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• Copy multiple sections of an .mp3 file to a new .mp3 file with ffmpeg [duplicate]

  28 août 2021, par Nemo XXX

  I'd like to copy multiple sections of an .mp3 file to a new .mp3 file using a single ffmpeg command.
For example, I only want to keep the following sections of a 60 minute .mp3 file :

  


  00:00:55 00:05:34 00:04:39 || 55.7173 334.888 279.17069999999995
00:16:31 00:38:29 00:21:57 || 991.912 2309.11 1317.198
00:41:29 00:45:04 00:03:34 || 2489.84 2704.37 214.52999999999975


  


  (The values are start, end, duration.)

  


  How can I achieve this with a single ffmpeg command on a Windows machine ?
(I already know how to create 3 separate .mp3 files and to concatenate them.)

  


• ffmpeg exit status -1094995529

  13 août 2021, par Matt Joiner

  I'm developing an application that makes calls to ffprobe that return the unorthodox exit status of -1094995529 for certain files when on Windows. This exit status is given consistently, and there is some minor discussion of this.

  


  Why is this value given, and where is it documented ? Can I expect this status to be different on a unix machine where the allowed exit statuses are more constrained ?

  


• Why can't I duplicate an MJPEG stream from a webcam to a V4L2 Loopback Device on Linux ?

  17 août 2021, par Chris White

  I'm trying to duplicate a USB webcam device V4L2 stream (/dev/video0) to a V4L2 Loopback Device (/dev/video99) at the highest resolution and framerate possible with the hardware available on a Raspberry Pi 4 running the latest Raspbian (also the minimum CPU load). I'm using FFMPEG version 7:4.1.6-1 deb10u1+rpt2 and v4l2loopback version 0.12.5.1.

  


  The output from :
ffmpeg -f v4l2 -list_formats all -i /dev/video0 gives me the following :

  


  [video4linux2,v4l2 @ 0xc1e1c0] Compressed:       mjpeg :          Motion-JPEG : 1600x1200 3264x2448 2592x1944 2048x1536 1280x960 1024x768 800x600 640x480 320x240 1600x1200
[video4linux2,v4l2 @ 0xc1e1c0] Raw       :     yuyv422 :           YUYV 4:2:2 : 1600x1200 3264x2448 2592x1944 2048x1536 1280x960 1024x768 800x600 640x480 320x240 1600x1200


  


  3264x2448px is the native CCD resolution, and the image is being used for machine vision purposes, so I'd like to use this maximum resolution at the highest framerate I can. The reason for the loopback device is so that I can view/stream the videofeed (with GStreamer) and take high resolution PNG snapshots simultaneously, using the command ffmpeg -f v4l2 -video_size 3264x2448 -i /dev/video99 -frames 1 capture.png -y From my understanding this means there is an MJPEG stream at this resolution and according to the command v4l2-ctl -d /dev/video0 --list-formats-ext I can manage 15fps :

  


  ioctl: VIDIOC_ENUM_FMT
    Type: Video Capture

    [0]: 'MJPG' (Motion-JPEG, compressed)
        Size: Discrete 1600x1200
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
        Size: Discrete 3264x2448
            Interval: Discrete 0.067s (15.000 fps)
        Size: Discrete 2592x1944
            Interval: Discrete 0.067s (15.000 fps)
        Size: Discrete 2048x1536
            Interval: Discrete 0.067s (15.000 fps)
        Size: Discrete 1280x960
            Interval: Discrete 0.067s (15.000 fps)
        Size: Discrete 1024x768
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 800x600
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 640x480
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 320x240
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1600x1200
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
    [1]: 'YUYV' (YUYV 4:2:2)
        Size: Discrete 1600x1200
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 3264x2448
            Interval: Discrete 0.500s (2.000 fps)
        Size: Discrete 2592x1944
            Interval: Discrete 0.333s (3.000 fps)
        Size: Discrete 2048x1536
            Interval: Discrete 0.333s (3.000 fps)
        Size: Discrete 1280x960
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1024x768
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 800x600
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 640x480
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 320x240
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1600x1200
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.100s (10.000 fps)


  


  I feel like I've tried every possible version of GStreamer/FFMPEG command to achieve this and have had varying success, but more often than not I come up against "av_interleaved_write_frame() : Cannot allocate memory" or some issue with converting M-JPEG to rawvideo for the loopback device...

  


  What command should I be using ? I'm at the end of my tether !

  


  I've tried :

  


  gst-launch-1.0 v4l2src device=/dev/video0 ! "image/jpeg,width=3264,height=2448,framerate=15/1" ! avdec_mjpeg ! "video/x-raw,format=YUY2,width=3264,height=2448,framerate=15/1" ! v4l2sink device=/dev/video99


  


  and

  


  ffmpeg -f v4l2 -video_size 3264x2448 -i /dev/video0 -vcodec rawvideo -pix_fmt yuyv422 -r 1 -f v4l2 /dev/video99


  


  (EDIT) gives :

  


  ffmpeg version 4.1.6-1~deb10u1+rpt2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/usr --extra-version='1~deb10u1+rpt2' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 14226.770484, bitrate: 255688 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 3264x2448, 255688 kb/s, 2 fps, 2 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, video4linux2,v4l2, to '/dev/video99':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 3264x2448, q=2-31, 127844 kb/s, 1 fps, 1 tbn, 1 tbc
    Metadata:
      encoder         : Lavc58.35.100 rawvideo
av_interleaved_write_frame(): Cannot allocate memory
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=15.8x    
video:15606kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!


  


  and

  


  ffmpeg -f v4l2 -video_size 3264x2448 -i /dev/video0 -vcodec rawvideo -pix_fmt yuv420p -r 15 -f v4l2 /dev/video99


  


  (EDIT) gives :

  


  ffmpeg version 4.1.6-1~deb10u1+rpt2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/usr --extra-version='1~deb10u1+rpt2' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 13704.103283, bitrate: 255688 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 3264x2448, 255688 kb/s, 2 fps, 2 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, video4linux2,v4l2, to '/dev/video99':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 3264x2448, q=2-31, 1438248 kb/s, 15 fps, 15 tbn, 15 tbc
    Metadata:
      encoder         : Lavc58.35.100 rawvideo
av_interleaved_write_frame(): Cannot allocate memory
    Last message repeated 7 times
frame=    8 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.53 bitrate=N/A dup=7 drop=0 speed=1.37x    
video:93636kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!


  


  and

  


  ffmpeg -f v4l2 -input_format mjpeg -i /dev/video0 -vcodec copy -f v4l2 /dev/video99


  


  (EDIT) gives :

  


  ffmpeg version 4.1.6-1~deb10u1+rpt2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/usr --extra-version='1~deb10u1+rpt2' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
[mjpeg @ 0xdb5240] EOI missing, emulating
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 12511.425271, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 3264x2448, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
[video4linux2,v4l2 @ 0xdb7f10] V4L2 output device supports only a single raw video stream
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
    Last message repeated 1 times


  


  I'm not sure what to troubleshoot next - looking at available memory, there's no problem, so what am I doing wrong ? This copy of the feed is the last piece of the puzzle...