Avatar for Username

ค้นหาฝ่ายสนับสนุน

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

เรียนรู้เพิ่มเติม

หัวข้อนี้ถูกเก็บถาวรแล้ว โปรดถามคำถามใหม่หากคุณต้องการความช่วยเหลือ

Is it possible to disable VP8 error concealment for WebRTC?

  • 2 การตอบกลับ
  • 1 คนมีปัญหานี้
  • 7 ครั้งที่ดู
  • ตอบกลับล่าสุดโดย Robert Kirnum

Robert Kirnum
Robert Kirnum
more options

Chrome appears to disable VP8 error concealment when rtcp-fb nack is negotiated when setting up a connection (SIP / SDP). I have not been able to get Firefox to disable error concealment. I am also unable get Firefox to enable rtcp-fb nack though I am not certain this will disable VP8 error concealment as on Chrome.

Chrome appears to disable VP8 error concealment when rtcp-fb nack is negotiated when setting up a connection (SIP / SDP). I have not been able to get Firefox to disable error concealment. I am also unable get Firefox to enable rtcp-fb nack though I am not certain this will disable VP8 error concealment as on Chrome.

วิธีแก้ปัญหาที่เลือก

From http://www.ietf.org/rfc/rfc2327.txt SDP: Session Description Protocol

6. SDP Specification

… 

  Text records such as the session name and information are bytes
  strings which may contain any byte with the exceptions of 0x00 (Nul),
  0x0a (ASCII newline) and 0x0d (ASCII carriage return).  The sequence
  CRLF (0x0d0a) is used to end a record, although parsers should be
  tolerant and also accept records terminated with a single newline
  character.  By default these byte strings contain ISO-10646
  characters in UTF-8 encoding, but this default may be changed using
  the `charset' attribute.

Looks like the Firefox SDP parser requires a carriage return ('\r'), it is unable to process attributes ending in just a newline ('\n'). I guess the RFC does indicate SHOULD as opposed to SHALL.

อ่านคำตอบนี้ในบริบท 👍 1

การตอบกลับทั้งหมด (2)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Maybe check out the Firefox source code about rtcp-fb nack.

เปลี่ยนแปลงโดย cor-el เมื่อ

Robert Kirnum
Robert Kirnum เจ้าของคำถาม
more options

วิธีแก้ปัญหาที่เลือก

From http://www.ietf.org/rfc/rfc2327.txt SDP: Session Description Protocol

6. SDP Specification

… 

  Text records such as the session name and information are bytes
  strings which may contain any byte with the exceptions of 0x00 (Nul),
  0x0a (ASCII newline) and 0x0d (ASCII carriage return).  The sequence
  CRLF (0x0d0a) is used to end a record, although parsers should be
  tolerant and also accept records terminated with a single newline
  character.  By default these byte strings contain ISO-10646
  characters in UTF-8 encoding, but this default may be changed using
  the `charset' attribute.

Looks like the Firefox SDP parser requires a carriage return ('\r'), it is unable to process attributes ending in just a newline ('\n'). I guess the RFC does indicate SHOULD as opposed to SHALL.