在OpenCV中保存帶有文字覆蓋的視頻

我寫了一個腳本，記錄來自我的網絡攝像頭的視頻，將文字寫在它上面，並保存到磁盤。但是，我似乎無法使其工作或視頻在VLC中播放。在OpenCV中保存帶有文字覆蓋的視頻

下面是嘗試所有的編解碼器/外延式的組合，這是我運行腳本，打反覆ESC，看是否在的VLC作品，並重復每個組合，直到腳本退出：

import cv2 
import os 

extensions = ['avi', 'mp4'] 
codecs = ['MJPG', 'H264', 'DIVX', 'XVID', 'X264'] 

for ext in extensions: 
    for codec in codecs: 
     savepath = "output__%s.%s" % (codec, ext) 

     try: 
      # setup up our webcam to read frames 
      cap = cv2.VideoCapture(0) 
      cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920) 
      cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080) 

      # and our buffer to write frames 
      fourcc = cv2.VideoWriter_fourcc(*codec) 
      out = cv2.VideoWriter(savepath, fourcc, 20.0, (1080, 1920), 1) 

      while True: 
       ret, frame = cap.read() 
       text = 'testing 123' 
       font = cv2.FONT_HERSHEY_SIMPLEX 
       cv2.putText(frame, text, (50, 50), font, 2, (255, 255, 0), 2) 

       # write our frame 
       out.write(frame) 

       cv2.imshow('My Frame', frame) 
       ch = cv2.waitKey(1) 
       if ch == 27: # ESC 
        break 


      cap.release() 
      out.release() 
      cv2.destroyAllWindows() 

      os.system("vlc %s" % savepath) 

     except Exception as e: 
      print "Combo codec=%s, exte=%s failed with: %s" % (codec, ext, str(e))

結果運行此腳本：

$ python test.py 
OpenCV Error: Assertion failed (img.cols == width && img.rows == height && channels == 3) in write, file /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_mjpeg_encoder.cpp, line 829 
Combo codec=MJPG, exte=avi failed with: /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_mjpeg_encoder.cpp:829: error: (-215) img.cols == width && img.rows == height && channels == 3 in function write 

VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV 
Unable to stop the stream: Device or resource busy 
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /home/me/code/myproject/OpenCV-3.2.0/modules/highgui/src/window.cpp, line 312 
Combo codec=H264, exte=avi failed with: /home/me/code/myproject/OpenCV-3.2.0/modules/highgui/src/window.cpp:312: error: (-215) size.width>0 && size.height>0 in function imshow 

init done 
opengl support available 

For codec=DIVX, extension=avi 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[0000000001f0e148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007eff1cc017d8] avi demux error: no key frame set for track 0 
QObject::~QObject: Timers cannot be stopped from another thread 

For codec=XVID, extension=avi 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[00000000022b8148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007f9c14c017d8] avi demux error: no key frame set for track 0 
QObject::~QObject: Timers cannot be stopped from another thread 

For codec=X264, extension=avi 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[0000000001a55148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007f485cc017d8] avi demux error: no key frame set for track 0 
QObject::~QObject: Timers cannot be stopped from another thread 
OpenCV: FFMPEG: tag 0x47504a4d/'MJPG' is not supported with codec id 8 and format 'mp4/MP4 (MPEG-4 Part 14)' 
OpenCV: FFMPEG: fallback to use tag 0x0000006c/'l???' 

For codec=MJPG, extension=mp4 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[0000000000e53148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007f02a8c017d8] mp4 demux error: cannot find any /moov/trak 
QObject::~QObject: Timers cannot be stopped from another thread 
OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 28 and format 'mp4/MP4 (MPEG-4 Part 14)' 
OpenCV: FFMPEG: fallback to use tag 0x00000021/'!???' 

For codec=H264, extension=mp4 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[00000000015f8148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007f6994c01838] mp4 demux error: cannot find any /moov/trak 
QObject::~QObject: Timers cannot be stopped from another thread 
OpenCV: FFMPEG: tag 0x58564944/'DIVX' is not supported with codec id 13 and format 'mp4/MP4 (MPEG-4 Part 14)' 
OpenCV: FFMPEG: fallback to use tag 0x00000020/' ???' 

For codec=DIVX, extension=mp4 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[0000000001880148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007f21acc017d8] mp4 demux error: cannot find any /moov/trak 
QObject::~QObject: Timers cannot be stopped from another thread 
OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 13 and format 'mp4/MP4 (MPEG-4 Part 14)' 
OpenCV: FFMPEG: fallback to use tag 0x00000020/' ???' 

For codec=XVID, extension=mp4 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[000000000178c148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007f1e64c01858] mp4 demux error: cannot find any /moov/trak 
QObject::~QObject: Timers cannot be stopped from another thread 
OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 28 and format 'mp4/MP4 (MPEG-4 Part 14)' 
OpenCV: FFMPEG: fallback to use tag 0x00000021/'!???' 

For codec=X264, extension=mp4 
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80) 
[0000000000baa148] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. 
[00007fdcc8c01838] mp4 demux error: cannot find any /moov/trak 
QObject::~QObject: Timers cannot be stopped from another thread

我試圖擴展名（.AVI，.MP4）和編解碼器的每個組合（MJPG，DIVX，XVID，H264），並沒有任何影片的播放。

任何想法有什麼不對？

來源

2017-07-18 lollercoaster

繼討論https://github.com/ContinuumIO/anaconda-issues/issues/223。我採用了jeremy-rutman的建議「我可以通過保持輸出視頻尺寸與輸入框架尺寸一致來解決這個問題。」

以下代碼適用於我，我使用int(cap.get(3))int(cap.get(4))作爲框架大小。（我的API也有點不同，像fourcc檢索），也waitKey不適合我，所以我只是循環多達100.

import cv2 
import os 

extensions = ['avi','mp4'] 
codecs = ['MJPG','H264', 'DIVX', 'XVID', 'X264'] 

for ext in extensions: 
    for codec in codecs: 
     savepath = "output__%s.%s" % (codec, ext) 
     print savepath 
     try:   
      cap = cv2.VideoCapture(0) 

      # and our buffer to write frames 
      fourcc = cv2.cv.CV_FOURCC(*codec) 
      out = cv2.VideoWriter(savepath, fourcc, 20.0,  (int(cap.get(3)),int(cap.get(4))), 1) 
      i = 0; 
      while i < 100: 
       i = i +1 

       ret, frame = cap.read() 
       if not ret: 
        continue 

       text = 'testing 123' 
       font = cv2.FONT_HERSHEY_SIMPLEX 
       cv2.putText(frame, text, (50, 50), font, 2, (255, 255, 0), 2) 

       #write our frame 
       out.write(frame) 

       cv2.imshow('My Frame', frame) 
       ch = cv2.waitKey(1) 
       if ch == 27: # ESC 
        break 

      cap.release() 
      out.release() 
      cv2.destroyAllWindows() 

      os.system("vlc %s" % savepath) 

    except Exception as e: 
     print "Combo codec=%s, exte=%s failed with: %s" % (codec, ext, str(e))

來源

2017-08-07 03:18:00 dafnahaktana

在OpenCV中保存帶有文字覆蓋的視頻

回答

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