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• LibAV dealing with 'moov' atom at the end of the file

  12 septembre 2018, par thepros

  I am trying to figure out how to use libav to receive streaming mp4 that contains moov atom at the end of a file. I found that, libav has problems decoding such files from https://d.tube. To identify this problem, I have used AtomicParsley to see the position of moovatom. Furthermore, I have tested with qt-faststart. The problematic files processed with qt-faststart have no problem with libav at all.

  I also looked into how browsers handle this kind of file as mentioned in how HTML5 video handle video with moov atom at the end. I tried download the first and the last chunk of a file to check first before streaming, but avformat_open_input() cannot open only the last chunk of the file. I think it needs some information from other atoms as well.

  So, I would like to ask if anyone knows that libav can somehow handle this problem.

• Python, how use threading to run multiple FFmpeg processes in same time [duplicate]

  3 septembre 2022, par Marcin Kamienski

  I'm new to threading, I'm building icecast2 radio station which will restream existing stations in lower quality

  


  import ffmpeg, csv
from threading import Thread

def run(name, mount, source):
    icecast = "icecast://"+ICECAST2_USER+":"+ICECAST2_PASS+"@localhost:"+ICECAST2_PORT+"/"+mount
    stream = (
            ffmpeg
            .input(source)
            .output(
                icecast,
                audio_bitrate=BITRATE, sample_rate=SAMPLE_RATE, format=FORMAT, acodec=CODEC,
                reconnect="1", reconnect_streamed="1", reconnect_at_eof="1", reconnect_delay_max="120",
                ice_name=name, ice_genre=source,
                loglevel="verbose"
                )
            )
    return stream

with open('stations.csv', mode='r') as data:
    for station in csv.DictReader(data):
        stream = run(station['name'], station['mount'], station['url'])
        thread = Thread(target=stream.run())
        thread.start()


  


  

  1. In stations.csv are 2 stations, this code start only first station from the list, probably waiting for proccess to finish before it will start 2nd. When I change the way FFmpeg is running stream.run_async() then both stations are playing, but I'm losing control over them and stopping python didn't stop FFmpeg processes.

  


  2. How can I redirect output of each thread separately in a way that gives me live view on what's going on right now ?

  


  


  Edit
python threading blocks
answer question 1 but i'm still looking for solution on question 2

  


• Revision 79003 : Pipeline "afficher_contenu_objet" : prendre en compte le cas où ...

  30 novembre 2013, par tcharlss@… — Log

  Pipeline "afficher_contenu_objet" : prendre en compte le cas où l’identifiant de l’objet n’est pas donné par $fluxargs ?id_objet ? mais par $fluxargs ?contexte ?id ?.
  Problème constaté sur la fiche d’une commande.
  ps : De plus, l’exemple du site ​http://programmer.spip.net/afficher_contenu_objet,434 récupère l’identifiant avec $fluxargs ?id ?…