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• Completely remove high frequencies from wav file with ffmpeg

  21 septembre 2021, par Melvin Bender

  For my speech recognition project, I'd like to completely cut off frequencies above 5000Hz on my wav files using ffmpeg.
I understand there is a lowpass filter for reducing frequencies above a certain value :

  


  ffmpeg -i original.wav -af "lowpass=f=5000" lowpass.wav


  


  However when I check the spectogram, it seems like frequencies above 5000 have been reduced, not completely cut off

  


  Voice sample with 5000Hz filter

  


  How can I completely cut off frequencies with ffmpeg ? Any other software is also fine.

  


• FFMPEG- Could not write header for output file #0 (incorrect codec parameters ?) : Operation not permitted Error initializing output stream 0:2 —

  30 septembre 2021, par Danny

  Hello guys I am trying to create a web-dash manifest for VOD with ffmpeg, but I am getting this error Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted Error initializing output stream 0:2 -- while using vp9 codec and doesn't understand the error and how to resolve it. Can someone help me out ? If I use vp8 instead of vp9 codec, I get the same error, but the ffmpeg log doesn't show any error.

  


  subprocess.call([
                FFMPEG_PATH,
                "-f", "webm_dash_manifest", "-i", 480p_path,
                "-f", "webm_dash_manifest", "-i", 720p_path,
                "-f", "webm_dash_manifest", "-i", audio_path,
                "-c", "copy", "-map", "0", "-map", "1", "-map", "2",
                "-adaptation_sets", "id=0, streams=0,1, id=1, streams=2",
                "-f", "webm_dash_manifest", dash_path
                ])


  


  Thanks in advance

  


  UPDATE :
This is from the ffmpeg log.

  


  ffmpeg version 2021-09-27-git-b786bc7433-full_build-www.gyan.dev 
Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57.  7.100 / 57.  7.100
  libavcodec     59.  9.101 / 59.  9.101
  libavformat    59.  5.100 / 59.  5.100
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8.  9.100 /  8.  9.100
  libswscale      6.  1.100 /  6.  1.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Trailing option(s) found in the command: may be ignored.
[webm_dash_manifest @ 000002242a67e500] Could not find codec parameters for stream 0 (Video: vp9, none(tv, bt709, progressive), 854x480): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, webm_dash_manifest, from '480p.webm':
  Metadata:
    HANDLER         : Created by Tester
    MAJOR_BRAND     : isom
    MINOR_VERSION   : 512
    COMPATIBLE_BRANDS: isomiso2avc1mp41
    HW              : 1
                    :
    BITRATE         : 4000000
                    :
    COMMENT         : vid:v09044240000bq2bmhglths5sm54mgk0
    COPYRIGHT       : 638e55167a0287a903e7b6895ed5d02e
    MAXRATE         : 15000000
                    :
    TE_IS_REENCODE  : 1
                    :
    ENCODER         : Lavf59.2.101
  Duration: 00:00:20.17, bitrate: 907 kb/s
  Stream #0:0: Video: vp9, none(tv, bt709, progressive), 854x480, SAR 1:1 DAR 427:240, 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      HANDLER_NAME    : VideoHandler
      VENDOR_ID       : [0][0][0][0]
      ENCODER         : Lavc59.1.100 libvpx-vp9
      DURATION        : 00:00:20.166000000
      webm_dash_manifest_duration: 20166
      webm_dash_manifest_initialization_range: 1008
      webm_dash_manifest_file_name: 480p.webm
      webm_dash_manifest_track_number: 1
      webm_dash_manifest_cues_start: 2286344
      webm_dash_manifest_cues_end: 2286441
      webm_dash_manifest_bandwidth: 862822
      webm_dash_manifest_cluster_keyframe: 1
      webm_dash_manifest_cue_timestamps: 0,5000,10000,15000,20000
[webm_dash_manifest @ 000002242a69b840] Could not find codec parameters for stream 0 (Video: vp9, none(tv, bt709, progressive), 1280x720): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #1, webm_dash_manifest, from '720p.webm':
  Metadata:
    HANDLER         : Created by Tester
    MAJOR_BRAND     : isom
    MINOR_VERSION   : 512
    COMPATIBLE_BRANDS: isomiso2avc1mp41
    HW              : 1
                    :
    BITRATE         : 4000000
                    :
    COMMENT         : vid:v09044240000bq2bmhglths5sm54mgk0
    COPYRIGHT       : 638e55167a0287a903e7b6895ed5d02e
    MAXRATE         : 15000000
                    :
    TE_IS_REENCODE  : 1
                    :
    ENCODER         : Lavf59.2.101
  Duration: 00:00:20.17, bitrate: 1548 kb/s
  Stream #1:0: Video: vp9, none(tv, bt709, progressive), 1280x720, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn (default)
    Metadata:
      HANDLER_NAME    : VideoHandler
      VENDOR_ID       : [0][0][0][0]
      ENCODER         : Lavc59.1.100 libvpx-vp9
      DURATION        : 00:00:20.166000000
      webm_dash_manifest_duration: 20166
      webm_dash_manifest_initialization_range: 1008
      webm_dash_manifest_file_name: 720p.webm
      webm_dash_manifest_track_number: 1
      webm_dash_manifest_cues_start: 3903085
      webm_dash_manifest_cues_end: 3903182
      webm_dash_manifest_bandwidth: 1473835
      webm_dash_manifest_cluster_keyframe: 1
      webm_dash_manifest_cue_timestamps: 0,5000,10000,15000,20000
Input #2, webm_dash_manifest, from 'audio.webm':
  Metadata:
    HANDLER         : Created by Tester
    MAJOR_BRAND     : isom
    MINOR_VERSION   : 512
    COMPATIBLE_BRANDS: isomiso2avc1mp41
    HW              : 1
                    :
    BITRATE         : 4000000
                    :
    COMMENT         : vid:v09044240000bq2bmhglths5sm54mgk0
    COPYRIGHT       : 638e55167a0287a903e7b6895ed5d02e
    MAXRATE         : 15000000
                    :
    TE_IS_REENCODE  : 1
                    :
    ENCODER         : Lavf59.2.101
  Duration: 00:00:20.16, bitrate: 118 kb/s
  Stream #2:0: Audio: vorbis, 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : SoundHandler
      VENDOR_ID       : [0][0][0][0]
      ENCODER         : Lavc59.1.100 libvorbis
      DURATION        : 00:00:20.158000000
      webm_dash_manifest_duration: 20158
      webm_dash_manifest_initialization_range: 5244
      webm_dash_manifest_file_name: audio.webm
      webm_dash_manifest_track_number: 1
      webm_dash_manifest_cues_start: 298527
      webm_dash_manifest_cues_end: 298624
      webm_dash_manifest_bandwidth: 110530
      webm_dash_manifest_cluster_keyframe: 1
      webm_dash_manifest_cue_timestamps: 0,4994,9983,14978,19971
At least one output file must be specified


  


  The command for converting videos and audio to specific resolutions run without issues.

  


  FFMPEG command directly run in cli.

  


  ffmpeg -f webm_dash_manifest -i 480p.webm -f webm_dash_manifest -i 720p.webm -f webm_dash_manifest -i audio.webm -c copy -map 0 -map 1 -map 2 -f webm_dash_manifest -adaptation_sets "id=0,streams=0,1 id=1,streams=2 my_manifest.mpd


  


• ffmpeg mpegts muxer to dvb receiver

  15 avril 2022, par Illikkal

  transport stream over ip generated by ffmpeg is not detected by DVB Receiver.Receiver status is PCR not detected.I am using the following command

  


  ffmpeg -re -i testvideo.mp4 -map 0:v:0 -map 0:a:0 -pix_fmt yuv420p -r 25 -s 720x576 -aspect 4:3 -qmin 2 -qmax 35 -b:v 1000k -minrate 1000k -maxrate 1000k -bufsize 500k -vcodec libx264 -acodec aac -ab 128k -ac 2 -f mpegts -mpegts_original_network_id 1 -mpegts_transport_stream_id 1 -mpegts_service_id 1 -mpegts_pmt_start_pid 4096 -streamid 0:289 -streamid 1:337 -program title="service1":st=0:st=1 -metadata service_provider="MYCALL" -muxrate 2000k -metadata service_name="My Station ID" -y udp ://239.0.0.1:5000 ?pkt_size=1316&localaddr=192.168.100.114