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• FFMPEG Images to video - 'file not found' error in command - I'm sure it's something obvious

  8 août 2017, par jgads

  I’m running this command on my Android phone with an FFmpeg library. It works great for combining videos into one resultant video, but not with images. Here’s the command :

   -framerate 4 -start_number 0 -i '/storage/emulated/0/Pictures/phototest/%3d.jpg' -c:v libx264 -r 30 -pix_fmt yuv420p /storage/emulated/0/Pictures/phototest/result.mp4

  The error is :

  '/storage/emulated/0/Pictures/phototest/%3d.jpg': No such file or directory

  The images are just consecutively named, e.g. 1.jpg, 2.jpg and so on, and they’re definitely there - though I think FFMPEG is taking the image file name literally rather than interpreting it. I’m missing something obvious here, I’m sure of it. I looked round StackOverflow and the whole ’%3d’ wildcard is supposed to work ! Any ideas ?

  EDIT : Running the command with just the first image (1.jpg) works fine. Definitely an issue with the wildcard. In addition, running the command without the image path in quotes doesn’t seem to work either.

  EDIT 2 : Adding ’img’ in front of every file so that it it’s ’img1.jpg’, ’img2.jpg’ and so on doesn’t work either. Is there a way to pass multiple images separated by ’|’ like the concat command ?

• FFMPEG Images to video - 'file not found' error in command - I'm sure it's something obvious

  12 décembre 2014, par jgads

  I’m running this command on my Android phone with an FFmpeg library. It works great for combining videos into one resultant video, but not with images. Here’s the command :

   -framerate 4 -start_number 0 -i '/storage/emulated/0/Pictures/phototest/%3d.jpg' -c:v libx264 -r 30 -pix_fmt yuv420p /storage/emulated/0/Pictures/phototest/result.mp4

  The error is :

  '/storage/emulated/0/Pictures/phototest/%3d.jpg': No such file or directory

  The images are just consecutively named, e.g. 1.jpg, 2.jpg and so on, and they’re definitely there - though I think FFMPEG is taking the image file name literally rather than interpreting it. I’m missing something obvious here, I’m sure of it. I looked round StackOverflow and the whole ’%3d’ wildcard is supposed to work ! Any ideas ?

  EDIT : Running the command with just the first image (1.jpg) works fine. Definitely an issue with the wildcard. In addition, running the command without the image path in quotes doesn’t seem to work either.

  EDIT 2 : Adding ’img’ in front of every file so that it it’s ’img1.jpg’, ’img2.jpg’ and so on doesn’t work either. Is there a way to pass multiple images separated by ’|’ like the concat command ?

• Reduce relative latency on ffmpeg video mosaic filter

  23 juin 2016, par Luke E

  I’m working a Google Cardboard project which involves a 3D video captured from two webcams being combined into a single stream by ffmpeg and then streamed to an android phone. I’ve created a custom complex filter to do everything I need in ffmpeg, however, I’ve found that the latency between the videos is very high — there’s is almost a second of lag between the left video and the right. Does anyone know if there’s a way to synchronize the two ? Even if it means just delaying the faster stream. Thanks a ton, and below is the command I’m using.

  ffmpeg -f dshow -video_device_number 0 -i video="Logitech HD Pro Webcam C920" -f dshow -video_device_number 1 -i video="Logitech HD Pro Webcam C920" -filter_complex "[0:v]setpts=PTS-STARTPTS[c];[1:v]setpts=PTS-STARTPTS[d];[c]crop=320:480[b];[d]crop=320:480[int3];[b]transpose=2[a];[int3]transpose=1[int2];[a]pad=iw*2:ih[int]; [int][int2]overlay=W/2:0[vid]" -map [vid] -pix_fmt yuv420p -r 100 -an -vcodec libx264 -preset ultrafast -tune zerolatency -threads 8 -thread_type slice -f mpegts udp://192.168.43.1:1234

  P.S I apologize for the odd complex filter formatting, very early one morning I decided to re-order it to see if I could somehow synchronize the video streams that way, but obviously that was a stupid idea :) And I believe the PTS commands only do something useful for video files, but I left them in anyway.