気がついたらffmpeg 4.1 がリリースされていました。gitkで修正を見るとsrt(libsrt.c)にいくつかの修正が入りました。
バグ修正
私が見つけた2件のバグが解消していました。
libsrt 関連のオプション
libsrt 関連のオプションが増えています。以下のようにして確認できます。
ffmpeg -h full |less
libsrtを検索。
libsrt AVOptions:
-rw_timeout <int64> ED....... Timeout of socket I/O operations (from -1 to I64_MAX) (default -1)
-listen_timeout <int64> ED....... Connection awaiting timeout (from -1 to I64_MAX) (default -1)
-send_buffer_size <int> ED....... Socket send buffer size (in bytes) (from -1 to INT_MAX) (default -1)
-recv_buffer_size <int> ED....... Socket receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
-pkt_size <int> ED....... Maximum SRT packet size (from -1 to 1456) (default -1)
ts_size ED.......
max_size ED.......
-payload_size <int> ED....... Maximum SRT packet size (from -1 to 1456) (default -1)
ts_size ED.......
max_size ED.......
-maxbw <int64> ED....... Maximum bandwidth (bytes per second) that the connection can use (from -1 to I64_MAX) (default -1)
-pbkeylen <int> ED....... Crypto key len in bytes {16,24,32} Default: 16 (128-bit) (from -1 to 32) (default -1)
-passphrase <string> ED....... Crypto PBKDF2 Passphrase size[0,10..64] 0:disable crypto
-mss <int> ED....... The Maximum Segment Size (from -1 to 1500) (default -1)
-ffs <int> ED....... Flight flag size (window size) (in bytes) (from -1 to INT_MAX) (default -1)
-ipttl <int> ED....... IP Time To Live (from -1 to 255) (default -1)
-iptos <int> ED....... IP Type of Service (from -1 to 255) (default -1)
-inputbw <int64> ED....... Estimated input stream rate (from -1 to I64_MAX) (default -1)
-oheadbw <int> ED....... MaxBW ceiling based on % over input stream rate (from -1 to 100) (default -1)
-latency <int64> ED....... receiver delay to absorb bursts of missed packet retransmissions (from -1 to I64_MAX) (default -1)
-tsbpddelay <int64> ED....... deprecated, same effect as latency option (from -1 to I64_MAX) (default -1)
-rcvlatency <int64> ED....... receive latency (from -1 to I64_MAX) (default -1)
-peerlatency <int64> ED....... peer latency (from -1 to I64_MAX) (default -1)
-tlpktdrop <int> ED....... Enable receiver pkt drop (from -1 to 1) (default -1)
-nakreport <int> ED....... Enable receiver to send periodic NAK reports (from -1 to 1) (default -1)
-connect_timeout <int64> ED....... Connect timeout. Caller default: 3000, rendezvous (x 10) (from -1 to I64_MAX) (default -1)
-mode <int> ED....... Connection mode (caller, listener, rendezvous) (from 0 to 2) (default caller)
caller ED.......
listener ED.......
rendezvous ED.......
-sndbuf <int> ED....... Send buffer size (in bytes) (from -1 to INT_MAX) (default -1)
-rcvbuf <int> ED....... Receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
-lossmaxttl <int> ED....... Maximum possible packet reorder tolerance (from -1 to INT_MAX) (default -1)
-minversion <int> ED....... The minimum SRT version that is required from the peer (from -1 to INT_MAX) (default -1)
-streamid <string> ED....... A string of up to 512 characters that an Initiator can pass to a Responder
-smoother <string> ED....... The type of Smoother used for the transmission for that socket
-messageapi <int> ED....... Enable message API (from -1 to 1) (default -1)
-transtype <int> ED....... The transmission type for the socket (from 0 to 2) (default 2)
live ED.......
file ED.......
追加情報
ffmpegのダウンロードのページからダウンロードできるプリビルドバイナリでは残念ながらlibsrtは有効にはなっていませんでした。
なので、libsrtを使いたい場合はソースからビルドしましょう。
ffmpeg 4.0 をlibsrtを有効にしてビルドする
(ただし4.0でなくて4.1以降をcheckoutする)