Python文件中的FFmpeg已存在错误

Question

I'm working on a project using python(3.6) and Django(2.0) in which i'm converting a video to mp4 if it's in any other formate.

Here's my code:

from views.py:

def generate_thumbnail(filename, thumb_name):
    print('func called')
    print(filename)
    video_input_path = os.path.join(filename)
    img_output_path = os.path.join(thumb_name)
    subprocess.call(['ffmpeg', '-i', video_input_path, '-ss', '00:00:00.000', 'vframes', '1', img_output_path])


def convert_to_mp4(video_name, only_name):
    os.popen(
        "ffmpeg -i '{input}' -ac 2 -b:v 2000k -c:a aac -c:v libx264 -b:a 160k -vprofile high -bf 0 -strict experimental -f mp4 '{output}.mp4'".format(
            input=video_name, output=only_name))
    return True


def perform_upload(video, thumbnail):
    print('vdieo name is: {}'.format(video))
    servise = discovery.build('storage', 'v1', credentials=credentials)
    bucket_name = 'test_bucket004'
    print('Uploading the video...')
    media = MediaFileUpload(video, chunksize=4149304, mimetype='video/mp4',
                            resumable=True)
    req = servise.objects().insert(
        bucket=bucket_name,
        name=str(video),
        media_body=media,
        body={"cacheControl": "public,max-age=31536000"},
        predefinedAcl='publicRead'
    )
    resp = None
    while resp is None:
        status, resp = req.next_chunk()
    print(resp)
    video_url = 'http://storage.googleapis.com/' + bucket_name + '/' + str(video)

    print('Uploading your thumbnail...')
    media = MediaFileUpload(thumbnail, chunksize=4149304, mimetype='image/jpeg',
                            resumable=True)
    req = servise.objects().insert(
        bucket=bucket_name,
        name=str(thumbnail),
        media_body=media,
        body={"cacheControl": "public,max-age=31536000"},
        predefinedAcl='publicRead'
    )
    resp = None
    while resp is None:
        status, resp = req.next_chunk()
    print(resp)
    thumb_url = 'https://storage.googleapis.com/' + bucket_name + '/' + str(thumbnail)

    return video_url, thumb_url


class VideoConverter(generics.ListCreateAPIView):
    def get(self, request, *args, **kwargs):
        return HttpResponse('Get request', status=200)

    def post(self, request, *args, **kwargs):
        serializer = VideoConverterSerializer(data=self.request.data)
        validation = serializer.is_valid()
        print(serializer.errors)
        if validation is True:
            url = request.POST.get('video_url')
            filename = url.split('/')
            filename = filename[-1]
            print(filename)
            ext = filename.split('.')
            print(ext[-1])
            only_name = ext[0]
            urllib.request.urlretrieve(url, filename)
            generate_thumbnail(filename, only_name + '_thumbnail.jpg')
            if ext == 'mp4':
                videourl, thumb_url = perform_upload(filename, only_name + '_thumbnail.jpg')
            else:
                conversion = convert_to_mp4(filename, only_name)
                if conversion is True:
                    videourl, thumb_url = perform_upload(only_name + '.mp4', only_name + '_thumbnail.jpg')

            return HttpResponse('Video url is: {}\n \nThumbnail url is: {}'.format(videourl, thumb_url))
        else:
            return HttpResponse('Not a valid request')

But when I pass it a video of Mp4 format it returns an error in the IDE console like this:

ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers built with Apple LLVM version 10.0.0 (clang-1000.10.43.1) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PHP_GCS.mp4': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: mp41mp42isom creation_time : 2018-08-03T13:08:04.000000Z Duration: 00:01:21.40, start: 0.000000, bitrate: 1584 kb/s Stream #0:0(und): V ideo: h264 (Main) (avc1 / 0x31637661), yuv420p, 1918x1078 [SAR 1:1 DAR 137:77], 1581 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default) Metadata: creation_time : 2018-08-03T13:08:04.000000Z handler_name : Core Media Video

File 'PHP_GCS.mp4' already exists. Overwrite ? [y/N]

and stop the execution here until I press the enter button.I'm really confused why this is happining because when the video is already mp4 i'm not using ffmpeg but only for thumbnail generaton.

What can be wrong here?

Thanks in advance!

Answer 1

I think you missed something in your code.

You Post handler in video converter has this code:

        ext = filename.split('.')
        print(ext[-1])
        only_name = ext[0]
        urllib.request.urlretrieve(url, filename)
        generate_thumbnail(filename, only_name + '_thumbnail.jpg')
        if ext == 'mp4': # mistake here

but you're not checking the correct part on your if statement.

You should write if ext[-1] == 'mp4' because right now you're comparing a list with a string which will always return false!

This might solve your problem and if not please let me know and I will update my answer accordingly.