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-
.mp4 file is not playing in Django template and FireFox or Chrome
9 février 2021, par Himanshu sharmaI can save live RTSP video stream in .mp4 but when I run saved .mp4 video in Django template or Firefox or Chrome browser or VLC, video is not playing in ubuntu.
I think I have a compatible issue problem in .mp4. Furthermore, I want to show and play .mp4 saved file in Django.


I have a two IP camera which provides a live RTSP video stream.


self.input_stream---> rtsp://admin:Admin123@192.168.1.208/user=admin_password=Admin123_channel=0channel_number_stream=0.sdp

self.input_stream---> rtsp://Admin:@192.168.1.209/user=Admin_password=_channel=0channel_number_stream=0.sdp


Python 3.8.5 (default, Jul 28 2020, 12:59:40)
[GCC 9.3.0] on linux,


Django==3.1.2


I am implementing this code in difference Ubuntu PCs


Ubuntu = 18.04 and 20.04


opencv-contrib-python==4.4.0.46


opencv-python==4.4.0.46


ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)


I had tried different fourcc to save .mp4 but below fourcc work perfectly in Ubuntu.


fourcc = cv2.VideoWriter_fourcc(*'mp4v')


class ffmpegStratStreaming(threading.Thread):
 def __init__(self, input_stream=None, output_stream=None, camera=None, *args, **kwargs):
 self.input_stream = input_stream
 self.output_stream = output_stream
 self.camera = camera
 super().__init__(*args, **kwargs)

 def run(self):
 try:vs = cv2.VideoCapture(self.input_stream)
 fps_rate = int(vs.get(cv2.CAP_PROP_FPS))
 ##############################
 ############################## 
 # ~ print('fps rate-->', fps_rate,'camera id-->' ,str(self.camera.id))
 # ~ vs.set(cv2.CAP_PROP_POS_FRAMES,50) #Set the frame number to be obtained
 # ~ print('fps rate-->', fps_rate,'camera id-->' ,str(self.camera.id),' ####### ')
 
 # initialize the video writer (we'll instantiate later if need be)
 writer = None

 # initialize the frame dimensions (we'll set them as soon as we read
 # the first frame from the video)
 W = None
 H = None 
 # start the frames per second throughput estimator
 fps = FPS().start()

 # saving frame in avi video format
 video_file_count = 0
 start_time = time.time()

 while True:
 try:
 # grab the next frame and handle if we are reading from either
 # VideoCapture or VideoStream
 
 frame_init = vs.read()
 frame = frame_init[1] if self.input_stream else frame_init
 
 # if frame is can't read correctly ret is False
 while frame_init[0] == False:
 print("Can't receive frame. Retrying ...")
 vs.release()
 vs = cv2.VideoCapture(self.input_stream) 
 frame_init = vs.read()
 frame = frame_init[1] if self.input_stream else frame_init

 # if we are viewing a video and we did not grab a frame then we
 # have reached the end of the video
 if self.input_stream is not None and frame is None:
 break

 # resize the frame to have a maximum width of 500 pixels (the
 # less data we have, the faster we can process it), then convert
 # the frame from BGR to RGB for dlib
 frame = imutils.resize(frame, width=500) 
 
 
 #<---------------------- Start of writing a video to disk -------------------------> 
 minute = 1
 second = 60
 minite_to_save_video = int(minute) * int(second)

 
 # if we are supposed to be writing a video to disk, initialize
 if time.time() - start_time >= minite_to_save_video or video_file_count == 0 :
 ## where H = heigth, W = width, C = channel 
 H, W, C = frame.shape
 video_file_count += 1
 start_time = time.time()
 output_save_directory = self.output_stream+str(video_file_count)+'.mp4'
 # fourcc = cv2.VideoWriter_fourcc(*"MJPG")
 # fourcc = cv2.VideoWriter_fourcc(*'XVID')
 # fourcc = cv2.VideoWriter_fourcc(*'X264')
 # fourcc = cv2.VideoWriter_fourcc(*'MP4V')

 
 # fourcc = cv2.VideoWriter_fourcc(*'FMP4')

 # fourcc = cv2.VideoWriter_fourcc(*'avc1')


 # fourcc = cv2.VideoWriter_fourcc('M','J','P','G')

 fourcc = cv2.VideoWriter_fourcc(*'mp4v')
 # fourcc = cv2.VideoWriter_fourcc(*'mp3v')
 # fourcc = 0x00000021
 print(fourcc, type(fourcc),'ffffffff')
 # a = int(vs.get(cv2.CAP_PROP_FOURCC))
 # print(a,type(a),' aaaaaaaa' )

 # writer = skvideo.io.FFmpegWriter(output_save_directory, outputdict={
 # '-vcodec': 'libx264', '-b': '300000000'
 # })
 
 # writer = skvideo.io.FFmpegWriter(self.output_stream, outputdict={'-r': '120', '-c:v': 'libx264', '-crf': '0', '-preset': 'ultrafast', '-pix_fmt': 'yuv444p'})
 
 writer = cv2.VideoWriter(output_save_directory, fourcc ,20.0,( int(W), int(H) ), True)
 
 
 # ~ The cv2.VideoWriter requires five parameters: 

 # check to see if we should write the frame to disk
 if writer is not None: 
 try:
 writer.write(frame)
 except Exception as e:
 print('Error in writing video output---> ', e)
 
 #<---------------------- end of writing a video to disk ------------------------->

 # show the output frame
 # cv2.imshow("Frame", frame)
 # key = cv2.waitKey(1) & 0xFF

 # if the `q` key was pressed, break from the loop
 # if key == ord("q"):
 # break

 # increment the total number of frames processed thus far and
 # then update the FPS counter
 totalFrames += 1
 fps.update()
 except Exception as e:
 print('Error in main while loop--> ', e)

 # stop the timer and display FPS information
 fps.stop()

 # check to see if we need to release the video writer pointer
 # if writer is not None:
 # writer.release()

 # if we are not using a video file, stop the camera video stream
 # if not self.input_stream:
 # vs.stop()

 # otherwise, release the video file pointer
 # else:
 # vs.release()

 # close any open windows
 # cv2.destroyAllWindows()
 except Exception as e:
 print(e, '333333333333333333333333333')


My Django template code


{% block main %}
<div class="row">
 {% if folders|length == 0 %}
 <div class="col-md-12 text-center">
 <h6 class="card-title">There are no files in this directory.</h6>
 </div>
 {% else %}
 {% for folder in folders %}
 <div class="col-md-3 text-center">
 <div class="card-block">
 <video class="video-js vjs-fluid vjs-default-skin" controls="controls" preload="auto" muted="muted" data-setup="'{" true="true"></video>
 <source src="{% get_media_prefix %}camera-feed/video-saved/{{pk}}/{{parent}}/{{folder}}" type="video/mp4">
 
 <h6 class="card-title">{{folder}}</h6>
 </source></div>
 </div>
 {% endfor %}
 {% endif %}
</div>
{% endblock %}


Function in view.py to see saved .mp4 video in Django template. Video is saved at local folder.


def CameraVideos(request, pk, folder):
 dirpath = settings.MEDIA_ROOT + '/camera-feed/video-saved/' + str(pk) + '/' + folder
 folders = sorted(Path(dirpath).iterdir(), key=os.path.getmtime)
 data = []
 for file in folders:
 if not file.name.startswith('.'):
 data.append(file.name)
 return render(request, "home/camera_video.html", {'folders': data, 'pk': pk, 'parent': folder})


-
When I append a silent audio (mp3) to an existing list of audio it garbles the final audio ?
6 février 2020, par MarieAfter several hours I have narrowed down the issue with the garbled audio to be the 2-seconds silence audio mp3 I am appending (I think I had produced it once with Wavelab)
However, I tried using ffmpeg according to a post to produce a similar 2 seconds audio but it too will corrupt/garble/chop voice in the final concatenation of audio files.
ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t 2 -q:a 9 -acodec libmp3lame SILENCE_2sec.MP3I typically will have several audio files to concatenate together but for simplicity I have able to narrow it to a couple of files simplifying to the following script. A simple Windows batch file you should be able to use and reproduce the issue at your end.
rem
rem
SET EXE="S:\_BINS\FFmpeg 4.2.1 20200112\bin\ffmpeg.exe"
SET ROOTPATH=.\
SET IN_FILE="%ROOTPATH%MyList.txt"
ECHO file '%ROOTPATH%HELLO.mp3' > MyList.txt
ECHO file 'SILENCE_2sec.MP3' >> MyList.txt
SET OPTIONS= -f concat -safe 0 -i %IN_FILE% -c copy -y
SET OUT_FILE="%ROOTPATH%CONCATENATED_AUDIO_2.MP3"
SET INFO_FILE="INFO.TXT"
%EXE% %OPTIONS% %OUT_FILE% 1> %INFO_FILE% 2>&1
ECHO ======================== >> %INFO_FILE%
ECHO IN_FILE=%IN_FILE% >> %INFO_FILE%
ECHO EXE=%EXE% >> %INFO_FILE%
ECHO OPTIONS=%OPTIONS% >> %INFO_FILE%
ECHO ======================== >> %INFO_FILE%Here is the console info output from the ffmpeg, let me know if you need other output include ones from ffprobe
ffmpeg version git-2020-01-10-3d894db Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20191125
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.103 / 58. 65.103
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 70.101 / 7. 70.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
[mp3 @ 000000000036af80] Estimating duration from bitrate, this may be inaccurate
Input #0, concat, from '.\MyList.txt':
Duration: N/A, start: 0.000000, bitrate: 32 kb/s
Stream #0:0: Audio: mp3, 24000 Hz, mono, fltp, 32 kb/s
Output #0, mp3, to '.\CONCATENATED_AUDIO_2.MP3':
Metadata:
TSSE : Lavf58.35.101
Stream #0:0: Audio: mp3, 24000 Hz, mono, fltp, 32 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp3 @ 0000000000372d00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 17280 >= 17255
size= 11kB time=00:00:02.73 bitrate= 33.2kbits/s speed=2.73e+03x
video:0kB audio:11kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.137446%
========================
IN_FILE=".\MyList.txt"
EXE="S:\_BINS\FFmpeg 4.2.1 20200112\bin\ffmpeg.exe"
OPTIONS= -f concat -safe 0 -i ".\MyList.txt" -c copy -y
========================I believe I am running FFmpeg 4.2.1, recently installed (20200112)
You may produce the HELLO.mp3 by saving the following link
https://translate.google.com.vn/translate_tts?en=UTF-8&q=Hello+&tl=en&client=tw-obFYI, I am still a novice of ffmpeg and using it more like a black box with the help I received in this very super forum.
Please be as explicit as you can with command line options on how I can fix this issue.
Thank you.Additional Hints Debugging :
If I append more files after the silence audio it seems that the silence audio impacts (garbles, chops) the previous audio.
You may try the following for the list of audio files input.ECHO file '%ROOTPATH%HELLO.mp3' > MyList.txt
ECHO file 'SILENCE_2sec.MP3' >> MyList.txt
ECHO file '%ROOTPATH%HELLO.mp3' >> MyList.txt
ECHO file '%ROOTPATH%HELLO.mp3' >> MyList.txtI typically add one or more silence file to derive a post silence effect after the actual audio. That’s my current logic. However if you have an alternative to appending a silence in the process of concatenating several audio files or appending x-seconds silence to an existing audio file. I can use that method as well from my coding.
Thank you.
-
How to concatenate 3 mp4 files using ffmpeg (facing error in resultant video) ?
5 février 2021, par Mayank ThapliyalI have 3 videos of mp4 format. They have same resolution (640 X 1280) but other properties like frame rate etc are different. I want to join them back to back.So I gave a check on internet and I used the following method


:: Create File List
echo file file1.mp4 > mylist.txt 
echo file file2.mp4 >> mylist.txt
echo file file3.mp4 >> mylist.txt

:: Concatenate Files
ffmpeg -f concat -i mylist.txt -c copy output.mp4


But unfortunately it did not worked.In the resultant video, file1 part got freezed, and audio of whole video shifted (no idea how).And other methods are also not working properly


I just want to join them back to back.Any idea how to do it ?


Edit :- I gave a check on the output of the ffmpeg (using pause command in bat and discovered the following. Maybe it may help regarding the issue)


C:\Users\Cascade_Games\Desktop\Cascade Empire\ffmpeg-4.3.1-2020-10-01-full_build\bin>ffmpeg -f concat -i mylist.txt -vcodec copy -acodec copy Mux1.mp4
ffmpeg version 4.3.1-2020-10-01-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002a0474e6a40] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'mylist.txt':
 Duration: N/A, start: -0.023220, bitrate: 2447 kb/s
 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x640 [SAR 1:1 DAR 2:1], 2320 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
 Metadata:
 handler_name : VideoHandle
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s
 Metadata:
 handler_name : SoundHandler
Output #0, mp4, to 'Mux1.mp4':
 Metadata:
 encoder : Lavf58.45.100
 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x640 [SAR 1:1 DAR 2:1], q=2-31, 2320 kb/s, 30 fps, 30 tbr, 15360 tbn, 15360 tbc
 Metadata:
 handler_name : VideoHandle
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s
 Metadata:
 handler_name : SoundHandler
Stream mapping:
 Stream #0:0 -> #0:0 (copy)
 Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002a04750d700] Auto-inserting h264_mp4toannexb bitstream filter
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002a0474ef040] Auto-inserting h264_mp4toannexb bitstream filter
[mp4 @ 000002a0478e09c0] Non-monotonous DTS in output stream 0:1; previous: 30282976, current: 27826977; changing to 30282977. This may result in incorrect timestamps in the output file.
[mp4 @ 000002a0478e09c0] Non-monotonous DTS in output stream 0:1; previous: 30282977, current: 27828129; changing to 30282978. This may result in incorrect timestamps in the output file.
(Same Thing was getting repeated,hence I deleted it)
[mp4 @ 000002a0478e09c0] Non-monotonous DTS in output stream 0:1; previous: 30283209, current: 28095393; changing to 30283210. This may result in incorrect timestamps in the output file.
[mp4 @ 000002a0478e09c0] Non-monotonous DTS in output stream 0:1; previous: 30283210, current: 28096545; changing to 30283211. This may result in incorrect timestamps in the output file.
[mp4 @ 000002a0478e09c0] aac bitstream error
 Last message repeated 234 times
frame=18937 fps=11438 q=-1.0 Lsize= 49051kB time=00:11:26.69 bitrate= 585.2kbits/s speed= 415x
video:40720kB audio:7653kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.401324%


Edit :-
Info of all files (I have changed the video name to 1.mp4,2.mp4,3.mp4)


C:\Users\Cascade_Games\Desktop\Cascade Empire\ffmpeg-4.3.1-2020-10-01-full_build\bin>ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4
ffmpeg version 4.3.1-2020-10-01-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:05.27, start: 0.000000, bitrate: 2337 kb/s
 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x640 [SAR 1:1 DAR 2:1], 2320 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
 Metadata:
 handler_name : VideoHandle
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:10:25.70, start: 0.000000, bitrate: 616 kb/s
 Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x640 [SAR 1:1 DAR 2:1], 511 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s (default)
 Metadata:
 handler_name : SoundHandle
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '3.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:08.50, start: 0.000000, bitrate: 447 kb/s
 Stream #2:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 1280x640 [SAR 1:1 DAR 2:1], 228 kb/s, 2 fps, 2 tbr, 16384 tbn, 4 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #2:1(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 319 kb/s (default)
 Metadata:
 handler_name : SoundHandler


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