Newest 'ffmpeg' Questions - Stack Overflow
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using FFmpeg for android without any C/C++ or make knowledge
3 octobre 2014, par Lik SifI would like to use FFmpeg library on my android app. I have no C/C++/Make knowledge and all the threads I've been reading about it talk about stuff I completely don't understand.
Is there any pre-compiled library which I can add to my project, then add a simple 'import' statement on my java class and then call it?
Thanks
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OpenCV VideoCapture not read any video File in Windows 7 32bit
3 octobre 2014, par The_Maxtori try to read .avi or .mpeg video file using VideoCapture class of OpenCV2.4.8 in C++ using QtCreator and CMake 2.8.12.1. Before built OpenCV, i download FFMPEG static version and put them into Program Files directory, i add their path into enviroments variable PATH, then i download K Lite Codec Pack Full, install it and only then i built OpenCV with CMAKE and mingw provide by Qt. After installation i add to PATH the right path of built OpenCV. The stream from webcam works fine, but the stream from a video file doesn't work. I tried on Windows 7 32bit and Windows 8 64bit. Here is the code
#includeimgproc/imgproc.hpp> #include highgui/highgui.hpp> #include core/core.hpp> #include "opencv2/opencv.hpp" cv::Mat img; cv::VideoCapture cap("Prova.avi"); std::cerr << cap.isOpened() << std::endl; while(cap.read(img)){ cv::imshow("Opencv", img); cv::waitKey(33); } The same code works on Ubuntu 12.04 with the same version of OpenCV and with the ffmpeg build by myself. What is wrong?
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Encoding a readable movie by QuickTime using FFMPEG
3 octobre 2014, par itamarbI'm trying to encode an image sequence using the following command:
ffmpeg.exe -i %d.png -f mp4 -vcodec h264 test.mp4However, QuickTime failed to open this file or sometimes play a black movie, while this movie plays great in VLC player. Any suggestions how to make it play well in QuickTime?
Here is the output:
ffmpeg.exe -i %d.png -f mp4 -vcodec libx264 13.mp4 ffmpeg version N-49044-g89afa63 Copyright (c) 2000-2013 the FFmpeg developers built on Jan 19 2013 20:36:06 with gcc 4.7.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg sm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --e nable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --e nable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --en able-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable -libxavs --enable-libxvid --enable-zlib --enable-filter=frei0r libavutil 52. 15.100 / 52. 15.100 libavcodec 54. 89.100 / 54. 89.100 libavformat 54. 61.101 / 54. 61.101 libavdevice 54. 3.102 / 54. 3.102 libavfilter 3. 32.101 / 3. 32.101 libswscale 2. 2.100 / 2. 2.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 2.100 / 52. 2.100 [image2 @ 0221b940] max_analyze_duration 5000000 reached at 5000000 microseconds Input #0, image2, from '%d.png': Duration: 00:01:19.36, start: 0.000000, bitrate: N/A Stream #0:0: Video: png, rgb24, 639x480, 25 fps, 25 tbr, 25 tbn, 25 tbc [libx264 @ 0221edc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE 4.2 AVX [libx264 @ 0221edc0] profile High 4:4:4 Predictive, level 3.0, 4:4:4 8-bit [libx264 @ 0221edc0] 264 - core 129 r2230 1cffe9f - H.264/MPEG-4 AVC codec - Cop yleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro ma_qp_offset=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 in terlaced=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 scenecu t=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 '13.mp4': Metadata: encoder : Lavf54.61.101 Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv444p, 639x480, q=-1--1 , 12800 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (png -> libx264) Press [q] to stop, [?] for help frame= 76 fps=0.0 q=28.0 size= 3kB time=00:00:00.96 bitrate= 22.3kbits/ frame= 156 fps=155 q=28.0 size= 7kB time=00:00:04.16 bitrate= 14.7kbits/ frame= 219 fps=145 q=28.0 size= 12kB time=00:00:06.68 bitrate= 14.1kbits/ frame= 283 fps=141 q=28.0 size= 16kB time=00:00:09.24 bitrate= 14.2kbits/ frame= 352 fps=140 q=28.0 size= 25kB time=00:00:12.00 bitrate= 17.4kbits/ -
FFmpeg and libavcode : return frames in decode order (not display order)
3 octobre 2014, par KrishnaI wanted to know if it is possible to for libavcodec to return frames in decode order instead of display order? Is there any flag that will enable this?
I am using av_read_frame() and avcodec_decode_video2() to read a video frame-by-frame.
Thank you!
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I use ffmpeg dinamically to edit a local hosted video to be streamed on iPhone over 3G [on hold]
3 octobre 2014, par Luchian ChivoiuI use ffmpeg dinamically to edit a local hosted video to be streamed on iPhone over 3G .
I use this line : "ffmpeg -i C:\file1.mp4 -s 640x480 -r 30000/1001 -b:a 56k -bt 40k -b:v 50k -maxrate 10M -bufsize 10M -coder 0 -bf 0 -refs 1 -ar 48000 -ab 52k C:\file2.mp4" and it doesn't work to open on iPhone the transformed file called "file2.mp4". I use Web Api and C# to call the ffmpeg locally and the resulted file opens on the browser but still doesn't want to stream to an iPhone over 3G only if it's over WiFi.
Here Apple explains the process but I still didn't get it work .
One example that can't be played on IPhone is this one : http://www.starlety.com/Videos/8ada5277-424a-e411-b2e5-00ff91d7f3dd.mp4
