ffmpeg을 이용한 RTMP 영상 스트리밍

ffmpeg을 이용한 RTMP 영상 스트리밍

2020, Nov 21    

Windows10 환경에서 ffmpeg을 이용해서 mp4 파일을 실시간으로 읽고 트랜스코딩 해서 RTMP로 실시간 전송하는 방법을 알아본다.

RTMP 서버는 Ant Media Server를 이용할 수 있고 OBS를 이용하여 RTMP전송을 시험할 수도 있다.

인코딩된 영상 파일 스트리밍

인코딩된 영상 파일을 입력(-i)받아 실시간(-re)으로 읽고 영상, 응성 코덱은 유지하고(-c copy) RTMP 전송을 위해 영상포맷을 변경(-f flv)해서 RTMP 서버로 전송한다.

❯ ffmpeg.exe -re -i .\BigBuckBunny.mp4 -c copy -f flv rtmp://192.168.0.92:1955/application/stream_key

ffmpeg version 4.3.1-2020-10-01-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  . . . 컴파일정보 생략
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\BigBuckBunny.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isomavc1mp42
    creation_time   : 2010-01-10T08:29:06.000000Z
  Duration: 00:09:56.47, start: 0.000000, bitrate: 2119 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2010-01-10T08:29:06.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1991 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc (default)
    Metadata:
      creation_time   : 2010-01-10T08:29:06.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
Output #0, flv, to 'rtmp://192.168.0.92:1955/application/stream':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isomavc1mp42
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: h264 (High) ([7][0][0][0] / 0x0007), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 1991 kb/s, 24 fps, 24 tbr, 1k tbn, 24k tbc (default)
    Metadata:
      creation_time   : 2010-01-10T08:29:06.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
    Stream #0:1(und): Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2010-01-10T08:29:06.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
av_interleaved_write_frame(): Unknown errortime=00:04:09.52 bitrate=2184.7kbits/s speed=   1x
[flv @ 000001d65a9bc0c0] Failed to update header with correct duration.
[flv @ 000001d65a9bc0c0] Failed to update header with correct filesize.
Error writing trailer of rtmp://192.168.0.92:1955/application/stream: Error number -10053 occurred
frame= 5984 fps= 24 q=-1.0 Lsize=   66544kB time=00:04:09.77 bitrate=2182.5kbits/s speed=   1x
video:62435kB audio:3829kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.423518%

RTSP 영상스트림(HEVC코덱) 실시간 RTMP 전송

RTMP 전송 프로토콜에서 사용하는 flv 미디어포맷은 HEVC(h.265) 코덱을 지원하지 않아 AVC(h.264) 코덱으로 변경이 필요하다.

RTSP 영상스트림을 입력(-i)받아 실시간(-re)으로 읽고 음성코덱은 AAC(-c:a aac), 영상코덱은 h264(-c:v h264)로 트랜스코딩 하고 RTMP 전송을 위해 영상포맷을 변경(-f flv)해서 RTMP 서버로 전송한다.

❯ ffmpeg.exe -re -i rtsp://iws.localdomain.com:50554/main -c:a aac -c:v h264 -f flv rtmp://192.168.0.92:1955/application/stream_key

[rtsp @ 0000028c8198dcc0] method SETUP failed: 461 Unsupported Transport
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, rtsp, from 'rtsp://iws.localdomain.com:50554/main':
  Metadata:
    title           : Media Presentation
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuvj420p(pc, bt709), 1920x1080, 25 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_alaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0000028c81a50540] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
[libx264 @ 0000028c81e50780] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000028c81e50780] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0000028c81e50780] 264 - core 161 r3018 db0d417 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, flv, to 'rtmp://192.168.0.92:1955/application/stream':
  Metadata:
    title           : Media Presentation
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuvj420p(pc), 1920x1080, q=-1--1, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc58.91.100 aac
[hevc @ 0000028c81a41cc0] Could not find ref with POC 41.72 bitrate=1109.1kbits/s speed=0.997x
[hevc @ 0000028c81a1da40] Could not find ref with POC 38.07 bitrate=1140.4kbits/s speed=0.999x
[hevc @ 0000028c81a1da40] Could not find ref with POC 39.50 bitrate=1183.1kbits/s speed=0.999x
[hevc @ 0000028c81a52940] Could not find ref with POC 43.01 bitrate=1225.0kbits/s speed=   1x
[hevc @ 0000028c819a1d40] Could not find ref with POC 10.05 bitrate=1227.0kbits/s speed=   1x
frame=35154 fps= 25 q=28.0 size=  209602kB time=00:23:27.23 bitrate=1220.2kbits/s speed=   1x

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# ffmpeg # ffplay # rtsp # rtmp