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• How to fix this FFMPEG command to record audio as well ?

  19 mai 2018, par James Kowalski

  I am trying to fix this FFMPEG command to record audio.

  I have tried using the parts recommended on the official stackoverflow site but they didn’t work

  Orignal Command

  ffmpeg_stream = '/usr/bin/ffmpeg -f x11grab -s 1280x720 -r 24 -i :%d+nomouse -c:v libx264 -preset superfast -pix_fmt yuv420p -s 1280x720 -threads 0 -f flv "%s"' % (xvfb.new_display, info['destination'])

  Command with attempted audio

  ffmpeg_stream = '/usr/bin/ffmpeg -f x11grab -s 1280x720 -r 24 -i :%d+nomouse -c:v libx264 -preset superfast -pix_fmt yuv420p -s 1280x720 -threads 0 -f alsa -ac 2 -i hw:0 -f flv "%s"' % (xvfb.new_display, info['destination'])

• MP4 to HLS conversion error after resizing video using FFmpeg

  26 juillet 2023, par ITeptIcklyTa

  When trying to create HLS stream from original video, FFmpeg creates HLS stream without errors.

  


  ~ $ ffmpeg -i test.mp4 -f hls -hls_time 3 -hls_segment_filename seg%02d.ts stream.m3u8


  


  But when I resize video using this command, I get a timestamps warning :

  


  ~ $ ffmpeg -i test.mp4 -vf scale=426:240 test_240p.mp4
[mp4 @ 0xb400007429e52d00] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[mp4 @ 0xb400007429e52d00] Encoder did not produce proper pts, making some up.


  


  And when creating HLS stream from resized video, I'm getting an error :

  


  ~ $ ffmpeg -i test_240p.mp4 -f hls -hls_time 3 -hls_segment_filename seg%02d.ts stream.m3u8                     ffmpeg version N-111626-g0ba719f726 Copyright (c) 2000-2023 the FFmpeg developers
  built with clang version 16.0.6
  configuration: --arch=aarch64 --as=aarch64-linux-android-clang --cc=aarch64-linux-android-clang --cxx=aarch64-linux-android-clang++ --nm=llvm-nm --pkg-config=/data/data/com.termux/files/usr/bin/pkg-config --strip=llvm-strip --cross-prefix=aarch64-linux-android- --disable-indevs --disable-outdevs --enable-indev=lavfi --disable-static --disable-symver --enable-cross-compile --enable-gnutls --enable-gpl --enable-jni --enable-lcms2 --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgme --enable-libmp3lame --enable-libopus --enable-librav1e --enable-libsoxr --enable-libsrt --enable-libssh --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-mediacodec --enable-opencl --enable-shared --prefix=/data/data/com.termux/files/usr --target-os=android --extra-libs=-landroid-glob --disable-vulkan --enable-neon --disable-libfdk-aac                                                      libavutil      58. 14.100 / 58. 14.100                  libavcodec     60. 22.100 / 60. 22.100
  libavformat    60. 10.100 / 60. 10.100                  libavdevice    60.  2.101 / 60.  2.101
  libavfilter     9. 10.100 /  9. 10.100
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_240p.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf60.10.100
  Duration: 00:00:10.01, start: 0.000000, bitrate: 178 kb/s
  Stream #0:0[0x1](und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/smpte170m, progressive), 426x240, 44 kb/s, SAR 640:639 DAR 16:9, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 02/24/2023.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.22.100 h264_mediacodec
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 02/24/2023.
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_mediacodec))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[h264_mediacodec @ 0xb400007da1f2ac00] Use 1 as the default MediaFormat i-frame-interval, please set gop_size properly (>= fps)
[h264_mediacodec @ 0xb400007da1f2ac00] Mediacodec encoder doesn't support AV_CODEC_FLAG_GLOBAL_HEADER. Use extract_extradata bsf when necessary.
Output #0, hls, to 'stream.m3u8':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf60.10.100
  Stream #0:0(und): Video: h264, yuv420p(tv, bt709/bt709/smpte170m, progressive), 426x240 [SAR 640:639 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 90k tbn (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 02/24/2023.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.22.100 h264_mediacodec
  Stream #0:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 02/24/2023.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.22.100 aac
frame=    0 fps=0.0 q=0.0 size=N/A time=00:00:00.25 bitr[hls @ 0xb400007da1f27d00] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[hls @ 0xb400007da1f27d00] Encoder did not produce proper pts, making some up.
[mpegts @ 0xb400007da1f29100] H.264 bitstream error, startcode missing, size 0
[hls @ 0xb400007da1f27d00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 3600 >= 3600
[vost#0:0/h264_mediacodec @ 0xb400007da200a000] Error submitting a packet to the muxer: Invalid argument
[out#0/hls @ 0xb400007da1eaa6c0] Error muxing a packet
[hls @ 0xb400007da1f27d00] Opening 'seg00.ts' for writing
[hls @ 0xb400007da1f27d00] Opening 'stream.m3u8.tmp' for writing
[out#0/hls @ 0xb400007da1eaa6c0] video:2kB audio:5kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
frame=    3 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.41 bitrate=N/A speed=3.39x
[aac @ 0xb400007da2051400] Qavg: 32468.840
Conversion failed!
~ $


  


  I tried to build FFmpeg from GitHub and install FFmpeg from repositories, and I'm still getting this error.

  


• ffmpeg intensity histogram adjustment

  30 septembre 2016, par jlarsch

  I am using ffmpeg for background correction of a video and I would like to improve the intensity scaling of the output.

  My gray scale videos have dark moving objects on a light background. In 8 bit pixel intensities, the light background has pixel values around 240, the dark objects have intensities of around 120.

  outside of ffmpeg, I generate a background image by taking the median frame over some number of frames.
  Then, I use ffmpeg to blend/divide each frame by the background image. (I want to use division, not subtraction of the background).
  [there is also some cropping in my ffmpeg command, but it is irrelevant to my question]

  'ffmpeg.exe', '-i', u'inputVideo.avi', '-i', u'bgMed.tif', '-y', '-r', '160', '-filter_complex', "[1:0] setsar=sar=1 [1sared]; [0:0][1sared] blend=all_mode='divide':repeatlast=1,format=gray,split=1 [int1];[int1]crop=1097:1097:12:11:[out1]", '-map', '[out1]', '-c:v', 'libxvid', '-q:v', '5', '-g', '10', u'outputVideo'

  This procedure is basically working but the resulting video frames look too washed out. This is probably expected ? I am guessing ffmpeg does the division and produces an internal float result which it then maps back to an 8 bit output. I would like to stretch the histogram of the result from the division. It would be preferable to stretch before the mapping to 8 bit for a finer dynamic range.

  In my example, I am assuming that the background division produces a result frame that has a value close to 1 for the background, and values close to 0.5 for the dark objects. Then, ffmpeg seems to be mapping the full range 0-1 into 8 bit 0-255. I would like it to map the range 0.5-1 of the division result into the 8 bit range of the output. is this possible somehow ? Or how else can I achieve a similar result ?