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• convert video with ffmpeg command line. but the video stream and audio stream are out of sync

  24 juin 2016, par zack chen

  I use ffmpeg cmd to convert some mkv video files to flv.

  The source files are downloaded from this site : Sample mkv files

  ffmpeg -i input.mkv -c:v libx264 -crf 20 -preset ultrafast -c:a aac -ar 22050 -y output.flv

  However the output video seems lose some frames, the FPS dropped from 25 to 5 suddenly and The video stream and audio stream are out of sync.

  I tested some mkv files downloaded from another site, the output file could play well.
  So, I guess it may be caused by the mkv files downloaded from the site : http://www.sample-videos.com/index.php#sample-mkv-video

  But i couldn’t find the reason. Could you help me ?

  I get the video info by ffprobe, as below.

  {
  
  "streams": [
  
      {
  
          "index": 0,
  
          "codec_name": "h264",
  
          "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
          "profile": "Main",
  
          "codec_type": "video",
  
          "codec_time_base": "1/50",
  
          "codec_tag_string": "[0][0][0][0]",
  
          "codec_tag": "0x0000",
  
          "width": 320,
  
          "height": 240,
  
          "coded_width": 320,
  
          "coded_height": 240,
  
          "has_b_frames": 0,
  
          "sample_aspect_ratio": "1:1",
  
          "display_aspect_ratio": "4:3",
  
          "pix_fmt": "yuv420p",
  
          "level": 20,
  
          "chroma_location": "left",
  
          "refs": 1,
  
          "is_avc": "true",
  
          "nal_length_size": "4",
  
          "r_frame_rate": "25/1",
  
          "avg_frame_rate": "25/1",
  
          "time_base": "1/1000",
  
          "duration_ts": 9818,
  
          "duration": "9.818000",
  
          "bits_per_raw_sample": "8",
  
          "disposition": {
  
              "default": 1,
  
              "dub": 0,
  
              "original": 0,
  
              "comment": 0,
  
              "lyrics": 0,
  
              "karaoke": 0,
  
              "forced": 0,
  
              "hearing_impaired": 0,
  
              "visual_impaired": 0,
  
              "clean_effects": 0,
  
              "attached_pic": 0
  
          }
  
      },
  
      {
  
          "index": 1,
  
          "codec_name": "aac",
  
          "codec_long_name": "AAC (Advanced Audio Coding)",
  
          "profile": "LC",
  
          "codec_type": "audio",
  
          "codec_time_base": "1/48000",
  
          "codec_tag_string": "[0][0][0][0]",
  
          "codec_tag": "0x0000",
  
          "sample_fmt": "fltp",
  
          "sample_rate": "48000",
  
          "channels": 6,
  
          "channel_layout": "5.1",
  
          "bits_per_sample": 0,
  
          "r_frame_rate": "0/0",
  
          "avg_frame_rate": "0/0",
  
          "time_base": "1/1000",
  
          "duration_ts": 9818,
  
          "duration": "9.818000",
  
          "disposition": {
  
              "default": 1,
  
              "dub": 0,
  
              "original": 0,
  
              "comment": 0,
  
              "lyrics": 0,
  
              "karaoke": 0,
  
              "forced": 0,
  
              "hearing_impaired": 0,
  
              "visual_impaired": 0,
  
              "clean_effects": 0,
  
              "attached_pic": 0
  
          }
  
      }
  
  ],
  
  "format": {
  
      "filename": "big_buck_bunny_240p_1mb.mkv",
  
      "nb_streams": 2,
  
      "nb_programs": 0,
  
      "format_name": "matroska,webm",
  
      "format_long_name": "Matroska / WebM",
  
      "duration": "9.818000",
  
      "size": "1055721",
  
      "bit_rate": "860233",
  
      "probe_score": 100,
  
      "tags": {
  
          "ENCODER": "Lavf53.24.2"
  
      }
  
  }
  
  }

• ffmpeg : stream -> edit -> stream ERROR : av_interleaved_write_frame() : Operation not permitted Error writing trailer of rtmps

  14 février 2021, par Yurii Kyparus

  I'm reading the horizontal hls stream, placing it in the middle of the vertical layout.

  


  


  


   ffmpeg  -i "https://......a1f6039622.m3u8" -vf "pad=iw:2*trunc(iw*16/18):(ow-iw)/2:(oh-ih)/2,setsar=1" -c:v libx264 -pix_fmt yuv420p -profile:v main -c:a aac  -f flv -flvflags no_duration_filesize  rtmps://...e.live-video.net:443/app/secret_key

  


  


  

Getting next error :


  


  


  WriteN, RTMP send error 32 (129 bytes)54kB time=00:00:10.22 bitrate=1164.8kbits/s speed=3.81x
WriteN, RTMP send error 0 (91 bytes)
WriteN, RTMP send error 9 (42 bytes)
av_interleaved_write_frame(): Operation not permitted
Error writing trailer of rtmps://94e...net:443/app/...gSK: Operation not permitted
frame=  308 fps= 13 q=29.0 Lsize=    1535kB time=00:00:10.80 bitrate=1164.0kbits/s speed=0.44x
video:1396kB audio:177kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libx264 @ 0x7ff3c8888000] frame I:2     Avg QP:12.40  size: 46750
[libx264 @ 0x7ff3c8888000] frame P:81    Avg QP:17.80  size: 13636
[libx264 @ 0x7ff3c8888000] frame B:225   Avg QP:21.47  size:  3330
[libx264 @ 0x7ff3c8888000] consecutive B-frames:  1.6%  2.6%  1.0% 94.8%
[libx264 @ 0x7ff3c8888000] mb I  I16..4: 82.0%  0.0% 18.0%
[libx264 @ 0x7ff3c8888000] mb P  I16..4:  5.7%  0.0%  1.0%  P16..4: 13.6%  4.3%  1.8%  0.0%  0.0%    skip:73.6%
[libx264 @ 0x7ff3c8888000] mb B  I16..4:  0.5%  0.0%  0.0%  B16..8:  9.5%  1.2%  0.1%  direct: 1.7%  skip:87.0%  L0:43.7% L1:52.7% BI: 3.5%
[libx264 @ 0x7ff3c8888000] coded y,uvDC,uvAC intra: 11.8% 49.2% 2.0% inter: 1.9% 5.8% 0.0%
[libx264 @ 0x7ff3c8888000] i16 v,h,dc,p: 69% 15%  9%  7%
[libx264 @ 0x7ff3c8888000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 17% 19%  4%  5%  7%  4%  5%  3%
[libx264 @ 0x7ff3c8888000] i8c dc,h,v,p: 58% 15% 26%  2%
[libx264 @ 0x7ff3c8888000] Weighted P-Frames: Y:28.4% UV:0.0%
[libx264 @ 0x7ff3c8888000] ref P L0: 63.4% 15.3% 15.7%  5.0%  0.6%
[libx264 @ 0x7ff3c8888000] ref B L0: 90.5%  7.7%  1.8%
[libx264 @ 0x7ff3c8888000] ref B L1: 96.2%  3.8%
[libx264 @ 0x7ff3c8888000] kb/s:1517.33
[aac @ 0x7ff3c8889800] Qavg: 5013.114

  


  


  



• Get x264 options from stream

  29 juillet 2014, par HardRock

  I have a problem with H264 encoding, actually with libx264 :(

  I want to encode series of images from web camera into h264 and send stream to chines DVR. Problem is DVR can’t decode my stream. I tried to adjust (using h264stream_analyzer) SPS and PPS in libx264 to match SPS and PPS headers from "correct stream", produced by other chinese DVR’s and IP cameras. But no luck :( Looks like problem in bitstream.

  My stream and "correct" stream - are both may be converted and played with avconv (ffmpeg), for example.
  Transport is ok. If i send "correct stream" - DVR understand it. Problem in stream.

  One strange thing - "correct stream" contains a lot of 28 and 29 slice types. From h264 specification this is must be "fragmentation" units. But my stream contains only P and I slices, но fragmens.

  So how i can get exact stream encoding parameters from existing sample stream ? It may be difference in x264 versions ?