ubuntu16.04下利用wigwam安裝mpegflow

最近想從264視頻中提取運動向量（motion vector),ffmpeg的ffplay是可以顯示運動向量在播放畫面中的，但是具體怎麼樣將運動向量提取到文件中似乎沒有給出解決辦法，自己Google了半天才發現一個github的項目，發現其可以提取運動向量到文件中，也可以顯示運動向量在播放的畫面當中。具體的主頁是：

https://github.com/vadimkantorov/mpegflow

其主要的功能也是十分簡單：

./mpegflow examples/mpi_sintel_final_alley_1.avi > examples/alley_1.txt

還有一下幾種模式可供選擇：

在此不多解釋。

然後主要是這個項目的編譯，自己在windows下面編譯似乎是通過了，但是在實際運用的過程中似乎存在問題，只能使用一種模式提取運動向量(--raw模式)，其他的幾種模式似乎都沒有成功，所以索性放棄，在Ubuntu16.04下進行編譯。

查看其編譯說明是依賴於FFmpeg軟件包的,所以在編譯之前是要安裝ffmpeg的，ffmpeg其官網上已經有源代碼可供Linux編譯，具體我也是沒怎麼去試，看到作者推薦使用他自己的另一個項目wigwam安裝ffmpeg，也就沒有多想，直接安裝wigwam

wigwam的主頁是：

http://wigwam.in/

在其主頁上也很詳細地寫明瞭安裝方法。

第一：

在～/.bashrc文件中末尾添加以下內容：

alias wigwam='python2.7 <($([ -z "$(which curl)" ] && echo "wget -nv -O -" || echo "curl -sS") https://raw.githubusercontent.com/vadimkantorov/wigwam/master/wigwam.py) --repo https://github.com/vadimkantorov/wigwam/tree/master/wigs'

sudo vim ～/.bashrc

修改後保存退出，然後reload一下：

source ～/.bashrc

然後就是進行ffmpeg的安裝：
wigwam init

wigwam install ffmpeg

其中安裝ffmpeg的過程稍微久一點，十分鐘左右。

安裝完後進行mpegflow的編譯，首先得讓make發現你的ffmpeg在什麼地方：

wigwam in

切換到mpegflow的目錄編譯：

make

有一些warning可以忽略，編譯成功後會生成可執行文件mpegflow

最後可以在example文件夾下面驗證以下mpegflow，切換到mpegflow文件夾下面運行bash腳本文件：

$ /\ $ bash extract_mpeg_flow.sh

然後就會生成4個txt文件，具體的命令可以查看extract_mpeg_flow.sh

注意：因爲mpegflow是依賴於FFmpeg的，所以一定要在使用wigwam in命令進入wigwam環境後才能正常運行，不然會提示找不到

一些庫：
../mpegflow: error while loading shared libraries: libavformat.so.57: cannot open shared object file: No such file or directory
../mpegflow: error while loading shared libraries: libavformat.so.57: cannot open shared object file: No such file or directory
../mpegflow: error while loading shared libraries: libavformat.so.57: cannot open shared object file: No such file or directory
../mpegflow: error while loading shared libraries: libavformat.so.57: cannot open shared object file: No such file or directory

終端輸入exit可以退出wigwam環境。

2017/10/14補充：

使用這種方法每次都必須進入wigwam環境才能夠正常使用，所以在正常安裝ffmpeg之後，可以直接進行編譯，關於Ubuntu下安裝FFmpeg的具體方法可以參考我的另一篇博文，在安裝好FFmpeg之後，即可進行mpegflow的編譯：

直接make

這個過程中會出現報錯：

/usr/bin/ld: cannot find -lbz2
collect2: error: ld returned 1 exit status
Makefile:6: recipe for target 'mpegflow' failed
make: *** [mpegflow] Error 1
根據提示是因爲缺少bz2的庫，所以進行安裝：

$ sudo apt-get install libbz2-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  bzip2-doc
The following NEW packages will be installed:
  bzip2-doc libbz2-dev
0 upgraded, 2 newly installed, 0 to remove and 186 not upgraded.
Need to get 324 kB of archives.
After this operation, 556 kB of additional disk space will be used.
Do you want to continue? [Y/n]

安裝之後重新make,又會出現一系列錯誤：

undefined reference to `dlclose'

undefined reference to `dlsym'

undefined reference to `dlclose'

解決方法參考了：http://www.xuebuyuan.com/220857.html

$ vim ./Makefile

在LDFLAGS一行的後面加上 -ldl
最後進行make,編譯通過，在此記錄一下warning：

mpegflow.cpp: In function ‘void ffmpeg_init()’:
mpegflow.cpp:75:56: warning: ‘AVStream::codec’ is deprecated [-Wdeprecated-declarations]
   AVCodecContext *enc = ffmpeg_pFormatCtx->streams[i]->codec;
                                                        ^
In file included from mpegflow.cpp:10:0:
/usr/local/include/libavformat/avformat.h:893:21: note: declared here
     AVCodecContext *codec;
                     ^
mpegflow.cpp:75:56: warning: ‘AVStream::codec’ is deprecated [-Wdeprecated-declarations]
   AVCodecContext *enc = ffmpeg_pFormatCtx->streams[i]->codec;
                                                        ^
In file included from mpegflow.cpp:10:0:
/usr/local/include/libavformat/avformat.h:893:21: note: declared here
     AVCodecContext *codec;
                     ^
mpegflow.cpp:75:56: warning: ‘AVStream::codec’ is deprecated [-Wdeprecated-declarations]
   AVCodecContext *enc = ffmpeg_pFormatCtx->streams[i]->codec;
                                                        ^
In file included from mpegflow.cpp:10:0:
/usr/local/include/libavformat/avformat.h:893:21: note: declared here
     AVCodecContext *codec;
                     ^
mpegflow.cpp: In function ‘bool process_frame(AVPacket*)’:
mpegflow.cpp:102:12: warning: ‘int avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, const AVPacket*)’ is deprecated [-Wdeprecated-declarations]
  int ret = avcodec_decode_video2(ffmpeg_pVideoStream->codec, ffmpeg_pFrame, &got_frame, pkt);
            ^
In file included from mpegflow.cpp:9:0:
/usr/local/include/libavcodec/avcodec.h:4901:5: note: declared here
 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
     ^
mpegflow.cpp:102:12: warning: ‘int avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, const AVPacket*)’ is deprecated [-Wdeprecated-declarations]
  int ret = avcodec_decode_video2(ffmpeg_pVideoStream->codec, ffmpeg_pFrame, &got_frame, pkt);
            ^
In file included from mpegflow.cpp:9:0:
/usr/local/include/libavcodec/avcodec.h:4901:5: note: declared here
 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
     ^
mpegflow.cpp:102:55: warning: ‘AVStream::codec’ is deprecated [-Wdeprecated-declarations]
  int ret = avcodec_decode_video2(ffmpeg_pVideoStream->codec, ffmpeg_pFrame, &got_frame, pkt);
                                                       ^
In file included from mpegflow.cpp:10:0:
/usr/local/include/libavformat/avformat.h:893:21: note: declared here
     AVCodecContext *codec;
                     ^
mpegflow.cpp:102:55: warning: ‘AVStream::codec’ is deprecated [-Wdeprecated-declarations]
  int ret = avcodec_decode_video2(ffmpeg_pVideoStream->codec, ffmpeg_pFrame, &got_frame, pkt);
                                                       ^
In file included from mpegflow.cpp:10:0:
/usr/local/include/libavformat/avformat.h:893:21: note: declared here
     AVCodecContext *codec;
                     ^
mpegflow.cpp:102:55: warning: ‘AVStream::codec’ is deprecated [-Wdeprecated-declarations]
  int ret = avcodec_decode_video2(ffmpeg_pVideoStream->codec, ffmpeg_pFrame, &got_frame, pkt);
                                                       ^
In file included from mpegflow.cpp:10:0:
/usr/local/include/libavformat/avformat.h:893:21: note: declared here
     AVCodecContext *codec;
                     ^
mpegflow.cpp:102:92: warning: ‘int avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, const AVPacket*)’ is deprecated [-Wdeprecated-declarations]
  int ret = avcodec_decode_video2(ffmpeg_pVideoStream->codec, ffmpeg_pFrame, &got_frame, pkt);
                                                                                            ^
In file included from mpegflow.cpp:9:0:
/usr/local/include/libavcodec/avcodec.h:4901:5: note: declared here
 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
     ^
mpegflow.cpp: In function ‘bool read_frame(int64_t&, char&, std::vector<AVMotionVector>&)’:
mpegflow.cpp:154:23: warning: ‘AVFrame::pkt_pts’ is deprecated [-Wdeprecated-declarations]
  pts = ffmpeg_pFrame->pkt_pts != AV_NOPTS_VALUE ? ffmpeg_pFrame->pkt_pts : (ffmpeg_pFrame->pkt_dts
                       ^
In file included from /usr/local/include/libavcodec/avcodec.h:38:0,
                 from mpegflow.cpp:9:
/usr/local/include/libavutil/frame.h:279:13: note: declared here
     int64_t pkt_pts;
             ^
mpegflow.cpp:154:23: warning: ‘AVFrame::pkt_pts’ is deprecated [-Wdeprecated-declarations]
  pts = ffmpeg_pFrame->pkt_pts != AV_NOPTS_VALUE ? ffmpeg_pFrame->pkt_pts : (ffmpeg_pFrame->pkt_dts
                       ^
In file included from /usr/local/include/libavcodec/avcodec.h:38:0,
                 from mpegflow.cpp:9:
/usr/local/include/libavutil/frame.h:279:13: note: declared here
     int64_t pkt_pts;
             ^
mpegflow.cpp:154:23: warning: ‘AVFrame::pkt_pts’ is deprecated [-Wdeprecated-declarations]
  pts = ffmpeg_pFrame->pkt_pts != AV_NOPTS_VALUE ? ffmpeg_pFrame->pkt_pts : (ffmpeg_pFrame->pkt_dts
                       ^
In file included from /usr/local/include/libavcodec/avcodec.h:38:0,
                 from mpegflow.cpp:9:
/usr/local/include/libavutil/frame.h:279:13: note: declared here
     int64_t pkt_pts;
             ^
mpegflow.cpp:154:66: warning: ‘AVFrame::pkt_pts’ is deprecated [-Wdeprecated-declarations]
  pts = ffmpeg_pFrame->pkt_pts != AV_NOPTS_VALUE ? ffmpeg_pFrame->pkt_pts : (ffmpeg_pFrame->pkt_dts
                                                                  ^
In file included from /usr/local/include/libavcodec/avcodec.h:38:0,
                 from mpegflow.cpp:9:
/usr/local/include/libavutil/frame.h:279:13: note: declared here
     int64_t pkt_pts;
             ^
mpegflow.cpp:154:66: warning: ‘AVFrame::pkt_pts’ is deprecated [-Wdeprecated-declarations]
  pts = ffmpeg_pFrame->pkt_pts != AV_NOPTS_VALUE ? ffmpeg_pFrame->pkt_pts : (ffmpeg_pFrame->pkt_dts
                                                                  ^
In file included from /usr/local/include/libavcodec/avcodec.h:38:0,
                 from mpegflow.cpp:9:
/usr/local/include/libavutil/frame.h:279:13: note: declared here
     int64_t pkt_pts;
             ^
mpegflow.cpp:154:66: warning: ‘AVFrame::pkt_pts’ is deprecated [-Wdeprecated-declarations]
  pts = ffmpeg_pFrame->pkt_pts != AV_NOPTS_VALUE ? ffmpeg_pFrame->pkt_pts : (ffmpeg_pFrame->pkt_dts
                                                                  ^
In file included from /usr/local/include/libavcodec/avcodec.h:38:0,
                 from mpegflow.cpp:9:
/usr/local/include/libavutil/frame.h:279:13: note: declared here
     int64_t pkt_pts;

ubuntu16.04下利用wigwam安裝mpegflow

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