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• FFMPEG command for video and audio

  19 mai 2012, par StackOverflowNewbie

  I'm not building the next YouTube or iTunes, but I do need to give my users the ability to upload their videos and audios — then present it on the web at the highest possible quality with the lowest possible file size.

  Questions :

  1. FOR INPUT : What video and audio formats should I support ? I'm guessing I should try to support the most common formats, but I'm not entirely sure what they are. Also, I'm not sure if I should support the most common formats. Maybe there is a reason not to support a certain format.

  2. FOR OUTPUT : What video and audio output formats should I generate ? I'd like to use HTML5's and tags, but know I should consider supporting non-HTML5 browsers. Should I do OGG, MP4 and FLV for videos ? What about audios ?

  3. Given an unknown video and audio file uploaded by the user, what command should I use to generate the desired output formats. I'd like one command to convert to particular outputs — and hopefully not have to do anything different to the commands depending on the input (it'll be a pain for me to know what the MIME type is of the file, etc. and can't really do an "if input is a WMV, then run this command" logic).

  Suggestion FFMPEG experts ?

• asyncio.create_subprocess_shell error : Future exception was never retrieved - BrokenPipeError

  10 juin 2021, par Abdelmalek

  Whenever I use asyncio.create_subprocess_shell() with sp.communicate() I get this error at the end of my program.

  


  If I run multiple suprocesses using asyncio, the error would be print at the end for each one of them.

  


  Aulthough it doesn't affect my program, I want to find the source and fix the issue. Thanks for the help !

  


  Traceback :

  


  Future exception was never retrieved&#xA;future: <future finished="finished" exception="BrokenPipeError(32," pipe="pipe" has="has" been="been">&#xA;Traceback (most recent call last):&#xA;  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\subprocess.py", line 153, in _feed_stdin&#xA;    await self.stdin.drain()&#xA;  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\streams.py", line 387, in drain&#xA;    await self._protocol._drain_helper()&#xA;  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\streams.py", line 197, in _drain_helper&#xA;    await waiter&#xA;  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\proactor_events.py", line 379, in _loop_writing&#xA;    f.result()&#xA;  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\windows_events.py", line 812, in _poll&#xA;    value = callback(transferred, key, ov)&#xA;  File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\windows_events.py", line 538, in finish_send&#xA;    return ov.getresult()&#xA;BrokenPipeError: [WinError 109] The pipe has been ended&#xA;</future>

  


  Code :

  


  async def get(cs, url):
    async with cs.get(url) as r:
        b = b''
        while True:
            chunk = await r.content.read(4000000)
            b += chunk
            if not chunk:
                break
        
        if int(r.headers['content-length']) < 8000000:
            result = BytesIO(b)
            return [result, 'full']
        else:
            command = f"ffmpeg -y -i - -c:v copy -fs 8000000 -f matroska -"
            sp = await asyncio.create_subprocess_shell(command, stdin=asyncio.subprocess.PIPE,
                stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
            stdout, stderr = await sp.communicate(b)
            sp.wait()

            print(stderr.decode())
            print(len(stdout))
            output = str(stderr)
            index_d = output.find('Duration: ')
            index_t = output.rfind('time=')
            duration = await get_sec(output[index_d + 10:].split(",")[0])
            time_ = await get_sec(output[index_t + 5:].split(" ")[0])
            percentage = f"{round((time_ / duration) * 100)}%"

            result = BytesIO(stdout)
            return [result, 'preview', percentage]

async def main(urls):
    async with aiohttp.ClientSession() as cs:
            
        tasks = []
        for url in urls:
            task = asyncio.create_task(get(cs, url))
            tasks.append(task)
        
        results = []
        for task in tasks:
            result = await task
            results.append(result)
        
        return results

loop = asyncio.get_event_loop()
results = loop.run_until_complete(main(urls))


  


• Anomalie #3177 (Nouveau) : padding auto n’existe pas

  4 mars 2014, par b b

  On a une règle qui tente de coller la valeur auto en tant que padding dans la dist :

  http://zone.spip.org/trac/spip-zone/browser/_core_/plugins/dist/css/layout.css#L73

  Pourtant cette valeur n’est pas reconnue et ne semble pas être "valide", cf :

  padding : [ | ] 1,4

  https://developer.mozilla.org/fr/docs/CSS/padding

  Si ce n’est pas voulu il serait bon supprimer ce padding : auto !important ;