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• FFmpeg library does not want to images into video

  27 avril 2021, par ArtisticBytes

  I am trying to create image folder with 600 images with file names : animation_010000.jpg to animation_010600.jpg (so animation_010000.jpg, animation_010001.jpg, animation_010002.jpg, and all the way to animation_010600.jpg) into a video file, but somehow FFmpeg does not see the path right. What I am doing wrong ?
I tried 4 different samples still the same error in the input path.

  


  ffmpeg -r 60  -s 1920x1080 -i "animation_010%03d.jpg" -vcodec libx264 -crf 25  -pix_fmt yuv420p "test.mp4"


  


  or

  


  ffmpeg -r 60  -s 1920x1080 -i "animation_010%3d.jpg" -vcodec libx264 -crf 25  -pix_fmt yuv420p "test.mp4"


  


  or

  


  ffmpeg -r 60  -s 1920x1080 -i "animation_%06d.jpg" -vcodec libx264 -crf 25  -pix_fmt yuv420p "test.mp4"


  


  or

  


  ffmpeg -r 60  -s 1920x1080 -i "animation_%6d.jpg" -vcodec libx264 -crf 25  -pix_fmt yuv420p "test.mp4"


  


  Keep in mind that input path of the folder is F:/AnimationImages/ but I am not using the full path address instead of I installed all the FFmpeg library into the folder with the images. Also, keep in mind that it converts a single image file as input into a video file as output without any errors. I am pretty sure that answer in input path formatting - so what I am doing wrong ? My OS is Windows 10 and I am using cmd.exe with administrator rights. Thanks guys.

  


• Cut, concatenate, and re-encode to h265 with ffmpeg

  30 mars 2022, par Make42

  I have two h264 videos that I would like to cut (each), concatenate and re-code into h265 - all with ffmpeg. How can I achieve that, considering that the following two approaches do not work ?

  


  First approach

  


  I tried

  


  ffmpeg -ss 00:00:05.500 -to 00:12:06.200 -i video1.mp4 \
       -ss 00:00:10.700 -to 01:43:47.000 -i video2.mp4 \
       -filter_complex "[0:v][0:a][1:v][1:a] concat=n=2:v=1:a=1 [outv] [outa]" \
       -map "[outv]" -map "[outa]" \
       -c:v libx265 -vtag hvc1 -c:a copy \
       final.mp4


  


  but get the error message

  


  


  Streamcopy requested for output stream 0:1, which is fed from a complex filtergraph. Filtering and streamcopy cannot be used together.

  


  


  Second approach

  


  Alternatively, I created the file cutpoints.txt with the content

  


  file video1.mp4
inpoint 5.5
outpoint 726.2
file video2.mp4
inpoint 600.7
outpoint 6227.0


  


  and ran the command

  


  ffmpeg -f concat -safe 0 -i cutpoints.txt -c:v libx265 -vtag hvc1 -c:a copy final.mp4


  


  but then the video does not start exactly at 5.5 seconds, which is not surprising since

  


  


  inpoint timestamp

  


  This directive works best with intra frame codecs, because for non-intra frame ones you will usually get extra packets before the actual In point and the decoded content will most likely contain frames before In point too.

  


  


• lavd/v4l2 : detect device name truncation

  25 novembre 2021, par Anton Khirnov

  lavd/v4l2 : detect device name truncation
  Silences the following warning with gcc 10 :
  
  src/libavdevice/v4l2.c : In function ‘v4l2_get_device_list’ :
  
  src/libavdevice/v4l2.c:1042:64 : warning : ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 251 [-Wformat-truncation=]
  
   1042 |         ret = snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name) ;
  
        |                                                                ^ 
  
  src/libavdevice/v4l2.c:1042:15 : note : ‘snprintf’ output between 6 and 261 bytes into a destination of size 256
  
   1042 |         ret = snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name) ;
  
        |               ^ 
  Previous patches intending to silence it have proposed increasing the
  
  buffer size, but doing that correctly seems to be tricky. Failing on
  
  truncation is simpler and just as effective (as excessively long device
  
  names are unlikely).
  

  • [DH] libavdevice/v4l2.c