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• How to record audio and video on macos with ffmpeg ?

  5 janvier 2024, par chovy

  $ ffmpeg -f avfoundation -list_devices true -i ""
...
[AVFoundation indev @ 0x7fa8c24312c0] AVFoundation video devices:
[AVFoundation indev @ 0x7fa8c24312c0] [0] FaceTime HD Camera
[AVFoundation indev @ 0x7fa8c24312c0] [1] Capture screen 0
[AVFoundation indev @ 0x7fa8c24312c0] AVFoundation audio devices:
[AVFoundation indev @ 0x7fa8c24312c0] [0] MacBook Pro Microphone


  


  These are my audio and video devices.
I'm trying to record audio from mic and video capture of screen.
However when I try to run the command I get this error :

  


  $ ffmpeg -f avfoundation -i "1:0"  \             
  ~/Videos/screencast.mp4
ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --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-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[AVFoundation indev @ 0x7fced1c315c0] Configuration of video device failed, falling back to default.
[avfoundation @ 0x7fced2009000] Selected pixel format (yuv420p) is not supported by the input device.
[avfoundation @ 0x7fced2009000] Supported pixel formats:
[avfoundation @ 0x7fced2009000]   uyvy422
[avfoundation @ 0x7fced2009000]   yuyv422
[avfoundation @ 0x7fced2009000]   nv12
[avfoundation @ 0x7fced2009000]   0rgb
[avfoundation @ 0x7fced2009000]   bgr0
[avfoundation @ 0x7fced2009000] Overriding selected pixel format to use uyvy422 instead.


  


  Additionally I'd like to capture camera in lower right. This is how I do it on Linux, but the basics don't even work on MacOS.

  


  screencap() {
  file=`date +%Y-%m-%d-%H.%M.%S`
  ffmpeg -f alsa -i pulse -f x11grab -thread_queue_size 64 -i :0.0 \
  -video_size 384x216 -i /dev/video0 \
        -filter_complex 'overlay=main_w-overlay_w:main_h-overlay_h' \
  -r 60 -preset ultrafast ~/Videos/screencast-${file}.mp4
}


  


• Pydub AudioSegment.from_file() fails for mp3 audio file : Decoding failed. ffmpeg returned error code : 1,

  27 mars 2021, par Nisuga Jayawardana

  Couldn't find any fix. Looks like a bug. How to fix this ?

  


      # Grab the file from the request
    file_uploaded = request.FILES.get('sourceFile')
    file_path = uploads_base_path + file_uploaded.name
    
    # saving the uploaded file
    open(file_path, 'wb')

    extension = file_uploaded.name.split('.')[-1]
    with open(file_path, "rb") as wav_file:
        audio_segment = AudioSegment.from_file(wav_file, format=extension)    <-------------Error

    # create .wav filename for the file
    wavFileName = uploads_base_path + 'out.wav'
    print(wavFileName)

    # convert audio file to .wav type
    audio_segment.export(wavFileName,"wav")


  


  // Pydub Error
  
Decoding failed. ffmpeg returned error code : 1
  
Output from ffmpeg/avlib :
  
ffmpeg version N-101739-gcad3a5d715 Copyright (c) 2000-2021 the FFmpeg developers
  
built with gcc 9.3-win32 (GCC) 20200320

  


  // FFMPEG Error
  
[cache @ 000001c52157fdc0] Inner protocol failed to seekback end : -40
  
Last message repeated 1 times
  
[mp3 @ 000001c52157f400] Failed to read frame size : Could not seek to 1026.
  
[cache @ 000001c52157fdc0] Statistics, cache hits:0 cache misses:0
  
cache:pipe:0 : Invalid argument

  


• Extracted .wav file from .mp4 video with ffmpeg only has half of the duration

  16 mars 2021, par TheSprinter

  I've been using ffmpeg to extract .wav files from .mp4 videos to then generate waveforms and spectrograms for it, but I stumbled upon a file for which ffmpeg does not generate the full audio file. The video duration is 25:25 (25 minutes and 25 seconds), but the .wav file is 12:28 (12 minutes and 28 seconds).

  


  This is what I've been doing :

  


  C:\Users\<user>> ffmpeg -i video.mp4 -ab 160k -ac 1 -ar 44100 -vn audio.wav&#xA;</user>

  


  I tried with -ac 2 only to see if I get something different, but the result is the same. In fact, I can't generate the plots I need with a stereo audio file.

  


  This is what I get in the terminal when I run the command :

  


  C:\Users\<user>>ffmpeg -i video.mp4 -ab 160k -ac 1 -ar 44100 -vn audio.wav&#xA;ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers&#xA;  built with gcc 9.3.1 (GCC) 20200621&#xA;  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-libsrt --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-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf&#xA;  libavutil      56. 51.100 / 56. 51.100&#xA;  libavcodec     58. 91.100 / 58. 91.100&#xA;  libavformat    58. 45.100 / 58. 45.100&#xA;  libavdevice    58. 10.100 / 58. 10.100&#xA;  libavfilter     7. 85.100 /  7. 85.100&#xA;  libswscale      5.  7.100 /  5.  7.100&#xA;  libswresample   3.  7.100 /  3.  7.100&#xA;  libpostproc    55.  7.100 / 55.  7.100&#xA;Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#x27;audio.mp4&#x27;:&#xA;  Metadata:&#xA;    major_brand     : mp42&#xA;    minor_version   : 0&#xA;    compatible_brands: mp42mp41&#xA;    creation_time   : 2021-03-09T05:00:00.000000Z&#xA;  Duration: 00:25:25.29, start: 0.000000, bitrate: 2308 kb/s&#xA;    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 4410 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)&#xA;    Metadata:&#xA;      creation_time   : 2021-03-09T05:00:00.000000Z&#xA;      handler_name    : ?Mainconcept Video Media Handler&#xA;      encoder         : AVC Coding&#xA;    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 253 kb/s (default)&#xA;    Metadata:&#xA;      creation_time   : 2021-03-09T05:00:00.000000Z&#xA;      handler_name    : #Mainconcept MP4 Sound Media Handler&#xA;Stream mapping:&#xA;  Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native))&#xA;Press [q] to stop, [?] for help&#xA;Output #0, wav, to &#x27;audio.wav&#x27;:&#xA;  Metadata:&#xA;    major_brand     : mp42&#xA;    minor_version   : 0&#xA;    compatible_brands: mp42mp41&#xA;    ISFT            : Lavf58.45.100&#xA;    Stream #0:0(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s (default)&#xA;    Metadata:&#xA;      creation_time   : 2021-03-09T05:00:00.000000Z&#xA;      handler_name    : #Mainconcept MP4 Sound Media Handler&#xA;      encoder         : Lavc58.91.100 pcm_s16le&#xA;size=   64463kB time=00:12:28.41 bitrate= 705.6kbits/s speed= 156x&#xA;video:0kB audio:64463kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000118%&#xA;</user>

  


  If this information on the video is not enough to troubleshoot, the video says the following (when it starts, for the first few seconds) :

  


  
EP TRT (23.976): 01:24:53:18
EP TRT (29.976): 01:24:55:06

AUDIO LAYOUT

Channel 1: Left Front (L)
Channel 2: Right Front (R)
Channel 3: Center (C)
Channel 4: Low Frequency/Effects (LFE)
Channel 5: Left Surround (Ls)
Channel 6: Right Surround (Rs)
Channel 7: Mono Mix (L)
Channel 8: Mono Mix (R)


  


  This is for TV, that's why you see that longer duration. I don't know if all this is relevant, actually.

  


  Some additional info

  


  Something curious is that I'm doing this for manual tests, but I'm actually creating an app with python and, for that, I'm using python-ffmpeg module, and I with that I'm getting the correct .wav file (with the correct duration). The python lines for this are the following :

  


  (
                        ffmpeg
                        .input(
                            
                        )
                        .output(
                            ,
                            audio_bitrate=316000,
                            ac=1,
                            ar=48000
                        )
                        .run()
)