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• FFMPEG, the penultimate image from the .txt file doesn't show in the video

  25 octobre 2019, par ArmKh

  I’m trying to create a video from the images using ffmeg. Actually, the creating of the video works but there is a small problem. I have a text file with the names of the images (paths) which I’m using in the video. The file looks like this

  file 'image1.jpg'
  
  file 'image2.jpg'
  
  file 'image3.jpg'
  
  file 'image4.jpg'
  
  file 'image5.jpg'

  And the ffmeg command is following

  ffmpeg -y -r 1/5 -f concat -safe 0 -i imagenames.txt -i some_audio.mp3 -c:v libx264 -vf fps=30 -pix_fmt yuv420p -t 30 output.mp4

  This video should keep the frame on every image for 5 seconds. But the problem is the penultimate image ( image4 in this case ) is not being shown in the video. So, it keeps on image3 10 seconds and moves to image5

  So, the video in seconds looks like this

  [image1] -> [image2] -> [image3] -> [image4] -> [image5]
  5sec        5sec       10sec        0sec        5sec

  And the problem is not with the image4 exactly. In case of swapping image3 and image4, the video will skip image3

  [image1] -> [image2] -> [image4] -> [image3] -> [image5]
  5sec        5sec       10sec        0sec        5sec

  Hope you’ll have any suggestions to fix this issue

• How to use ffmpeg on hardware acceleration with multiple inputs ?

  20 mars 2019, par Cole

  I’m trying to speed up the rendering of a video by using the GPU instead of the CPU. This code works, but I don’t know if I’m doing it correctly.

  ffmpeg -hwaccel cuvid -c:v hevc_cuvid \
  
  -i video.mp4 \
  
  -i logo.png \
  
  -i text.mov \
  
  -c:v h264_nvenc \
  
  -filter_complex " \
  
  [0]scale_npp=1920:1080,hwdownload,format=nv12[bg0]; \
  
  [bg0]trim=0.00:59.460,setpts=PTS-STARTPTS[bg0]; \
  
  [1]scale=150:-1[logo1];[bg0][logo1]overlay=(W-w)-10:(H-h)-10[bg0]; \
  
  [2]scale=500:-1[logo2];[logo2]setpts=PTS-STARTPTS[logo2]; \
  
  [bg0][logo2]overlay=-150:-100[bg0]; \
  
  [bg0]fade=in:00:30,fade=out:1750:30[bg0]" \
  
  -map "[bg0]" -preset fast -y output.mp4 

  I feel like I need to be using hwuplaod somewhere in there, but I’m not totally sure. Any help would be appreciated.

  Log from run :

  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  
    configuration: --enable-gpl --enable-libx264 --enable-cuda --enable-nvenc --enable-cuvid --enable-nonfree --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/ --extra-ldflags=-L/usr/local/cuda/lib64/
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  [hevc @ 0x3eb04c0] vps_num_hrd_parameters -1 is invalid
  
  [hevc @ 0x3eb04c0] VPS 0 does not exist
  
  [hevc @ 0x3eb04c0] SPS 0 does not exist.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.7.100
  
    Duration: 00:00:59.46, start: 0.000000, bitrate: 5894 kb/s
  
      Stream #0:0(und): Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 5891 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #1, png_pipe, from 'logo.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, rgba(pc), 528x128 [SAR 11339:11339 DAR 33:8], 25 tbr, 25 tbn, 25 tbc
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'text.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      encoder         : Lavf57.56.100
  
    Duration: 00:00:06.00, start: 0.000000, bitrate: 1276 kb/s
  
      Stream #2:0(eng): Video: qtrle (rle  / 0x20656C72), bgra, 1920x1080, 1274 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
  
      Metadata:
  
        handler_name    : DataHandler
  
  Stream mapping:
  
    Stream #0:0 (hevc_cuvid) -> scale_npp
  
    Stream #1:0 (png) -> scale
  
    Stream #2:0 (qtrle) -> scale
  
    fade -> Stream #0:0 (h264_nvenc)
  
  Press [q] to stop, [?] for help
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.12.100
  
      Stream #0:0: Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        encoder         : Lavc58.18.100 h264_nvenc
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: -1
  
  frame= 1783 fps=151 q=30.0 Lsize=   15985kB time=00:00:59.45 bitrate=2202.4kbits/s dup=4 drop=0 speed=5.04x    
  
  video:15977kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.050389%

  Not sure what to make of this, pretty new to ffmpeg.

• Lost in converting hardware accelarated ffmpeg decoder to raw loopback device

  5 septembre 2019, par Mikeynl

  Before reaching out, i googled enough, tried many different docker containers, building, compiling etc etc.

  What I am looking for is a hardware accelerated conversion from a rtsp stream to a /dev/video0 device. I have a working v4l2loopback kernel module, and the following command is working :

  ffmpeg -loglevel panic -hide_banner -i "rtsp://192.168.0.17/user=admin&password=&channel=1&stream=0.dsp?real_stream" -f v4l2 -pix_fmt yuv420p /dev/video0

  I can test the /dev/video0 device to take a screenshot :

  ffmpeg -f video4linux2 -i /dev/video0 -ss 0:0:2 -frames 1 /var/www/html/out.png

  Above is working, but taking around 30 / 50% cpu usage to decode/encoding.

  I have a fully working test environment with a GeForce GTX 1050. All cuda / nvidia related drivers are in place. ffmpeg is compiled with the following options :

  configuration: --enable-nonfree --disable-shared --enable-nvenc --enable-cuda --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/cuda/lib64

  My last attempt was :

  ffmpeg -hwaccel cuvid -c:v h264_cuvid -i "rtsp://192.168.0.17/user=admin&password=&channel=1&stream=0.dsp?real_stream" -c:v rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0

  It gives me an error :

  Impossible to convert between the formats supported by the filter ’Parsed_null_0’ and the filter ’auto_scaler_0’
  Error reinitializing filters !
  Failed to inject frame into filter network : Function not implemented
  Error while processing the decoded data for stream #0:0

  I have at the moment absolute no idea anymore how to solve this.

  Thanks in advance !

  //added information

  root@localhost:~# ffmpeg -i "rtsp://192.168.0.17/user=admin&password=&channel=1&stream=0.dsp?real_stream" -c copy -f v4l2 /dev/video0
  
  ffmpeg version N-91067-g1c2e5fc Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  
    configuration: --enable-nonfree --disable-shared --enable-nvenc --enable-cuda --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/cuda/lib64
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 19.101 / 58. 19.101
  
    libavformat    58. 13.102 / 58. 13.102
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 22.100 /  7. 22.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
  Input #0, rtsp, from 'rtsp://192.168.0.17/user=admin&password=&channel=1&stream=0.dsp?real_stream':
  
    Metadata:
  
      title           : RTSP Session
  
    Duration: N/A, start: 2.300000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080, 10 fps, 10 tbr, 90k tbn, 20 tbc
  
  [v4l2 @ 0x31a7f00] 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
  
  root@localhost:~#
  
  
  
  root@localhost:~# ffmpeg -i "rtsp://192.168.0.17/user=admin&password=&channel=1&stream=0.dsp?real_stream" -f v4l2 -pix_fmt yuv420p /dev/video0                   ffmpeg version N-91067-g1c2e5fc Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  
    configuration: --enable-nonfree --disable-shared --enable-nvenc --enable-cuda --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/cuda/lib64
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 19.101 / 58. 19.101
  
    libavformat    58. 13.102 / 58. 13.102
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 22.100 /  7. 22.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
  Input #0, rtsp, from 'rtsp://192.168.0.17/user=admin&password=&channel=1&stream=0.dsp?real_stream':
  
    Metadata:
  
      title           : RTSP Session
  
    Duration: N/A, start: 2.300000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080, 10 fps, 10 tbr, 90k tbn, 20 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x2821240] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, v4l2, to '/dev/video0':
  
    Metadata:
  
      title           : RTSP Session
  
      encoder         : Lavf58.13.102
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, q=2-31, 248832 kb/s, 10 fps, 10 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc58.19.101 rawvideo
  
  frame=   85 fps= 13 q=-0.0 Lsize=N/A time=00:00:08.50 bitrate=N/A dup=0 drop=4 speed=1.31x
  
  video:258188kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown