoke ffmpeg API ?
    2. 


    3. how to change ffmpeg default settings using code, hopefull, can be easily embeded into OpenCV ?
    4. 


    5. will changes of default in ffmpeg be carried to libx264 ?
    6. 


    



    Errors :

    



    1. Uising CV_FOURCC(&#x27;H&#x27;, &#x27;2&#x27;, &#x27;6&#x27;, &#x27;4&#x27;)&#xA;[libx264 @ 0x255de40] broken ffmpeg default settings detected&#xA;[libx264 @ 0x255de40] use an encoding preset (e.g. -vpre medium)&#xA;[libx264 @ 0x255de40] preset usage: -vpre <speed> -vpre <profile>&#xA;[libx264 @ 0x255de40] speed presets are listed in x264 --help&#xA;[libx264 @ 0x255de40] profile is optional; x264 defaults to high&#xA;Could not open codec &#x27;libx264&#x27;: Unspecified error&#xA;&#xA;2. Using FOURCC = -1 to invoke user customized codec&#xA;OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv &#xA;backend doesn&#x27;t support this codec acutally.) in CvVideoWriter_GStreamer::open, &#xA;file /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp, &#xA;line 505 terminate called after throwing an instance of &#x27;cv::Exception&#x27;&#xA;what():  /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp:&#xA;505: error: (-210) Gstreamer Opencv backend doesn&#x27;t support this codec acutally.&#xA;in function CvVideoWriter_GStreamer::open&#xA;</profile></speed>

    &#xA;&#xA;

    Codes :

    &#xA;&#xA;

    int main(int argc, char *argv[])&#xA;{&#xA;    VideoWriter outputVideo;&#xA;    bool fourcc_on = true; //switch on / off different error&#xA;    if (fourcc_on)&#xA;        outputVideo.open("outVideo.avi", CV_FOURCC(&#x27;H&#x27;, &#x27;2&#x27;, &#x27;6&#x27;, &#x27;4&#x27;), 25, Size(100, 100), true);&#xA;    else&#xA;        outputVideo.open("outVideo.avi", -1, 25, Size(100, 100), true);&#xA;&#xA;    if (!outputVideo.isOpened())&#xA;    {&#xA;        cout  &lt;&lt; "Could not open the output video for write" &lt;&lt; endl;&#xA;        return -1;&#xA;    }&#xA;    return 0;&#xA;}&#xA;

    &#xA;&#xA;

    OpenCV Configuration :

    &#xA;&#xA;

    -- Detected version of GNU GCC: 46 (406)&#xA;-- Found OpenEXR: /usr/lib/libIlmImf.so&#xA;-- Looking for linux/videodev.h&#xA;-- Looking for linux/videodev.h - not found&#xA;-- Looking for linux/videodev2.h&#xA;-- Looking for linux/videodev2.h - found&#xA;-- Looking for sys/videoio.h&#xA;-- Looking for sys/videoio.h - not found&#xA;-- Looking for libavformat/avformat.h&#xA;-- Looking for libavformat/avformat.h - found&#xA;-- Looking for ffmpeg/avformat.h&#xA;-- Looking for ffmpeg/avformat.h - not found&#xA;-- Could NOT find JNI (missing:  JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) &#xA;-- &#xA;-- General configuration for OpenCV 2.4.8 =====================================&#xA;--   Version control:               unknown&#xA;-- &#xA;--   Platform:&#xA;--     Host:                        Linux 3.8.0-38-generic x86_64&#xA;--     CMake:                       2.8.7&#xA;--     CMake generator:             Unix Makefiles&#xA;--     CMake build tool:            /usr/bin/make&#xA;--     Configuration:               RELEASE&#xA;-- &#xA;--   C/C&#x2B;&#x2B;:&#xA;--     Built as dynamic libs?:      YES&#xA;--     C&#x2B;&#x2B; Compiler:                /usr/bin/c&#x2B;&#x2B;  (ver 4.6)&#xA;--     C&#x2B;&#x2B; flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG&#xA;--     C&#x2B;&#x2B; flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG&#xA;--     C Compiler:                  /usr/bin/gcc&#xA;--     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG&#xA;--     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG&#xA;--     Linker flags (Release):      &#xA;--     Linker flags (Debug):        &#xA;--     Precompiled headers:         YES&#xA;-- &#xA;--   OpenCV modules:&#xA;--     To be built:                 core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib python stitching superres ts videostab&#xA;--     Disabled:                    world&#xA;--     Disabled by dependency:      -&#xA;--     Unavailable:                 androidcamera dynamicuda java&#xA;-- &#xA;--   GUI: &#xA;--     QT:                          NO&#xA;--     GTK&#x2B; 2.x:                    YES (ver 2.24.10)&#xA;--     GThread :                    YES (ver 2.32.4)&#xA;--     GtkGlExt:                    NO&#xA;--     OpenGL support:              NO&#xA;-- &#xA;--   Media I/O: &#xA;--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.3.4)&#xA;--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )&#xA;--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.46)&#xA;--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 3.9.5)&#xA;--     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)&#xA;--     OpenEXR:                     /usr/lib/libImath.so /usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so /usr/lib/libIlmThread.so (ver 1.6.1)&#xA;-- &#xA;--   Video I/O:&#xA;--     DC1394 1.x:                  NO&#xA;--     DC1394 2.x:                  YES (ver 2.2.0)&#xA;--     FFMPEG:                      YES&#xA;--       codec:                     YES (ver 55.58.105)&#xA;--       format:                    YES (ver 55.37.101)&#xA;--       util:                      YES (ver 52.78.100)&#xA;--       swscale:                   YES (ver 2.6.100)&#xA;--       gentoo-style:              YES&#xA;--     GStreamer:                   &#xA;--       base:                      YES (ver 0.10.36)&#xA;--       app:                       YES (ver 0.10.36)&#xA;--       video:                     YES (ver 0.10.36)&#xA;--     OpenNI:                      NO&#xA;--     OpenNI PrimeSensor Modules:  NO&#xA;--     PvAPI:                       NO&#xA;--     GigEVisionSDK:               NO&#xA;--     UniCap:                      NO&#xA;--     UniCap ucil:                 NO&#xA;--     V4L/V4L2:                    Using libv4l (ver 1.0.1)&#xA;--     XIMEA:                       NO&#xA;--     Xine:                        NO&#xA;-- &#xA;--   Other third-party libraries:&#xA;--     Use IPP:                     NO&#xA;--     Use Eigen:                   NO&#xA;--     Use TBB:                     NO&#xA;--     Use OpenMP:                  NO&#xA;--     Use GCD                      NO&#xA;--     Use Concurrency              NO&#xA;--     Use C=:                      NO&#xA;--     Use Cuda:                    NO&#xA;--     Use OpenCL:                  YES&#xA;-- &#xA;--   OpenCL:&#xA;--     Version:                     dynamic&#xA;--     Include path:                /home/shixudongleo/Downloads/opencv-2.4.8/3rdparty/include/opencl/1.2&#xA;--     Use AMD FFT:                 NO&#xA;--     Use AMD BLAS:                NO&#xA;-- &#xA;--   Python:&#xA;--     Interpreter:                 /usr/bin/python (ver 2.7.3)&#xA;--     Libraries:                   /usr/lib/libpython2.7.so&#xA;--     numpy:                       /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.6.1)&#xA;--     packages path:               lib/python2.7/dist-packages&#xA;-- &#xA;--   Java:&#xA;--     ant:                         NO&#xA;--     JNI:                         NO&#xA;--     Java tests:                  NO&#xA;-- &#xA;--   Documentation:&#xA;--     Build Documentation:         NO&#xA;--     Sphinx:                      NO&#xA;--     PdfLaTeX compiler:           /usr/bin/pdflatex&#xA;-- &#xA;--   Tests and samples:&#xA;--     Tests:                       YES&#xA;--     Performance tests:           YES&#xA;--     C/C&#x2B;&#x2B; Examples:              NO&#xA;-- &#xA;--   Install path:                  /usr/local&#xA;-- &#xA;--   cvconfig.h is in:              /home/shixudongleo/Downloads/opencv-2.4.8/build&#xA;-- -----------------------------------------------------------------&#xA;-- &#xA;-- Configuring done&#xA;-- Generating done&#xA;-- Build files have been written to: /home/XXX/Downloads/opencv-2.4.8/build&#xA;

    &#xA;&#xA;

    FFMPEG

    &#xA;&#xA;

    ffmpeg is enable to support OpenCV and libx264 is enabled when compiling ffmpeg.&#xA;By using ffmpeg command line, libx264 is running normally.

    &#xA;&#xA;

    $ ffmpeg -i test.avi -vcodec libx264 test.mp4&#xA;ffmpeg -i test.avi -vcodec libx264 test.mp4 > ~/Downloads/ffmpeg_log.txt&#xA;ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers&#xA;  built on Apr 24 2014 16:39:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)&#xA;  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-pic&#xA;  libavutil      52. 78.100 / 52. 78.100&#xA;  libavcodec     55. 58.105 / 55. 58.105&#xA;  libavformat    55. 37.101 / 55. 37.101&#xA;  libavdevice    55. 13.100 / 55. 13.100&#xA;  libavfilter     4.  4.100 /  4.  4.100&#xA;  libswscale      2.  6.100 /  2.  6.100&#xA;  libswresample   0. 18.100 /  0. 18.100&#xA;  libpostproc    52.  3.100 / 52.  3.100&#xA;Input #0, avi, from &#x27;test.avi&#x27;:&#xA;  Duration: 00:00:03.73, start: 0.000000, bitrate: 1757 kb/s&#xA;    Stream #0:0: Video: msvideo1 (CRAM / 0x4D415243), rgb555le, 320x240, 1781 kb/s, 15 tbr, 15 tbn, 15 tbc&#xA;    Metadata:&#xA;      title           : julius.avi Video #1&#xA;File &#x27;test.mp4&#x27; already exists. Overwrite ? [y/N] y&#xA;No pixel format specified, yuv444p for H.264 encoding chosen.&#xA;Use -pix_fmt yuv420p for compatibility with outdated media players.&#xA;[libx264 @ 0x25d08e0] using cpu capabilities: none!&#xA;[libx264 @ 0x25d08e0] profile High 4:4:4 Predictive, level 1.2, 4:4:4 8-bit&#xA;[libx264 @ 0x25d08e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=4 threads=12 lookahead_threads=1 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=15 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&#xA;Output #0, mp4, to &#x27;test.mp4&#x27;:&#xA;  Metadata:&#xA;    encoder         : Lavf55.37.101&#xA;    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 320x240, q=-1--1, 15360 tbn, 15 tbc&#xA;    Metadata:&#xA;      title           : julius.avi Video #1&#xA;Stream mapping:&#xA;  Stream #0:0 -> #0:0 (msvideo1 -> libx264)&#xA;Press [q] to stop, [?] for help&#xA;frame=   56 fps=0.0 q=-1.0 Lsize=     321kB time=00:00:03.60 bitrate= 731.0kbits/s    &#xA;video:320kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.409949%&#xA;[libx264 @ 0x25d08e0] frame I:3     Avg QP:15.36  size:  7975&#xA;[libx264 @ 0x25d08e0] frame P:38    Avg QP:26.05  size:  6230&#xA;[libx264 @ 0x25d08e0] frame B:15    Avg QP:28.25  size:  4418&#xA;[libx264 @ 0x25d08e0] consecutive B-frames: 46.4% 53.6%  0.0%  0.0%&#xA;[libx264 @ 0x25d08e0] mb I  I16..4:  1.4% 72.8% 25.8%&#xA;[libx264 @ 0x25d08e0] mb P  I16..4:  1.6%  5.7% 15.1%  P16..4:  7.6%  6.3%  7.4%  0.0%  0.0%    skip:56.3%&#xA;[libx264 @ 0x25d08e0] mb B  I16..4:  0.2%  1.0%  2.0%  B16..8: 13.3%  7.8%  8.7%  direct: 8.3%  skip:58.8%  L0:34.9% L1:36.6% BI:28.5%&#xA;[libx264 @ 0x25d08e0] 8x8 transform intra:37.7% inter:2.3%&#xA;[libx264 @ 0x25d08e0] coded y,u,v intra: 52.1% 42.1% 30.1% inter: 19.6% 9.2% 5.2%&#xA;[libx264 @ 0x25d08e0] i16 v,h,dc,p: 56% 17% 24%  2%&#xA;[libx264 @ 0x25d08e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 16% 68%  1%  1%  1%  1%  1%  1%&#xA;[libx264 @ 0x25d08e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 28%  5%  6%  5%  7%  5%  6%&#xA;[libx264 @ 0x25d08e0] Weighted P-Frames: Y:31.6% UV:21.1%&#xA;[libx264 @ 0x25d08e0] ref P L0: 70.5%  9.0% 12.1%  6.5%  2.0%&#xA;[libx264 @ 0x25d08e0] ref B L0: 91.3%  8.7%&#xA;[libx264 @ 0x25d08e0] kb/s:700.56&#xA;

    &#xA;

  • ffmpeg error "No such file or directory" while compiling a video file compression

    13 janvier 2016, par Abraham Gharyali

    Firstly I have checked many questions and answers related to my question, but unfortunately none of them solves my problem.

    I have implemented ffmpeg library in my project, using it for 2 tasks :

    1). adding watermark on video.

    2). video compression.

    I am able to apply watermark on recorded video successfully using this command :

    {"-y" ,"-i", "/storage/emulated/0/Booms/Videos/video1122150738.mp4","-strict","experimental", "-vf", "movie="
    + watermarkFile + " [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]","-s", "320x240","-r", "30", "-b", "15496k", "-vcodec", "mpeg4","-ab", "48000", "-ac", "2", "-ar", "22050", "/storage/emulated/0/Shared/Videos/video.mp4"}

    "watermarkFile" is the location of .png watermark file

    Now I need to compress video, for that i used this command :

    "ffmpeg -i "+"/storage/emulated/0/Booms/Videos/video1122150738.mp4"+" -vcodec mpeg4 -s 320x240 -r 25 -y "+"/storage/emulated/0/Shared/Videos/video.mp4";

    It gives error "No such file or directory". please see the logs.

    01-11 15:32:39.283 28027-28027/ I/FFmpeg: Loading FFmpeg for armv7-neon CPU
    01-11 15:32:39.439 28027-28027/ D/FFMPEG: onSuccess.
    01-11 15:32:39.440 28027-28027/ D/FFMPEG: onFinish.
    01-11 15:32:55.584 28027-28027/ D/FFMPEG compress: input path: /storage/emulated/0/Booms/Videos/video1122150738.mp4
    01-11 15:32:55.585 28027-28027/ D/FFMPEG compress: output path: /storage/emulated/0/Shared/Videos/video.mp4
    01-11 15:32:55.587 28027-28027/ D/FFMPEG compress: Started.
    01-11 15:32:55.618 28027-28089/ D/FFmpeg: Running publishing updates method
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress: WARNING: linker: /data/data/packge_name/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress: ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress:   built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: 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=
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress:   libavutil      54.  7.100 / 54.  7.100
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress:   libavcodec     56.  1.100 / 56.  1.100
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress:   libavformat    56.  4.101 / 56.  4.101
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress:   libavdevice    56.  0.100 / 56.  0.100
    01-11 15:32:55.662 28027-28027/ D/FFMPEG compress: Progress:   libavfilter     5.  1.100 /  5.  1.100
    01-11 15:32:55.663 28027-28027/ D/FFMPEG compress: Progress:   libswscale      3.  0.100 /  3.  0.100
    01-11 15:32:55.663 28027-28027/ D/FFMPEG compress: Progress:   libswresample   1.  1.100 /  1.  1.100
    01-11 15:32:55.663 28027-28027/ D/FFMPEG compress: Progress:   libpostproc    53.  0.100 / 53.  0.100
    01-11 15:32:55.663 28027-28027/ D/FFMPEG compress: Progress: ffmpeg -i /storage/emulated/0/Booms/Videos/_video1122150738.mp4 -vcodec mpeg4 -s 320x240 -r 25 -y /storage/emulated/0/Shared/Videos/video.mp4: No such file or directory
    01-11 15:32:55.663 28027-28027/ D/FFMPEG compress: Failure: WARNING: linker: /data/data/package_name/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
                                                                                 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)
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                                                                                   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
                                                                                 ffmpeg -i /storage/emulated/0/Booms/Videos/video1122150738.mp4 -vcodec mpeg4 -s 320x240 -r 25 -y /storage/emulated/0/Shared/Videos/video.mp4: No such file or directory
    01-11 15:32:55.663 28027-28027/ D/FFMPEG compress: Finished.

    for both operations i input .mp4 file and need .mp4 file in output.

    Same process works for watermarking and not working for compression.

    My compress command is correct because I checked the same command compressing video in my windows pc using command prompt.

    I don’t understand what i am doing wrong.

    Any help would be appreciated.

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