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• AVI @ Non-monotonous DTS in output stream 0:0 off by one frame

  28 septembre 2023, par Nikki

  I'm trying to record a quick 3 second video on a high FPS usb camera but as you can see in the error message, the first frame and everyone other one is off by 1.

  


  Any ideas what is causing this ?

  


  Call

  


  ffmpeg -rtbufsize 500M -f dshow -vcodec mjpeg -video_device_number 0 -i video="HD USB Camera" -c copy -q:v 1 -t 00:00:03 test.avi


  


  Log :

  


  [avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing to 1. This may result in incorrect timestamps in the output file.
[avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 1, current: 0; changing to 2. This may result in incorrect timestamps in the output file.
[avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 2, current: 0; changing to 3. This may result in incorrect timestamps in the output file.
[avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 8, current: 8; changing to 9. This may result in incorrect timestamps in the output file.
[avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 9, current: 8; changing to 10. This may result in incorrect timestamps in the output file.
[avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 10, current: 8; changing to 11. This may result in incorrect timestamps in the output file.
...
[avi @ 000001eb79eede40] Non-monotonous DTS in output stream 0:0; previous: 1533, current: 1531; changing to 1534. This may result in incorrect timestamps in the output file.


  


• Why i get permission denied at docker ffmpeg execution

  24 octobre 2022, par Daniel Richter

  i want to make small gifs (miniclip) from a mp4 video using ffmpeg with php script in aws ecs.

  


  The whole configuration is working with the symfony built-in server. Now i put the controller into local docker and now i get the following permission denied error :

  


  ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers built with gcc 11.2.1 
(Alpine 11.2.1_git20220219) 20220219 configuration: --prefix=/usr --enable-avfilter -- 
enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libpulse -- 
enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 -- 
enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-lto --enable-postproc -- 
enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-librist --enable- 
libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static -- 
disable-librtmp --enable-libaom --enable-libopus --enable-libsoxr --enable-libwebp -- 
enable-vaapi --enable-vdpau --enable-vulkan --enable-libdrm --disable-debug 
libavutil 57. 17.100 / 57. 17.100 
libavcodec 59. 18.100 / 59. 18.100 
libavformat 59. 16.100 / 59. 16.100 
libavdevice 59. 4.100 / 59. 4.100 
libavfilter 8. 24.100 / 8. 24.100 
libswscale 6. 4.100 / 6. 4.100 
libswresample 4. 3.100 / 4. 3.100 
libpostproc 56. 3.100 / 56. 3.100 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, 
from 'https://vendery-streaming.fra1.cdn.digitaloceanspaces.com/myvideo.mp4': Metadata: major_brand : isom minor_version : 512 
compatible_brands: isomiso2avc1mp41 
encoder : Lavf58.24.101 Duration: 00:18:10.37, start: 0.000000, 
bitrate: 3405 kb/s Stream #0:0[0x1](und): 
Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 540x960, 3331 kb/s, 30 
fps, 30 tbr, 15360 tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] 
Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, 
fltp, 69 kb/s (default) 
Metadata: handler_name : 
SoundHandler vendor_id : [0][0][0][0] /var/www/html/public/myimage.gif: Permission denied


  


  What exactly tells me the error ? The folder /var/www/html/public/ exists but isnt writable ?

  


  The command from php i run the script is :

  


  $output = shell_exec('/usr/bin/ffmpeg -y -ss 255 -t 4 -i '.$url.' -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 /var/www/html/public/'.$outputFile.' 2>&1');
echo $output;


  


  any idea is welcome.

  


  

  1. the user is wrong. shell_exec('whoami'); gives me www-data, but why ?? My dockerfile have the following in : RUN chown -R root:root /var/www/html/public

  


  


  docker-compose.yaml

  


  symfony:
    mem_limit: 500M
    mem_reservation: 500M
    container_name: '${APP_NAME}-${APP_ENV}-backend'
    #environment:
        #- DATABASE_URL="mysql://${MYSQL_USER}:${MYSQL_PASS}@database/${MYSQL_DB}?serverVersion=mariadb-10.8.3"
    build:
        context: .
        target: symfony
    #restart: unless-stopped
    ports:
        - 8000:8000 #browser / container


  


• ffmpeg recording audio / video sync issues [closed]

  1er novembre 2022, par sling jones

  I'm using ffmpeg to record NTSC analog video on Linux Fedora 36 using a Blackmagic Intensity Pro 4K for video and a Scarlett 2i2 for audio. I'm using a TBC to avoid dropped frames and to ensure a constant S-Video Y/C framerate on the analog end.

  


  The problem I'm running into is that on playback the audio will start out relatively in sync with the video at the beginning of the captured file but will eventually run ahead of the video eventually becoming many seconds off.

  


  Nothing I do seems to change this or change the degree to which it happens. The audio and video stay in sync throughout the entire video as I'm monitoring the source so I don't understand how they can diverge so much once encoded into a digital file ?

  


  Here is the command I am using :

  


  ffmpeg -hwaccel cuda -fflags +igndts -format_code ntsc -f decklink -raw_format auto -vsync passthrough -rtbufsize 1500M -thread_queue_size 512 -i 'Intensity Pro 4K' -f pulse -rtbufsize 500M -thread_queue_size 512 -i 'Scarlett 2i2 Camera Analog Stereo' -c copy -map 0:1 -map 1:0 "/tmp/ffmpeg-raw/file-raw.avi"


  


  here's the ffprobe output from one of my files :

  


  Input #0, avi, from 'test2-raw.avi':
  Metadata:
    software        : Lavf59.33.100
  Duration: 00:11:42.87, start: 0.000000, bitrate: 169341 kb/s
  Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x486, 167801 kb/s, 59.94 fps, 59.94 tbr, 59.94 tbn
  Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s



  


  As you can see in my code snippet, I've been throwing things at the wall for a bit. I've tried different rtbufsizes, adding -copyts, and going through the different -vsync options. I've tried it with and without hardware acceleration ( I do have a NVIDIA card), +igdts did get rid of a warning but did not help with the sync, as did changing the thread queue sizes.

  


  OBS can do this, why can't I ?