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    21 juin 2013, par

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Sur d’autres sites (6026)

  • FFmpeg only reading one channel

    29 août 2017, par AbstractDissonance

    Trying to read a stereo wav file and ffmpeg is only reading one channel. ffprobe returns 2 channels.

    I have used -ac 2 and then added -channel_layout stereo but all return 1 channel(or basically filling half the buffer I created).

    Basically the output size of ffmpeg is about half the wav file size.

    What I would like is for it to return every channel in

    Channel1_sample1, channel2_sample1, ..., ChannelN_sample1, channel1_sample2, etc...

    But, in reality, I’d rather just have it work with stereo ;) I’m giving it plenty large enough buffer to read to, so that isn’t the problem either.

    Here is the output

    ffprobe.exe -hide_banner -v quiet -print_format flat -show_streams -i temp.wav
    
streams.stream.0.index=0
    
streams.stream.0.codec_name="pcm_s16le"
    
streams.stream.0.codec_long_name="PCM signed 16-bit little-endian"
    
streams.stream.0.profile="unknown"
    
streams.stream.0.codec_type="audio"
    
streams.stream.0.codec_time_base="1/44100"
    
streams.stream.0.codec_tag_string="[1][0][0][0]"
    
streams.stream.0.codec_tag="0x0001"
    
streams.stream.0.sample_fmt="s16"
    
streams.stream.0.sample_rate="44100"
    
streams.stream.0.channels=2
    
streams.stream.0.channel_layout="unknown"
    
streams.stream.0.bits_per_sample=16
    
streams.stream.0.id="N/A"
    
streams.stream.0.r_frame_rate="0/0"
    
streams.stream.0.avg_frame_rate="0/0"
    
streams.stream.0.time_base="1/44100"
    
streams.stream.0.start_pts="N/A"
    
streams.stream.0.start_time="N/A"
    
streams.stream.0.duration_ts=14200200
    
streams.stream.0.duration="322.000000"
    
streams.stream.0.bit_rate="1411200"
    
streams.stream.0.max_bit_rate="N/A"
    
streams.stream.0.bits_per_raw_sample="N/A"
    
streams.stream.0.nb_frames="N/A"
    
streams.stream.0.nb_read_frames="N/A"
    
streams.stream.0.nb_read_packets="N/A"
    
streams.stream.0.disposition.default=0
    
streams.stream.0.disposition.dub=0
    
streams.stream.0.disposition.original=0
    
streams.stream.0.disposition.comment=0
    
streams.stream.0.disposition.lyrics=0
    
streams.stream.0.disposition.karaoke=0
    
streams.stream.0.disposition.forced=0
    
streams.stream.0.disposition.hearing_impaired=0
    
streams.stream.0.disposition.visual_impaired=0
    
streams.stream.0.disposition.clean_effects=0
    
streams.stream.0.disposition.attached_pic=0
    
streams.stream.0.disposition.timed_thumbnails=0
    
ffmpeg.exe -i temp.wav -loglevel quiet -f s16le -ac 2 -channel_layout stereo -

    temp.wav is just a standard stereo wav file.

  • FFMPEG - How to pipe RMS_level and pts_time metadata without generating unwanted metadata

    6 février 2020, par Tovi Newman

    I am trying to find the loudest (highest rms_level) moment in an audio file, but I need to pipe the metadata rather than write to a file.

    I converted the answer found here : [https://superuser.com/questions/1183663/determining-audio-level-peaks-with-ffmpeg][1]

    By removing the write to file command and adding a pipe.
    Here’s what I’ve got.

    ffmpeg -i loudSoft.mp3 -af astats=metadata=1:reset=1,ametadata=print:key=lavfi.astats.Overall.RMS_level -f null - 2> result.txt

    The only problem is, now I’ve got a lot of unwanted metadata before and after the RMS_level and pts_time data as well as [Parsed_ametadata_1 @ 0x7f9d42c37500] being printed on each line. None of that was being written when I was writing to a file instead of piping. (all I need is the time and the rms.)

    Here is an abridged version of what I get when I write to file :

    frame:0    pts:0       pts_time:0
    
lavfi.astats.Overall.RMS_level=-inf
    
frame:1    pts:47      pts_time:0.00106576
    
lavfi.astats.Overall.RMS_level=-165.163347
    
frame:2    pts:1199    pts_time:0.0271882
    
lavfi.astats.Overall.RMS_level=-99.736394
    
frame:3    pts:2351    pts_time:0.0533107
    
lavfi.astats.Overall.RMS_level=-88.112282
    
frame:4    pts:3503    pts_time:0.0794331
    
lavfi.astats.Overall.RMS_level=-86.554314
    
frame:5    pts:4655    pts_time:0.105556
    
lavfi.astats.Overall.RMS_level=-82.977501
    
frame:6    pts:5807    pts_time:0.131678
    
lavfi.astats.Overall.RMS_level=-79.698739
    
frame:7    pts:6959    pts_time:0.1578
    
lavfi.astats.Overall.RMS_level=-76.629393
    
frame:8    pts:8111    pts_time:0.183923
    
lavfi.astats.Overall.RMS_level=-71.581211
    
frame:9    pts:9263    pts_time:0.210045
    
lavfi.astats.Overall.RMS_level=-75.038503
    
frame:10   pts:10415   pts_time:0.236168

    And here is what I’m looking at :

    ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple clang version 11.0.0 (clang-1100.0.33.16)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
    
  libavutil      56. 31.100 / 56. 31.100
    
  libavcodec     58. 54.100 / 58. 54.100
    
  libavformat    58. 29.100 / 58. 29.100
    
  libavdevice    58.  8.100 / 58.  8.100
    
  libavfilter     7. 57.100 /  7. 57.100
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  5.100 /  5.  5.100
    
  libswresample   3.  5.100 /  3.  5.100
    
  libpostproc    55.  5.100 / 55.  5.100
    
Input #0, mp3, from 'loudSoft2.mp3':
    
  Metadata:
    
    encoder         : Lavf58.29.100
    
  Duration: 00:00:09.85, start: 0.025057, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc58.54
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
    
Press [q] to stop, [?] for help
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] frame:0    pts:0       pts_time:0
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-inf
    
Output #0, null, to 'pipe:':
    
  Metadata:
    
    encoder         : Lavf58.29.100
    
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
    
    Metadata:
    
      encoder         : Lavc58.54.100 pcm_s16le
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] frame:1    pts:47      pts_time:0.00106576
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-165.163347
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] frame:2    pts:1199    pts_time:0.0271882
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-99.736394
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] frame:3    pts:2351    pts_time:0.0533107
    

    

    
*** MIDDLE OMITTED FOR BREVITY ***
    

    

    
[Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-88.532185
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] frame:375  pts:430895  pts_time:9.77086
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-88.594276
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] frame:376  pts:432047  pts_time:9.79698
    
[Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-88.654138
    
size=N/A time=00:00:09.82 bitrate=N/A speed=82.6x    
    
video:0kB audio:1692kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    
[Parsed_astats_0 @ 0x7f9d42c37280] Channel: 1
    
[Parsed_astats_0 @ 0x7f9d42c37280] DC offset: 0.000001
    
[Parsed_astats_0 @ 0x7f9d42c37280] Min level: -0.000106
    
[Parsed_astats_0 @ 0x7f9d42c37280] Max level: 0.000115
    
[Parsed_astats_0 @ 0x7f9d42c37280] Min difference: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Max difference: 0.000077
    
[Parsed_astats_0 @ 0x7f9d42c37280] Mean difference: 0.000017
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS difference: 0.000022
    
[Parsed_astats_0 @ 0x7f9d42c37280] Peak level dB: -78.752617
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS level dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS peak dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS trough dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] Crest factor: 3.126627
    
[Parsed_astats_0 @ 0x7f9d42c37280] Flat factor: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Peak count: 2
    
[Parsed_astats_0 @ 0x7f9d42c37280] Bit depth: 32/32
    
[Parsed_astats_0 @ 0x7f9d42c37280] Dynamic range: 76.274252
    
[Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings: 246
    
[Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings rate: 0.222624
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of NaNs: 0
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of Infs: 0
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of denormals: 0
    
[Parsed_astats_0 @ 0x7f9d42c37280] Channel: 2
    
[Parsed_astats_0 @ 0x7f9d42c37280] DC offset: 0.000001
    
[Parsed_astats_0 @ 0x7f9d42c37280] Min level: -0.000106
    
[Parsed_astats_0 @ 0x7f9d42c37280] Max level: 0.000115
    
[Parsed_astats_0 @ 0x7f9d42c37280] Min difference: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Max difference: 0.000077
    
[Parsed_astats_0 @ 0x7f9d42c37280] Mean difference: 0.000017
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS difference: 0.000022
    
[Parsed_astats_0 @ 0x7f9d42c37280] Peak level dB: -78.752617
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS level dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS peak dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS trough dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] Crest factor: 3.126627
    
[Parsed_astats_0 @ 0x7f9d42c37280] Flat factor: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Peak count: 2
    
[Parsed_astats_0 @ 0x7f9d42c37280] Bit depth: 32/32
    
[Parsed_astats_0 @ 0x7f9d42c37280] Dynamic range: 76.274252
    
[Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings: 246
    
[Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings rate: 0.222624
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of NaNs: 0
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of Infs: 0
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of denormals: 0
    
[Parsed_astats_0 @ 0x7f9d42c37280] Overall
    
[Parsed_astats_0 @ 0x7f9d42c37280] DC offset: 0.000001
    
[Parsed_astats_0 @ 0x7f9d42c37280] Min level: -0.000106
    
[Parsed_astats_0 @ 0x7f9d42c37280] Max level: 0.000115
    
[Parsed_astats_0 @ 0x7f9d42c37280] Min difference: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Max difference: 0.000077
    
[Parsed_astats_0 @ 0x7f9d42c37280] Mean difference: 0.000017
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS difference: 0.000022
    
[Parsed_astats_0 @ 0x7f9d42c37280] Peak level dB: -78.752617
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS level dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS peak dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] RMS trough dB: -88.654138
    
[Parsed_astats_0 @ 0x7f9d42c37280] Flat factor: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Peak count: 2.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Bit depth: 32/32
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of samples: 1105
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of NaNs: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of Infs: 0.000000
    
[Parsed_astats_0 @ 0x7f9d42c37280] Number of denormals: 0.000000

  • Controlling ffmpeg at runtime with zmq

    3 avril 2023, par Gavin

    I want to dynamically change the rectilinear view (eg its yaw) of a 360 video as it plays.

    


    basic command

    


    To take a 360 video and show a flat/normal view at a yaw perspective of 60 degrees

    


    ffmpeg -i input360.mp4 -vf "v360=input=e:rectilinear:yaw=60,scale=iw/4:-1" out60.mp4
This works fine.

    


    Changing the yaw during playback

    


    I understand ffmpeg has two methods to change filter params at runtime ; sendcmd (file based) and zmq (message based)

    


    I got sendcmd method working, but am struggling to understand zmq syntax and use. ffmpeg's zmq docs are pretty sparse.
I am using a local Windows 10 PC

    


    sendcmd

    


    ffplay -i input360.mp4 -vf "sendcmd=f=cmd.txt,v360=input=e:rectilinear:reset_rot=1,scale=iw/4:-1"

    


    with a cmd.txt file

    


    0-5 [expr] v360 yaw 'lerp(0,90,TI)';
5-10 [expr] v360 yaw 'lerp(90,0,TI)';


    


    result : yaw changes from 0 to 90 degrees from t=0-5s and then 90 to 0 degrees from t=5-10s. Perfect

    


    zmq

    


    ffplay -i input360.mp4 -vf "v360=input=e:rectilinear:reset_rot=1,zmq,scale=iw/4:-1"

    


    I got zmqsend from ffmpeg-tools.zip and added to my ffmpeg bin directory

    


      


    1. execute above ffplay command from terminal window #1 - and see video playing

      


      2. 


    2. Open terminal window #2 and execute : echo v360 yaw 90 > zmqsend

      


      3. 


    


    result : no change to video yaw. No errors either

    


    What am I doing wrong ? Im not sure if my ffmpeg command is wrong, or if my zmq message does not reach ffmpeg (or both). I checked my ffmpeg v2022-10-10 config has —enable-libzmq

    


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