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• Fixing A/V sync issues with RTP/RTCP sent from mediasoup

  10 décembre 2017, par artushin

  A little background : I’m attempting to record a webrtc call being made through the mediasoup v2 SFU. I’m using mediasoup’s room.createRtpStreamer() method to generate a stream which mirrors RTP/RTCP to ffmpeg. Two streamers are created for audio and video within 30ms of each other and begin broadcasting. FFmpeg then spins up and starts accepting. Pretty sure RTCP is working since ffmpeg is always starting with a keyframe despite being started after the streamer begins broadcasting.

  The problem is that I encounter audio/video desynchronization with seemingly random offsets. My current theory is that this offset is based on how old the last keyframe is that RTCP requests to start the stream. See below for ffmpeg configuration and output but my question is : what ffmpeg arguments can I use to adjust the video frame timestamps to match the audio frame timestamps or vice versa ? I’ve messed around with -map 0:0,0:1 -map 0:1,0:1 but it doesn’t seem to do what I’m looking for.

  ffmpeg flags :

  '-y',
  
  '-loglevel',
  
  'debug',
  
  '-dump',
  
  '-protocol_whitelist',
  
  'file,crypto,udp,rtp,data',
  
  '-analyzeduration',
  
  '20M',
  
  '-probesize',
  
  '20M',
  
  '-i',
  
  `data:text/plain;base64,${sdp.toString('base64')}`,
  
  '-fflags',
  
  '+genpts',
  
  '-vcodec',
  
  'copy',
  
  '-acodec',
  
  'aac',
  
  '-bsf:v',
  
  'h264_mp4toannexb',
  
  '-start_number',
  
  '0',
  
  '-hls_list_size',
  
  '2147480000',
  
  '-hls_wrap',
  
  '0',
  
  '-hls_time',
  
  '10',

  SDP used for input (template) :

  v=0
  
  o=- 0 0 IN IP4 <%=ip %>
  
  s=title
  
  c=IN IP4 <%=ip %>
  
  m=audio <%=audioPort %> RTP/AVPF <%=audioPayload %>
  
  a=sendrecv
  
  a=rtcp-mux
  
  a=rtpmap:<%=audioPayload %> opus/48000/2
  
  a=fmtp:<%=audioPayload %> minptime=10; useinbandfec=1
  
  m=video <%=videoPort %> RTP/AVPF <%=videoPayload %>
  
  a=sendrecv
  
  a=rtcp-mux
  
  a=rtpmap:<%=videoPayload %> H264/90000
  
  a=rtcp-fb:<%=videoPayload %> ccm fir
  
  a=rtcp-fb:<%=videoPayload %> nack
  
  a=rtcp-fb:<%=videoPayload %> nack pli
  
  a=rtcp-fb:<%=videoPayload %> goog-remb
  
  a=rtcp-fb:<%=videoPayload %> transport-cc
  
  a=fmtp:<%=videoPayload %> level-asymmetry-allowed=1;packetization-mode=1

  ffmpeg output - garbled with some timestamps

  1512775954585 - stderr: ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.38)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-ffplay --enable-libmp3lame --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
  1512775954587 - stderr:   libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
  1512775954587 - stderr:   libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Splitting the commandline.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Reading option '-dump' ... matched as option 'dump' (dump each input packet) with argument '1'.
  
  Reading option '-protocol_whitelist' ...1512775954589 - stderr:  matched as AVOption 'protocol_whitelist' with argument 'file,crypto,udp,rtp,data'.
  
  Reading option '-analyzeduration' ...1512775954590 - stderr:  matched as AVOption 'analyzeduration' with argument '20M'.
  
  Reading option '-probesize' ...1512775954590 - stderr:  matched as AVOption 'probesize' with argument '20M'.
  
  Reading option '-i' ... matched as input url with argument 'data:text/plain;base64,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'.
  
  Reading option '-fflags' ...1512775954591 - stderr:  matched as AVOption 'fflags' with argument '+genpts'.
  
  Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'copy'.
  
  Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'aac'.
  
  Reading option '-vsync' ... matched as option 'vsync' (video sync method) with argument '0'.
  
  Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:0,0:1'.
  
  Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:1,0:1'.
  
  Reading option '-bsf:v' ... matched as option 'bsf' (A comma-separated list of bitstream filters) with argument 'h264_mp4toannexb'.
  
  Reading option '-start_number' ...1512775954591 - stderr:  matched as AVOption 'start_number' with argument '0'.
  
  Reading option '-hls_list_size' ...1512775954591 - stderr:  matched as AVOption 'hls_list_size' with argument '2147480000'.
  
  Reading option '-hls_wrap' ... matched as AVOption 'hls_wrap' with argument '0'.
  
  Reading option '-hls_time' ...1512775954591 - stderr:  matched as AVOption 'hls_time' with argument '10'.
  
  Reading option '/tmp/archive/e0c92fa0-dad5-11e7-8687-090dda95b1a4_10e1c990-dc70-11e7-888d-9f39ca0c79bc/1512775954465.m3u8' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option y (overwrite output files) with argument 1.
  
  1512775954592 - stderr: Applying option loglevel (set logging level) with argument debug.
  
  Applying option dump (dump each input packet) with argument 1.
  
  Applying option vsync (video sync method) with argument 0.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url data:text/plain;base64,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.
  
  Successfully parsed a group of options.
  
  Opening an input file: data:text/plain;base64,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.
  
  1512775954592 - stderr: [NULL @ 0x7f81fd000000] Opening 'data:text/plain;base64,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' for reading
  
  1512775954593 - stderr: [data @ 0x7f81fca001a0] Content-type: text/plain
  
  {"level":"info","time":"Dec 8, 2017 11:32 PM","message":"ffmpeg started"}
  
  1512775954595 - stderr: [sdp @ 0x7f81fd000000] Format sdp probed with size=2048 and score=50
  
  1512775954598 - stderr: [sdp @ 0x7f81fd000000] audio codec set to: opus
  
  [sdp @ 0x7f81fd000000] audio samplerate set to: 48000
  
  [sdp @ 0x7f81fd000000] audio channels set to: 2
  
  1512775954639 - stderr: [sdp @ 0x7f81fd000000] video codec set to: h264
  
  [sdp @ 0x7f81fd000000] RTP Packetization Mode: 1
  
  [sdp @ 0x7f81fd000000] RTP Profile IDC: 42 Profile IOP: e0 Level: 1f
  
  [udp @ 0x7f81fcb007e0] end receive buffer size reported is 65536
  
  [udp @ 0x7f81fbe00180] end receive buffer size reported is 65536
  
  [sdp @ 0x7f81fd000000] setting jitter buffer size to 500
  
  [udp @ 0x7f81fbe00680] end receive buffer size reported is 65536
  
  [udp @ 0x7f81fbe00740] end receive buffer size reported is 65536
  
  [sdp @ 0x7f81fd000000] setting jitter buffer size to 500
  
  [sdp @ 0x7f81fd000000] Before avformat_find_stream_info() pos: 479 bytes read:479 seeks:0 nb_streams:2
  
  {"level":"info","time":"Dec 8, 2017 11:32 PM","message":"new active speaker","activePeer":"9f05d96a-9641-4c63-8f0e-486b98e48eb5"}
  
  1512775954773 - stderr: [AVBSFContext @ 0x7f81fc8018e0] nal_unit_type: 7, nal_ref_idc: 3
  
  [AVBSFContext @ 0x7f81fc8018e0] nal_unit_type: 8, nal_ref_idc: 3
  
  [AVBSFContext @ 0x7f81fc8018e0] nal_unit_type: 5, nal_ref_idc: 3
  
  1512775954774 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 7, nal_ref_idc: 3
  
  1512775954774 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 8, nal_ref_idc: 3
  
  1512775954774 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 5, nal_ref_idc: 3
  
  1512775954774 - stderr: [h264 @ 0x7f8200000c00] Reinit context to 640x480, pix_fmt: yuv420p
  
  1512775954801 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 1, nal_ref_idc: 3
  
  1512775954939 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 7, nal_ref_idc: 3
  
  1512775954939 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 8, nal_ref_idc: 3
  
  1512775954940 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 5, nal_ref_idc: 3
  
  1512775955003 - stderr: [h264 @ 0x7f8200000c00] nal_unit_type: 1, nal_ref_idc: 3
  
  1512775955999 - stderr:     Last message repeated 3 times
  
  [sdp @ 0x7f81fd000000] All info found
  
  1512775955999 - stderr: [sdp @ 0x7f81fd000000] rfps: 29.750000 0.019566
  
  [sdp @ 0x7f81fd000000] rfps: 29.833333 0.015263
  
  [sdp @ 0x7f81fd000000] rfps: 29.916667 0.011503
  
  1512775955999 - stderr: [sdp @ 0x7f81fd000000] rfps: 30.000000 0.008285
  
  [sdp @ 0x7f81fd000000] rfps: 31.000000 0.011990
  
      Last message repeated 1 times
  
  [sdp @ 0x7f81fd000000] rfps: 29.970030 0.009380
  
  [sdp @ 0x7f81fd000000] After avformat_find_stream_info() pos: 479 bytes read:479 seeks:0 frames:98
  
  1512775956000 - stderr: Input #0, sdp, from 'data:text/plain;base64,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':
  
  1512775956000 - stderr:   Metadata:
  
      title           : e0c92fa0-dad5-11e7-8687-090dda95b1a4 fooboar
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0, 70, 1/48000: Audio: opus, 48000 Hz, stereo, fltp1512775956000 - stderr:
  
      Stream #0:1, 28, 1/90000: Video: h264 (Constrained Baseline), 1 reference frame, yuv420p(progressive, left), 640x480, 0/1, 30 tbr, 90k tbn, 180k tbc
  
  1512775956000 - stderr: Successfully opened the file.
  
  Parsing a group of options: output url /tmp/archive/e0c92fa0-dad5-11e7-8687-090dda95b1a4_10e1c990-dc70-11e7-888d-9f39ca0c79bc/1512775954465.m3u8.
  
  Applying option vcodec (force video codec ('copy' to copy stream)) with argument copy.
  
  Applying option acodec (force audio codec ('copy' to copy stream)) with argument aac.
  
  Applying option map (set input stream mapping) with argument 0:0,0:1.
  
  Applying option map (set input stream mapping) with argument 0:1,0:1.
  
  Applying option bsf:v (A comma-separated list of bitstream filters) with argument h264_mp4toannexb.
  
  Successfully parsed a group of options.
  
  1512775956000 - stderr: Opening an output file: /tmp/archive/e0c92fa0-dad5-11e7-8687-090dda95b1a4_10e1c990-dc70-11e7-888d-9f39ca0c79bc/1512775954465.m3u8.
  
  1512775956000 - stderr: Successfully opened the file.
  
  1512775956001 - stderr: [AVBSFContext @ 0x7f81fcb020a0] The input looks like it is Annex B already
  
  Stream mapping:
  
  1512775956001 - stderr:   Stream #0:0 -> #0:0 [sync #0:1] (opus (native) -> aac (native))
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.000  pts=0.000
  
    size=82
  
  1512775956001 - stderr: [SWR @ 0x7f820001e600] Using fltp internally between filters
  
  1512775956002 - stderr: detected 8 logical cores
  
  1512775956003 - stderr: [graph_0_in_0_0 @ 0x7f81fc90dfc0] Setting 'time_base' to value '1/48000'
  
  [graph_0_in_0_0 @ 0x7f81fc90dfc0] Setting 'sample_rate' to value '48000'
  
  1512775956003 - stderr: [graph_0_in_0_0 @ 0x7f81fc90dfc0] Setting 'sample_fmt' to value 'fltp'
  
  [graph_0_in_0_0 @ 0x7f81fc90dfc0] Setting 'channel_layout' to value '0x3'
  
  [graph_0_in_0_0 @ 0x7f81fc90dfc0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
  
  [format_out_0_0 @ 0x7f81fc914da0] Setting 'sample_fmts' to value 'fltp'
  
  [format_out_0_0 @ 0x7f81fc914da0] Setting 'sample_rates' to value '96000|88200|64000|48000|44100|32000|24000|22050|16000|12000|11025|8000|7350'
  
  1512775956004 - stderr: [AVFilterGraph @ 0x7f81fbd02200] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed
  
  1512775956007 - stderr: [hls @ 0x7f81fd80f000] Opening '/tmp/archive/e0c92fa0-dad5-11e7-8687-090dda95b1a4_10e1c990-dc70-11e7-888d-9f39ca0c79bc/15127759544650.ts' for writing
  
  [file @ 0x7f81fbf01ee0] Setting default whitelist 'file,crypto'
  
  1512775956007 - stderr: [mpegts @ 0x7f81fd877800] muxrate VBR, pcr every 9000 pkts, sdt every 2147483647, pat/pmt every 2147483647 pkts
  
  Output #0, hls, to '/tmp/archive/e0c92fa0-dad5-11e7-8687-090dda95b1a4_10e1c990-dc70-11e7-888d-9f39ca0c79bc/1512775954465.m3u8':
  
    Metadata:
  
      title           : e0c92fa0-dad5-11e7-8687-090dda95b1a4 fooboar
  
      encoder         : Lavf57.83.100
  
  1512775956007 - stderr:     Stream #0:0, 0, 1/90000: Audio: aac (LC), 48000 Hz, stereo, fltp, delay 1024, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc57.107.100 aac
  
      Stream #0:1, 0, 1/90000: Video: h264 (Constrained Baseline), 1 reference frame, yuv420p(progressive, left), 640x480 (0x0), 0/1, q=2-31, 30 tbr, 90k tbn, 90k tbc
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  1512775956007 - stderr:     Last message repeated 1 times
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.020  pts=0.020
  
    size=79
  
  1512775956007 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
      Last message repeated 1 times
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
  1512775956007 - stderr:   dts=0.040  pts=0.040
  
    size=75
  
  1512775956014 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.0601512775956014 - stderr:   pts=0.060
  
    size=81
  
  1512775956017 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.080  pts=0.080
  
    size=76
  
  1512775956022 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.1001512775956022 - stderr:   pts=0.100
  
    size=79
  
  1512775956023 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #0:
  
    keyframe=1
  
  1512775956023 - stderr:   duration=0.000
  
    dts=0.120  pts=0.120
  
    size=95
  
  1512775956024 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  1512775956024 - stderr: stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.140  pts=0.140
  
    size=93
  
  1512775956025 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #0:
  
    keyframe=1
  
  1512775956025 - stderr:   duration=0.000
  
    dts=0.160  pts=0.160
  
    size=94
  
  1512775956026 - stderr: cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  stream #1:
  
    keyframe=1
  
  1512775956026 - stderr:   duration=0.000
  
    dts=N/A  pts=N/A
  
    size=992
  
  [hls @ 0x7f81fd80f000] Timestamps are unset in a packet for stream 1. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
  
  1512775956026 - stderr: stream #0:
  
    keyframe=1
  
    duration=0.000
  
  1512775956026 - stderr:   dts=0.180  pts=0.180
  
    size=108
  
  1512775956027 - stderr: stream #1:
  
    keyframe=0
  
    duration=0.000
  
  1512775956027 - stderr:   dts=0.002  pts=0.002
  
    size=3047
  
  [hls @ 0x7f81fd80f000] pkt->duration = 0, maybe the hls segment duration will not precise
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.200  pts=0.200
  
    size=89
  
  1512775956060 - stderr: stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.220  pts=0.220
  
    size=73
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.240  pts=0.240
  
    size=78
  
  stream #0:
  
    keyframe=1
  
    duration=0.000
  
    dts=0.260  pts=0.260

  Notice how the first frame for stream #1 (video) starts after a number of audio frames ? Specifically, it starts at stream #0 dts/pts 0.18. In this situation, the a/v sync issue is pretty much unnoticeable, but with a bunch of repros, I’ve determined that the a/v sync offset is always the duration of however long audio frames were sent before the first video frame (sometimes seconds). I’m consistently starting the RTP streams only tens of ms apart, so I can’t control for this variance on the input side.

  After the initial audio frames come in, the first video frame has a dts/pts around 0. What ffmpeg setting would I use to adjust the timestamps accordingly ? I don’t care about losing the starting audio that doesn’t have video, so any solution that would adjust the timestamps works.

• Hikvision NVR video conversion ffmpeg

  6 août 2024, par astralmaster

  I have a Hikvision NVR that stores security camera footage that I need to display on a website. I know that Hikvision uses proprietary H.264 codec that makes it impossible to play (coherently) in popular video players, like VLC, unless you install that codec everywhere you play it.

  



  My plan was to transcode the video using ffmpeg to regular H.264 codec and AAC for audio but the produced file has the same issues as the original - no audio when playing and very disruptive video. 
So the question is, does ffmpeg support encoding from Hikvision video/audio codecs ? Or perhaps should try to convert to different web-capable codecs using ffmpeg ?
My ffmpeg command looks like this :

  



  ffmpeg -i C:\1.mp4  -c:v libx264 -preset fast -crf 30 -b:v 200k -c:a aac -strict experimental -movflags faststart -threads 0 C:\2.mp4


  



  EDIT : What's interesting is that ffplay.exe opens and plays the original video files with no problem whatsoever, even on a computer where Hikvision codecs are not isntalled, therefore I figured conversion should be possible as well ?

  



  Mediainfo output of the video file in question :

  



  General
CompleteName                     : C:\DownLoad\1.mp4
Format                           : MPEG-PS
FileSize/String                  : 8.60 MiB
Duration/String                  : 2 h 7 min
OverallBitRate/String            : 9 395 b/s
FileExtension_Invalid            : mpeg mpg m2p vob pss evo

Video
ID/String                        : 224 (0xE0)
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format_Profile                   : Baseline@L4
Format_Settings                  : 1 Ref Frames
Format_Settings_CABAC/String     : No
Format_Settings_RefFrames/String : 1 frame
Format_Settings_GOP              : M=1, N=30
Duration/String                  : 2 min 0 s
Width/String                     : 1 920 pixels
Height/String                    : 1 080 pixels
DisplayAspectRatio/String        : 16:9
FrameRate_Mode/String            : Variable
ColorSpace                       : YUV
ChromaSubsampling/String         : 4:2:0
BitDepth/String                  : 8 bits
ScanType/String                  : Progressive

Audio
ID/String                        : 192 (0xC0)
Format                           : MPEG Audio
Duration/String                  : 2 h 7 min
Compression_Mode/String          : Lossy
Video_Delay/String               : -33 min 40 s


  



  Output of ffmpeg :

  



  C:\ffmpeg\bin>ffmpeg -i C:\DownLoad\1.mp4  -c:v libx264 -preset fast -crf 30 -b:v 75k -c:a aac -strict experimental -movflags faststart -threads 0 C:\DownLoad\2.mp4
ffmpeg version N-86537-gae6f6d4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 66.100 / 55. 66.100
  libavcodec     57. 99.100 / 57. 99.100
  libavformat    57. 73.100 / 57. 73.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 94.100 /  6. 94.100
  libswscale      4.  7.101 /  4.  7.101
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
Input #0, mpeg, from 'C:\DownLoad\1.mp4':
  Duration: 02:07:57.93, start: 789.820800, bitrate: 9 kb/s
    Stream #0:0[0x1e0]: Video: h264 (Baseline), yuv420p(progressive), 1920x1080, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1c0]: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
File 'C:\DownLoad\2.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0000000002cd0280] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
[libx264 @ 0000000002514c80] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX XOP FMA4
[libx264 @ 0000000002514c80] profile High, level 4.0
[libx264 @ 0000000002514c80] 264 - core 150 r2833 df79067 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 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=12 lookahead_threads=2 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=30.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'C:\DownLoad\2.mp4':
  Metadata:
    encoder         : Lavf57.73.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 75 kb/s, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.99.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/75000 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc57.99.100 aac
[mp4 @ 00000000010e9e00] Starting second pass: moving the moov atom to the beginning of the file speed= 116x
frame= 3269 fps= 66 q=-1.0 Lsize=   11086kB time=01:34:24.38 bitrate=  16.0kbits/s dup=269 drop=0 speed= 115x
video:10429kB audio:592kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.594114%
[libx264 @ 0000000002514c80] frame I:14    Avg QP:21.86  size: 59795
[libx264 @ 0000000002514c80] frame P:833   Avg QP:24.81  size:  8993
[libx264 @ 0000000002514c80] frame B:2422  Avg QP:28.70  size:   970
[libx264 @ 0000000002514c80] consecutive B-frames:  1.0%  0.2%  1.4% 97.4%
[libx264 @ 0000000002514c80] mb I  I16..4: 18.9% 66.3% 14.8%
[libx264 @ 0000000002514c80] mb P  I16..4:  4.0%  7.7%  0.4%  P16..4: 16.2%  2.0%  0.6%  0.0%  0.0%    skip:69.1%
[libx264 @ 0000000002514c80] mb B  I16..4:  0.6%  0.2%  0.0%  B16..8:  5.5%  0.1%  0.0%  direct: 0.7%  skip:92.9%  L0:44.0% L1:55.0% BI: 1.0%
[libx264 @ 0000000002514c80] 8x8 transform intra:59.0% inter:83.3%
[libx264 @ 0000000002514c80] coded y,uvDC,uvAC intra: 25.3% 36.1% 7.7% inter: 1.0% 2.3% 0.1%
[libx264 @ 0000000002514c80] i16 v,h,dc,p: 23% 24% 43% 10%
[libx264 @ 0000000002514c80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 26% 23%  2%  2%  3%  2%  3%  3%
[libx264 @ 0000000002514c80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 23% 12%  4%  4%  5%  4%  4%  2%
[libx264 @ 0000000002514c80] i8c dc,h,v,p: 81%  7%  9%  3%
[libx264 @ 0000000002514c80] Weighted P-Frames: Y:1.0% UV:0.0%
[libx264 @ 0000000002514c80] ref P L0: 73.6% 26.4%
[libx264 @ 0000000002514c80] ref B L0: 80.9% 19.1%
[libx264 @ 0000000002514c80] ref B L1: 90.0% 10.0%
[libx264 @ 0000000002514c80] kb/s:653.30
[aac @ 0000000002cd0280] Qavg: 64512.656

C:\ffmpeg\bin>


  



  Download link to sample :

  



  https://www.dropbox.com/s/9ccptsuiqk2ntsv/1.zip?dl=0

  



  This sample is exactly 2 minutes long, but VLC will tell you otherwise.

  


• FFMPEG ALSA xrun crash

  13 décembre 2017, par Liam Martens

  I’m running a YouTube RTMP stream using FFMPEG with x11grab and an alsa loopback device but sometimes after let’s say 20 hours there is an ALSA xrun and then the ffmpeg command crashes, but I’m not sure why or how this happens. (mind you the ffmpeg command does not run continuously it gets restarted automatically every so often, but the xrun makes the command crash causing the stream to go offline sometimes because a crash restart is not fast enough)

  I’m using thread_queue_size and I’ve even manually compiled ffmpeg with a higher ALSA BUFFER SIZE, but the issue appears to persist still. Besides this I’ve also scoured many posts with people having similar issues but these never really seem to end up resolved.

  This is the stream command

  ffmpeg -loglevel verbose -f alsa -thread_queue_size 12288 -ac 2 -i hw:Loopback,1,0 \
  
           -probesize 10M -f x11grab -field_order tt -thread_queue_size 12288 -video_size 1280x720 -r 30 -i :1.1 \
  
          -c:v libx264 -c:a libmp3lame -shortest -tune fastdecode -tune zerolatency \
  
          -crf 26 -pix_fmt yuv420p -threads 0 -maxrate 2500k -bufsize 2500k -pass 1 -af aresample=async=1 \
  
          -movflags +faststart -flags +global_header -preset ultrafast -r 30 -g 60 -b:v 2000k -b:a 192k -ar 44100 \
  
          -f flv -rtmp_live live rtmp://a.rtmp.youtube.com/live2/{KEY}

  Log excerpt

  ffmpeg version N-89463-gc7a5e80 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  
    configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gpl --enable-libmp3lame --enable-librtmp --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libtheora --enable-postproc --enable-pic --enable-pthreads --enable-shared --disable-stripping --disable-static --enable-vaapi --enable-libopus --enable-libfreetype --enable-libfontconfig --enable-libpulse --disable-debug
  
    libavutil      56.  5.100 / 56.  5.100
  
    libavcodec     58.  6.103 / 58.  6.103
  
    libavformat    58.  3.100 / 58.  3.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  7.100 /  7.  7.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, alsa, from 'hw:Loopback,1,0':
  
    Duration: N/A, start: 1513163617.594224, bitrate: 1536 kb/s
  
      Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  Input #1, x11grab, from ':1.1':
  
    Duration: N/A, start: 1513163617.632434, bitrate: N/A
  
      Stream #1:0: Video: rawvideo, 1 reference frame (BGR[0] / 0x524742), bgr0(top first), 854x480, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  Parsing...
  
  Parsed protocol: 0
  
  Parsed host    : a.rtmp.youtube.com
  
  Parsed app     : live2
  
  RTMP_Connect1, ... connected, handshaking
  
  HandShake: Type Answer   : 03
  
  HandShake: Server Uptime : 0
  
  HandShake: FMS Version   : 4.0.0.1
  
  HandShake: Handshaking finished....
  
  RTMP_Connect1, handshaked
  
  Invoking connect
  
  HandleServerBW: server BW = 2500000
  
  HandleClientBW: client BW = 10000000 2
  
  HandleChangeChunkSize, received: chunk size change to 256
  
  RTMP_ClientPacket, received: invoke 240 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: 
  
  (object begin)
  
  Property: 3,5,3,824>
  
  Property: 
  
  Property: 
  
  (object end)
  
  Property: 
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: 
  
  Property: 
  
  Property: 
  
  (object begin)
  
  Property: 
  
  (object end)
  
  (object end)
  
  (object end)
  
  HandleInvoke, server invoking <_result>
  
  HandleInvoke, received result for method call <connect>
  
  Invoking releaseStream
  
  Invoking FCPublish
  
  Invoking createStream
  
  RTMP_ClientPacket, received: invoke 21 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: NULL
  
  (object end)
  
  HandleInvoke, server invoking <onbwdone>
  
  Invoking _checkbw
  
  RTMP_ClientPacket, received: invoke 29 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: NULL
  
  Property: 
  
  (object end)
  
  HandleInvoke, server invoking &lt;_result>
  
  HandleInvoke, received result for method call <createstream>
  
  Invoking publish
  
  RTMP_ClientPacket, received: invoke 73 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: NULL
  
  Property: 
  
  (object begin)
  
  Property: 
  
  Property: 
  
  (object end)
  
  (object end)
  
  HandleInvoke, server invoking <onstatus>
  
  HandleInvoke, onStatus: NetStream.Publish.Start
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  [graph 0 input from stream 1:0 @ 0x5607d087e060] w:854 h:480 pixfmt:bgr0 tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2
  
  [auto_scaler_0 @ 0x5607d087d800] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 0x5607d087ed40] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [auto_scaler_0 @ 0x5607d087d800] w:854 h:480 fmt:bgr0 sar:0/1 -> w:854 h:480 fmt:yuv420p sar:0/1 flags:0x4
  
  [swscaler @ 0x5607d0880260] Warning: data is not aligned! This can lead to a speed loss
  
  [libx264 @ 0x5607d08684e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x5607d08684e0] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x5607d08684e0] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=2 lookahead_threads=2 sliced_threads=1 slices=2 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=60 keyint_min=6 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=26.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1500 vbv_bufsize=1500 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
  
  [graph_1_in_0_0 @ 0x5607d091c840] tb:1/48000 samplefmt:s16 samplerate:48000 chlayout:0x3
  
  [Parsed_aresample_0 @ 0x5607d0916b40] ch:2 chl:stereo fmt:s16 r:48000Hz -> ch:2 chl:stereo fmt:s16p r:44100Hz
  
  Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/{KEY}':
  
    Metadata:
  
      encoder         : Lavf58.3.100
  
      Stream #0:0: Video: h264 (libx264), 1 reference frame ([7][0][0][0] / 0x0007), yuv420p(top coded first (swapped)), 854x480, q=-1--1, 1000 kb/s, 30 fps, 1k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc58.6.103 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 1500000/0/1000000 buffer size: 1500000 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p, delay 1105, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc58.6.103 libmp3lame
  
  frame=   29 fps=0.0 q=17.0 size=     146kB time=00:00:00.94 bitrate=1267.3kbits/s speed=1.86x    
  
  frame=   44 fps= 44 q=18.0 size=     168kB time=00:00:01.46 bitrate= 942.4kbits/s speed=1.45x    
  
  frame=   60 fps= 40 q=16.0 size=     191kB time=00:00:01.96 bitrate= 794.8kbits/s speed= 1.3x    
  
  ...
  
  frame= 2740 fps= 30 q=17.0 size=    7993kB time=00:01:31.32 bitrate= 717.0kbits/s speed=   1x    
  
  frame= 2755 fps= 30 q=18.0 size=    8013kB time=00:01:31.82 bitrate= 714.9kbits/s speed=   1x    
  
  [alsa @ 0x5607d084d7e0] ALSA buffer xrun.
  
  </onstatus></createstream></onbwdone></connect>