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• 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 ?

• Extract audio with ffmpeg, linux

  13 mai 2019, par Puffin

  I’m trying to extract audio tracks from some Avi videos and save them to their own files, ideally without re-encoding.

  I’ve had a look through here https://www.ffmpeg.org/ffmpeg.html#Audio-Options and here ffmpeg to extract audio from video though I’m getting errors regardless of the approach I try.

  My latest command string is :

  ffmpeg -i /home/d/Pictures/Test/input-video.AVI -map 0:a -vn -acodec copy /home/d/Pictures/Test/output-audio.m4a

  The key part of the output is :

  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, avi, from '/home/d/Pictures/Test/input-video.AVI':
  
    Duration: 00:00:05.94, start: 0.000000, bitrate: 18131 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 17995 kb/s, 30.28 fps, 30.28 tbr, 30.28 tbn, 30.28 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 11025 Hz, 1 channels, s16, 176 kb/s
  
  File '/home/d/Pictures/Test/output-audio.m4a' already exists. Overwrite ? [y/N] y
  
  [ipod @ 0x1d89520] Codec for stream 0 does not use global headers but container format requires global headers
  
  [ipod @ 0x1d89520] Could not find tag for codec pcm_s16le in stream #0, codec not currently supported in container
  
  Output #0, ipod, to '/home/d/Pictures/Test/output-audio.m4a':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 11025 Hz, mono, 176 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

  I’m believe I have got the right audio stream number from this output and thus am assuming the "-map 0:a" part isn’t the problem.

  I’m running on Linux Mint 18.1

• Revision 50f944272c : vp10 : do sub8x8 block reconstruction in full subblocks. This means that we don'

  8 septembre 2015, par Ronald S. Bultje

  Changed Paths :
   Modify /vp10/common/reconinter.c

  
   Modify /vp10/decoder/decodeframe.c

  
  
  vp10 : do sub8x8 block reconstruction in full subblocks.

  This means that we don’t reconstruct in 4x4 dimensions, but in
  blocksize dimensions, e.g. 4x8 or 8x4. This may in some cases lead
  to performance improvements. Also, if we decide to re-introduce
  scalable coding support, this would fix the fact that you need to
  re-scale the MV halfway the block in sub8x8 non-4x4 blocks.

  See issue 1013.

  Change-Id : If39c890cad20dff96635720d8c75b910cafac495