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• usb_fill_bulk_urb with less buffer_length gives no garbage Transport stream data

  4 février 2015, par user3570793

  Currently I am working on a DVB-T2 dongle which is connected to my Ubuntu laptop 14.04 using USB

  interface.

  I am using following applications to perform scanning and channel play.
  1. w_scan - which scans and gives me a channel.conf file
  2. vlc ./channel.conf - plays a channel using modulation parameters in channel.conf

  Things work fine when Pid filtering is disabled. But when Pid filtering is enabled, I see

  macroblocks on the screen instead of smooth AV. Even AV is breaking a lot.

  After going through the driver code, I tried increasing the URB buffer size from 3K (21*188) to

  64K (348*188). The AV became smooth.

  This urb buffer size is buffer_length (lenght of transport buffer) in below function.

  void usb_fill_bulk_urb (struct urb * urb, struct usb_device * dev,
  unsigned int pipe, void * transfer_buffer,
  int buffer_length, usb_complete_t complete_fn,
  void * context) ;

  As you can see the driver uses bulk mode of usb transfer.

  Could anyone explain me why increasing the buffer is solving the macroblock issue ?

  Give me some pointers to understand this issue better.

  Thanks in advance,
  Murali

• About Soundcloud scraping for uploading music to telegram group

  16 juin 2021, par so sa

  I am trying to automatically download the new uploaded file from the below soundcloud link and upload it to a telegram group :

  


  https://soundcloud.com/radio-hamrah-1

  


  so I have googled the :

  


  


  python script to download from soundcloud and import to telegram
group

  


  


  and tried the scdl python module by its instruction, but when I have tried its on this colab page I get this error :

  


  !pip3 install git+https://github.com/flyingrub/scdl
!scdl -l https://soundcloud.com/pandadub/sets/the-lost-ship --download-archive archive.txt -c

Collecting git+https://github.com/flyingrub/scdl
  Cloning https://github.com/flyingrub/scdl to /tmp/pip-req-build-0g64ql2f
  Running command git clone -q https://github.com/flyingrub/scdl /tmp/pip-req-build-0g64ql2f
Requirement already satisfied (use --upgrade to upgrade): scdl==1.6.12 from git+https://github.com/flyingrub/scdl in /usr/local/lib/python3.7/dist-packages
Requirement already satisfied: docopt in /usr/local/lib/python3.7/dist-packages (from scdl==1.6.12) (0.6.2)
Requirement already satisfied: mutagen in /usr/local/lib/python3.7/dist-packages (from scdl==1.6.12) (1.45.1)
Requirement already satisfied: termcolor in /usr/local/lib/python3.7/dist-packages (from scdl==1.6.12) (1.1.0)
Requirement already satisfied: requests in /usr/local/lib/python3.7/dist-packages (from scdl==1.6.12) (2.23.0)
Requirement already satisfied: clint in /usr/local/lib/python3.7/dist-packages (from scdl==1.6.12) (0.5.1)
Requirement already satisfied: chardet<4,>=3.0.2 in /usr/local/lib/python3.7/dist-packages (from requests->scdl==1.6.12) (3.0.4)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in /usr/local/lib/python3.7/dist-packages (from requests->scdl==1.6.12) (1.24.3)
Requirement already satisfied: idna<3,>=2.5 in /usr/local/lib/python3.7/dist-packages (from requests->scdl==1.6.12) (2.10)
Requirement already satisfied: certifi>=2017.4.17 in /usr/local/lib/python3.7/dist-packages (from requests->scdl==1.6.12) (2021.5.30)
Requirement already satisfied: args in /usr/local/lib/python3.7/dist-packages (from clint->scdl==1.6.12) (0.1.0)
Building wheels for collected packages: scdl
  Building wheel for scdl (setup.py) ... done
  Created wheel for scdl: filename=scdl-1.6.12-cp37-none-any.whl size=19143 sha256=27ca560a7f3947830289d0df167db84137d1554fe1ab740c2afab3db0abedd74
  Stored in directory: /tmp/pip-ephem-wheel-cache-agspvyq5/wheels/49/44/6e/a5f6f709e7b231f3639ea9f9fc48a4699b958850715556e7f6
Successfully built scdl
Soundcloud Downloader
Failed to get item...


  


  

  


  and when I try by the Docker VPS by this commands :

  


  pip3 install git+https://github.com/flyingrub/scdl
pip3 install ffmpeg
scdl -l https://soundcloud.com/pandadub/sets/the-lost-ship --download-archive archive.txt -c


  


  pip3 install git+https://github.com/flyingrub/scdl pip3 install ffmpeg
scdl -l https://soundcloud.com/pandadub/sets/the-lost-ship —download-archive archive.txt -c

  


  I get this error :

  


  FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg'


  


  

  


  So I asked abut how could i do it by scdl and soundcloude python module.

  


  Update :

  


  Based of my two comment on this question I get different result by using the scdl python module via the above colab page, sometimes it is working and sometimes not, which i guess it is because of soudncloud server setting for preventing huge scraping and needs some delay during the music scraping form the soundcloud.

  


  Thanks.

  


• Merge commit ’4fef648d10bf3bcfd4b8fa5755c1128966a2427c’

  15 mars 2017, par Clément Bœsch

  Merge commit ’4fef648d10bf3bcfd4b8fa5755c1128966a2427c’
  * commit ’4fef648d10bf3bcfd4b8fa5755c1128966a2427c’ :
  
    Remove the legacy X11 screen grabber
  Merged-by : Clément Bœsch <u@pkh.me>
  

  • [DH] Changelog
  • [DH] LICENSE.md
  • [DH] configure
  • [DH] libavdevice/Makefile
  • [DH] libavdevice/alldevices.c
  • [DH] libavdevice/avdevice.h
  • [DH] libavdevice/x11grab.c