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• ffmpeg v4l2 combine incoming odd and even fields comming from v4l2

  3 août 2022, par Нияз Фаттахов

  I have a alternating PAL signal comming from video decoder 720x240@50fps.
I need to combine incomming odd and even fields using ffmpeg, so I could get 720x480@25fps
I'm using embedded arm chip cortex-a7 width hardware encoder, so I have constrained cpu-resourses.

  


  At the moment I can write PAL video by using this command :

  


  ffmpeg -f v4l2 -r 50 -t 5 -s 720x240 -i /dev/video0 -pix_fmt uyvy422 -c:v h264_omx /mnt/output_240p.avi -y


  


  But I get 720x240@50.

  


  To get 720x480@25fps, I tried this :

  


  ffmpeg -f v4l2 -r 50 -t 5 -s 720x240 -pix_fmt uyvy422 -i /dev/video0  -vf "fieldorder=bff" -r 25 -pix_fmt uyvy422 -s:v 720x480 -c:v h264_omx /mnt/output_480p.avi -y


  


  ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Buildroot 2021.11)
  configuration: --enable-cross-compile --cross-prefix=/home/niyaz/lichee-pi-zero/buildroot-2021.11[ 2673.495744] tvp5150 0-005c: width = 720, height = 240
/output/host/bin/arm-buildroot-linux-gnueabihf- --sysroot=/home/[ 2673.511300] tvp5150 0-005c: Set video std register to 4.
niyaz/lichee-pi-zero/buildroot-2021.11/output/host/arm-buildroot[ 2673.517724] tvp5150 0-005c: mbus_type: 1
-linux-gnueabihf/sysroot --host-cc=/usr/bin/gcc --arch=arm --tar[ 2673.527575] tvp5150 0-005c: V4L2_MBUS_PARALLEL
get-os=linux --disable-stripping --pkg-config=/home/niyaz/lichee-pi-zero/buildroot-2021.11/output/host/bin/pkg-config --disable-static --enable-shared --prefix=/usr --enable-avfilter --disable-version3 --enable-logging --enable-optimizations --disable-extra-warnings --enable-avdevice --enable-avcodec --enable-avformat --enable-network --disable-gray --enable-swscale-alpha --disable-small --enable-dct --enable-fft --enable-mdct --enable-rdft --disable-crystalhd --disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables --disable-mipsdsp --disable-mipsdspr2 --disable-msa --enable-hwaccels --disable-cuda --disable-cuvid --disable-nvenc --disable-avisynth --disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libvo-amrwbenc --disable-symver --disable-doc --disable-gpl --disable-nonfree --enable-ffmpeg --disable-ffplay --enable-libv4l2 --disable-avresample --disable-ffprobe --disable-libxcb --disable-postproc --disable-swscale --disable-encoders --enable-encoder=h264_omx --disable-decoders --enable-decoder='rawvideo,012v,v210,v210x,yuv4' --disable-muxers --enable-muxer='avi,mp4,rtp,rtsp' --disable-demuxers --disable-protocols --enable-protocol='file,rtp,tcp,udp,pipe' --enable-indevs --disable-alsa --enable-outdevs --enable-pthreads --enable-zlib --disable-bzlib --disable-libfdk-aac --disable-libcdio --disable-gnutls --enable-openssl --disable-libdrm --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-mmal --disable-omx --disable-omx-rpi --disable-libopencv --disable-libopus --disable-libvpx --disable-libass --disable-libbluray --disable-libmfx --disable-librtmp --disable-libmp3lame --disable-libmodplug --disable-libspeex --disable-libtheora --disable-iconv --enable-libfreetype --disable-fontconfig --disable-libopenjpeg --disable-libx264 --disable-libx265 --disable-libdav1d --disable-x86asm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --enable-armv6 --enable-vfp --enable-neon --disable-altivec --extra-libs=-latomic --enable-pic --cpu=cortex-a7 --enable-omx
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswresample   3.  9.100 /  3.  9.100
[video4linux2,v4l2 @ 0x510440] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device
[video4linux2,v4l2 @ 0x510440] Time per frame unknown
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 2673.553994, bitrate: N/A
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x240, 50 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_omx))
Press [q] to stop, [?] for help
Output pad "default" with type video of the filter instance "Parsed_fieldorder_0" of fieldorder not connected to any destination
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
[video4linux2,v4l2 @ 0x510440] Some buffers are still owned by the caller on close.
ioctl(VIDIOC_QBUF): Bad file descriptor
Conversion failed!
#


  


  Is it possible to combine incoming odds and even fields from v4l2 without cpu load ?

  


• How to ffmpeg a PNG image sequence in multiple subdirs to one mp4 ?

  17 août 2021, par MikeEcho

  I am trying desperately to get this working.

  


  I have multiple files in the format of : lago_20210817_1200.png, lago_20210817_1201.png and so on.

  


  I am having a folder for each day of the year. eg. lago_20210817_1200.png is the folder 2021, subfolder 08, subfolder 17.

  


  I have tried many different approaches :

  


  

  • ffmpeg -f concat -i filelist.txt -r 25 output.mp4

  


  • ffmpeg -f concat -i <(find '/home/user/lago/2021/08/*.png') -r 25 output.mp4

  &#xA;

  &#xA;

  But no approach seems to work !

  &#xA;

  I tried to create a filelist with :

  &#xA;

  find . -name '*.png' -exec echo "file '{}'" \;|sort -h|sort


  &#xA;

  the result looked promising

  &#xA;

  file './lago_20210813_1959.png'
file './lago_20210813_2000.png'
file './lago_20210813_2001.png'


  &#xA;

  I am getting very different error messages...

  &#xA;

  DTS -230584300921369, next:40000 st:0 invalid dropping
PTS -230584300921369, next:40000 invalid dropping st:0
DTS -230584300921369, next:40000 st:0 invalid dropping


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  or

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  [concat @ 0x562531fe6c80] Unsafe file name './lago_20210813_2155.png'


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  Could anyone lead me in the right direction, i am desperate.

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  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --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-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  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


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• Python FFMPEG Heroku|Remove audio from video with Byte to Byte. No web processes running Error on Heroku

  15 mai 2021, par samoel

  I'm trying to get a .mp4 file from an address and remove the sound from it.I also want the data sent to FFMPEG to be bytes and return the result in byte

  &#xA;

  i tried different command for my code like using -movflags frag_keyframe+empty_moov.&#xA;When I run this code in Heroku and receive the log...

  &#xA;

  Buildpacks on Heroku are :

  &#xA;

  https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest.git

  &#xA;

  https://github.com/codeinteger6/heroku-buildpack-libopus.git

  &#xA;

  git ://github.com/heroku/heroku-buildpack-python.git

  &#xA;

  def from_bytes_to_byte(input_bytes):
    command = f"ffmpeg -f mp4 -i /dev/stdin -vcodec copy -an -f mp4 -movflags frag_keyframe+empty_moov -"
    convert_cmd = subprocess.Popen(
        shlex.split(command),
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE,
        shell=False
    )
    b = b''
    convert_cmd.stdin.write(input_bytes)
    convert_cmd.stdin.close()
    while True:
        output = convert_cmd.stdout.read()
        if len(output) > 0:
            b += output
        else:
            error_msg = convert_cmd.poll()
            if error_msg is not None:
                break
    print("----------FINISHED------------")
    return b


result=requests.get("https://file-examples-com.github.io/uploads/2017/04/file_example_MP4_480_1_5MG.mp4") #.MP4 File
byterecieved=from_bytes_to_byte(result.content)


  &#xA;

  heroku logs :

  &#xA;

  ffmpeg version N-57204-gc7c138e411-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 8 (Debian 8.3.0-6)
configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
libavutil      57.  0.100 / 57.  0.100
libavcodec     59.  0.100 / 59.  0.100
libavformat    59.  0.100 / 59.  0.100
libavdevice    59.  0.100 / 59.  0.100
libavfilter     8.  0.101 /  8.  0.101
libswscale      6.  0.100 /  6.  0.100
libswresample   4.  0.100 /  4.  0.100
libpostproc    56.  0.100 / 56.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/dev/stdin':
Metadata:
major_brand     : mp42
minor_version   : 0
compatible_brands: mp42mp41isomavc1
creation_time   : 2015-08-07T09:13:02.000000Z
Duration: 00:00:30.53, start: 0.000000, bitrate: N/A
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 301 kb/s, 30 fps, 30 tbr, 30 tbn (default)
Metadata:
creation_time   : 2015-08-07T09:13:02.000000Z
handler_name    : L-SMASH Video Handler
vendor_id       : [0][0][0][0]
encoder         : AVC Coding
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 112 kb/s (default)
Metadata:
creation_time   : 2015-08-07T09:13:02.000000Z
handler_name    : L-SMASH Audio Handler
vendor_id       : [0][0][0][0]
Output #0, mp4, to 'pipe:':
Metadata:
major_brand     : mp42
minor_version   : 0
compatible_brands: mp42mp41isomavc1
encoder         : Lavf59.0.100
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], q=2-31, 301 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
Metadata:
creation_time   : 2015-08-07T09:13:02.000000Z
handler_name    : L-SMASH Video Handler
vendor_id       : [0][0][0][0]
encoder         : AVC Coding
Stream mapping:
**2021-05-14T21:32:09.639203+00:00** app[worker.1]: Stream #0:0 -> #0:0 (copy)
**2021-05-14T22:12:36.527864+00:00** heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/" host=desolate-inlet-50581.herokuapp.com request_id=cc985185-6ba7-4530-95f8-f4512f465039 fwd="5.122.192.170" dyno= connect= service= status=503 bytes= protocol=https
2021-05-14T22:12:37.303089+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/favicon.ico" host=desolate-inlet-50581.herokuapp.com request_id=f26b18a5-30ac-41e2-9b63-8f945b746b12 fwd="5.122.192.170" dyno= connect= service= status=503 bytes= protocol=https
2021-05-14T22:13:39.737155+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/" host=desolate-inlet-50581.herokuapp.com request_id=12a28261-d746-4067-ab4b-05d3e2e8c379 fwd="5.122.192.170" dyno= connect= service= status=503 bytes= protocol=https
2021-05-14T22:13:40.372446+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/favicon.ico" host=desolate-inlet-50581.herokuapp.com request_id=c2e2ebc8-9fb2-4d30-8876-2fede3dfd141 fwd="5.122.192.170" dyno= connect= service= status=503 bytes= protocol=https


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