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• How to append an image to a video using OpenCV or FFMPEG or Moviepy or other libraries ?

  19 juillet 2022, par Trần Tiến Văn

  Do you know a library in Python to add a frame image to an existing video ? The result video must have the same quality as the image.

  


  I tried to use OpenCV to add google image : https://www.google.com/search?q=google&sxsrf=ALiCzsZhrdoHnOTmg0We4dxtguCqzma5Jg:1657603343101&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiTh8bTzfL4AhWhplYBHfXNAKwQ_AUoAXoECAIQAw&biw=1492&bih=739&dpr=1.25#imgrc=PRtenhDnrVrfOM

  


  But the quality decreases when the video elongates.

  


  Here is the final result video : https://drive.google.com/file/d/1ArDvoX-kN9H_oLbACk3kU1Cid93SMczC/view?usp=sharing

  


  Here is my code using OpenCV :

  


          image = cv2.imread(path_image)
        height, width, dimensions = image.shape
            
        video = cv2.VideoCapture(path_video)
        
        
        frames = []
        while(True):
            
            ret, frame = video.read()
            
            if ret == True: 
                frames.append(frame)
                # frame = frame.resize(frame, (width, height), fx=0, fy=0, interpolation = cv2.INTER_CUBIC)
                
                # Press S on keyboard 
                # to stop the process
                if cv2.waitKey(1) & 0xFF == ord('s'):
                    break
            # Break the loop
            else:
                break
            
        video2 = cv2.VideoWriter(path_video,cv2.VideoWriter_fourcc('M','J','P','G'), 30, (width, height))
        for frame in frames:
            video2.write(frame)
        video2.write(image)
        video2.release()  # releasing the video generated     
        print("Added {}".format(image_name))


  


  I hope to improve the quality of this video.

  


• OpenCV : FFMPEG : tag is not supported with codec id 12 and format 'mp4 / MP4

  30 septembre 2023, par Tina J

  I was trying to run a repo located HERE. Basically, just targeting SimpleVideoSummarizer.cc which uses OpenCV for some basic video processing. I'm using Ubuntu 14.04. Following is the save part of the code :

  



  void SimpleVideoSummarizer::playAndSaveSummaryVideo(char* videoFileSave) {&#xA;    cv::VideoCapture capture(videoFile);&#xA;    cv::Mat frame;&#xA;    capture.set(CV_CAP_PROP_POS_FRAMES, 0);&#xA;    cv::VideoWriter videoWriter;&#xA;    if (videoFileSave != "") {&#xA;        videoWriter = cv::VideoWriter(videoFileSave, CV_FOURCC(&#x27;M&#x27;, &#x27;J&#x27;, &#x27;P&#x27;, &#x27;G&#x27;), static_cast<int>(capture.get(CV_CAP_PROP_FPS)), cv::Size(capture.get(CV_CAP_PROP_FRAME_WIDTH), capture.get(CV_CAP_PROP_FRAME_HEIGHT)));&#xA;    }&#xA;    for (std::set<int>::iterator it = summarySet.begin(); it != summarySet.end(); it&#x2B;&#x2B;) {&#xA;        capture.set(CV_CAP_PROP_POS_FRAMES, segmentStartTimes[*it] * frameRate);&#xA;        for (int i = segmentStartTimes[*it]; i &lt; segmentStartTimes[*it &#x2B; 1]; i&#x2B;&#x2B;) {&#xA;            for (int j = 0; j &lt; frameRate; j&#x2B;&#x2B;) {&#xA;                capture >> frame;&#xA;                cv::putText(frame, "Time: " &#x2B; IntToString(i) &#x2B; " seconds", cvPoint(30, 30),&#xA;                            cv::FONT_HERSHEY_COMPLEX_SMALL, 0.8, cvScalar(200, 200, 250), 1, CV_AA);&#xA;                if (frame.data) {&#xA;                    cv::imshow("Summary Video", frame);&#xA;                }&#xA;                if (videoFileSave != "") {&#xA;                    videoWriter.write(frame);&#xA;                }&#xA;                // Press  ESC on keyboard to exit&#xA;                char c = static_cast<char>(cv::waitKey(25));&#xA;                if (c == 27) {&#xA;                    break;&#xA;                }&#xA;            }&#xA;        }&#xA;    }&#xA;    capture.release();&#xA;}&#xA;</char></int></int>

  



  I pass an input.mp4 file and specify a out.mp4 as well. Unfortunately, when the example is trying to save the output video file, it throws errors on the FOURCC :

  



  OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 12 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'


  



  or another one :

  



  OpenCV: FFMPEG: tag 0x3234504d/'MP42' is not supported with codec id 15 and format 'mp4 / MP4 (MPEG-4 Part 14)'
[mp4 @ 0x16bc700] Could not find tag for codec msmpeg4v2 in stream #0, codec not currently supported in container


  



  I tried to change the FOURCC in this part of the code which writes the video, and applied XVID, MJPG, X264, MP42, MP4V. None worked and threw similar errors.

  



  What is the problem ? How to fix it ?

  


• Why am I having issues re-encoding rtsp stream to rtmp via FFMPEG-python ? [closed]

  27 août 2023, par Luke Lopez

  I can see that the python script is not throwing errors however I cant stream the video via VLC player.

  


  
  Metadata:
    title           : Media Server
    encoder         : Lavf60.3.100
  Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p(tv, progressive), 640x360, q=2-31, 1 kb/s, 25 fps, 1k tbn
    Metadata:
      encoder         : Lavc60.3.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/1000 buffer size: 0 vbv_delay: N/A
frame= 1927 fps= 25 q=69.0 size=      92kB time=00:01:17.00 bitrate=   9.7kbits/s dup=13 drop=1 speed=0.98x     



import subprocess

# Input RTSP stream URL
input_stream_url = "rtsp://myStream"

# Wowza RTMP or RTSP URL (replace with your Wowza server's details)
wowza_url = "rtmp://myWowzaServer"

# Resolution 
desired_width = 640
desired_height = 360

# Video bitrate and frame rate settings
video_bitrate = "1240"  # 1240 Kbps
fps = 25

# Start FFmpeg process to pull and push the stream with specified settings
ffmpeg_command = [
    'ffmpeg',
    '-rtsp_transport', 'tcp',  # Use TCP for RTSP transport (optional)
    '-i', input_stream_url,    # Input RTSP stream URL
    '-s', f'{desired_width}x{desired_height}',  # Desired resolution
    '-c:v', 'libx264',        # Video codec: H.264
    '-b:v', video_bitrate,    # Video bitrate
    '-r', str(fps),            # Frame rate
    '-c:a', 'aac',            # Audio codec: AAC
    '-f', 'flv',              # Output format (FLV for RTMP, rtsp for RTSP)
    wowza_url                 # Wowza RTMP or RTSP URL
]

# Start FFmpeg as a subprocess
ffmpeg_process = subprocess.Popen(ffmpeg_command)

# Stop Condition
print("Press Enter to stop...")
input()

# Terminate FFmpeg when done
ffmpeg_process.terminate()



  


  So far I have tried implementing best encoding practices as recommended by Wowza, have been messing with the frame rate, bitrate etc... but with no luck. Hopefully someone experienced with using FFMpeg can give suggestions / solutions ??

  


  Thanks !