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• what is the correct command using gstreamer to convert mp4 to 264 file ?

  25 mars 2020, par hilow

  My english is pool, i am sorry !

  I use ffmpeg and gstreamer convert mp4 file to 264 format, but the output file is different.
  The question is :

  • 1.Why they are different file ?

  • 2.What is the level mean in gst-discoverer-1.0 ?

    Use ffmpeg it is Codec:     video/x-h264, ...... level=(string)1.2.

    Use gstreamer it is Codec:     video/x-h264, ...... level=(string)3.

  • 3.How to use gstreamer to convert the correct 264 file ?

  The original video file is come from https://github.com/notedit/media-server-go-demo/blob/master/video-mixer/public/big_buck_bunny.mp4 .

  command :

  gst-launch-1.0 filesrc location=big_buck_bunny.mp4 ! \
  
      qtdemux name=demux \
  
        demux.video_0 ! queue ! \
  
        decodebin ! \
  
        videoconvert ! \
  
        videoscale ! \
  
        videorate ! \
  
        video/x-raw,width=320,height=240,framerate=15/1,pixel-aspect-ratio=1/1,level=1.2 ! \
  
        x264enc bframes=0 byte-stream=true bitrate=9000 ! \
  
        filesink location=videogst.264
  
  
  
  ffmpeg -i big_buck_bunny.mp4 -f h264 -vcodec libx264 -s 320x240 -bf 0 -r 15 videoffmpeg.264

  output file :

  -rw-r--r-- 1 xxx staff 1.9M 3 25 13:39 videoffmpeg.264
  
  -rw-r--r-- 1 xxx staff 17M 3 25 13:40 videogst.264

  video codec :

  xxx@xxxs-MacBook-Pro resource %  gst-discoverer-1.0 videoffmpeg.264 -v
  
  Analyzing file:///Users/xxx/tool/resource/videoffmpeg.264
  
  Done discovering file:///Users/xxx/tool/resource/videoffmpeg.264
  
  
  
  Topology:
  
    video: video/x-h264, width=(int)320, height=(int)240, framerate=(fraction)15/1, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)avc, alignment=(string)au, profile=(string)high, level=(string)1.2, codec_data=(buffer)0164000cffe100176764000cacb20283f420000003002000000303c1e2854901000668ebc3cb22c0
  
      Tags:
  
        视频编码: H.264 (High Profile)
  
  
  
      Codec:
  
        video/x-h264, width=(int)320, height=(int)240, framerate=(fraction)15/1, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)avc, alignment=(string)au, profile=(string)high, level=(string)1.2, codec_data=(buffer)0164000cffe100176764000cacb20283f420000003002000000303c1e2854901000668ebc3cb22c0
  
      Additional info:
  
        None
  
      Stream ID: 349989c8845fcc23360fb0ab02ea7510051b926669bf8f3862879823fbab6daf
  
      Width: 320
  
      Height: 240
  
      Depth: 24
  
      Frame rate: 15/1
  
      Pixel aspect ratio: 1/1
  
      Interlaced: false
  
      Bitrate: 0
  
      Max bitrate: 0
  
  
  
  Properties:
  
    Duration: 0:01:32.995000000
  
    Seekable: yes
  
    Live: no
  
    Tags:
  
        视频编码: H.264 (High Profile)
  
  
  
  
  
  xxx@xxxs-MacBook-Pro resource % gst-discoverer-1.0 videogst.264 -v
  
  Analyzing file:///Users/xxx/tool/resource/videogst.264
  
  Done discovering file:///Users/xxx/tool/resource/videogst.264
  
  
  
  Topology:
  
    video: video/x-h264, pixel-aspect-ratio=(fraction)1/1, width=(int)320, height=(int)240, framerate=(fraction)15/1, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)avc, alignment=(string)au, profile=(string)high, level=(string)3, codec_data=(buffer)0164001effe1001d6764001eacb20283f602d4180416940000030004000003007a3c58b92001000568ebccb22c
  
      Tags:
  
        视频编码: H.264 (High Profile)
  
  
  
      Codec:
  
        video/x-h264, pixel-aspect-ratio=(fraction)1/1, width=(int)320, height=(int)240, framerate=(fraction)15/1, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)avc, alignment=(string)au, profile=(string)high, level=(string)3, codec_data=(buffer)0164001effe1001d6764001eacb20283f602d4180416940000030004000003007a3c58b92001000568ebccb22c
  
      Additional info:
  
        None
  
      Stream ID: fb99f4104b347e5682d52c0bd65bcee91b765e42f89ce2e3553be5d6d743a666
  
      Width: 320
  
      Height: 240
  
      Depth: 24
  
      Frame rate: 15/1
  
      Pixel aspect ratio: 1/1
  
      Interlaced: false
  
      Bitrate: 0
  
      Max bitrate: 0
  
  
  
  Properties:
  
    Duration: 0:01:45.505000000
  
    Seekable: yes
  
    Live: no
  
    Tags:
  
        视频编码: H.264 (High Profile)

• Set correct start time of ts-file using ffmpeg

  9 octobre 2020, par Daniel

  I am splitting up a video into multiple 10 second ts-parts (mpeg-ts format) using ffmpeg on windows.

  



  To create the 2nd part (that starts at 10 seconds into the video and ends at 20 seconds into the video) :

  



  ffmpeg -i sample.avi -ss 00:00:10 -to 00:00:20 -vcodec libx264 -acodec aac -vf scale=426:-1 out1.ts


  



  But when i check the file using ffprobe it says :

  



  Duration: 00:00:10.02, start: 1.458667, bitrate: 359 kb/s


  



  So the duration is ok but the start time is incorrect. Is it anyway i can use ffmpeg to correct it to 00:00:20 ?
The best solution would of course to be able to set the correct start time in my first command where i take out the 10 second part but i would also be ok with running a 2nd command to fix the time.

  



  Is this possible ? Cant find any documentation and all examples i found are not for my exact problem and don't seem to work then i play around with them.

  



  Full output from ffprobe :

  



  ffprobe.exe out1.ts
ffprobe version git-2020-02-06-343ccfc Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 39.100 / 56. 39.100
  libavcodec     58. 68.100 / 58. 68.100
  libavformat    58. 38.100 / 58. 38.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 74.100 /  7. 74.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mpegts, from 'out1.ts':
  Duration: 00:00:10.02, start: 1.458667, bitrate: 359 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 426x260 [SAR 780:781 DAR 18:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 131 kb/s


  


• How do I make sure FFmpeg generates the correct duration ?

  14 juillet 2019, par Wang

  For example, the following command creates a three-second video.

  ffmpeg -f lavfi -i color=c=red:r=30:d=3:size=800x600 red.nut

  But ffprobe shows the duration is N/A :

  [STREAM]
  
  index=0
  
  codec_name=mpeg4
  
  codec_long_name=MPEG-4 part 2
  
  profile=Simple Profile
  
  codec_type=video
  
  codec_time_base=0/1
  
  codec_tag_string=FMP4
  
  codec_tag=0x34504d46
  
  width=800
  
  height=600
  
  coded_width=800
  
  coded_height=600
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=4:3
  
  pix_fmt=yuv420p
  
  level=1
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  quarter_sample=false
  
  divx_packed=false
  
  id=N/A
  
  r_frame_rate=30/1
  
  avg_frame_rate=0/0
  
  time_base=1/61440
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:encoder=Lavc57.107.100 mpeg4
  
  [/STREAM]

  Is there flag I can set to allow FFmpeg to generate the correct duration_ts and duration ?