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• How to use the information from ffprobe to use with ffmpeg. Is there a shortcut to the syntax ?

  20 novembre 2016, par Margaret Montreux

  Want to batch convert a bunch of different video files from cli instead of Rolands old-and-slow-drag-and-drop-one-file-at-a-time-software. I have used ffprobe in OS X Terminal here. This shows us what the software did to the file and I want to do the same. MJPEG AVI I get but the rest, how would my ffmpeg syntax look to achieve this result efter converting ?

  Example : My ffprobe give me this

  Input #0, avi, from 'P10_0001.AVI':
Metadata:
comment :
encoder : Roland Corporation
Duration: 00:03:17.64, start: 0.000000, bitrate: 16694 kb/s
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 15285 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s

  What would the ffmpeg syntax look like to do this with a new file.

  I’ve been trying some simple ones but those are not accepted by the machine (Edirol p-10) and I hope someone can point me in the right direction. :)

  Edit :
  OK. The syntax I want to do is involving 3 files.

  1. File that has the correct codec and everything to work with the machine. P10_0001.AVI

  2. A file that does not have the correct format (codec etc.) softvision.mpg

  3. A new file just as file 2 but with the codec of file number 1. P10_0002.AVI

• Convert WAV to AIFF with ffmpeg

  12 novembre 2016, par Arete

  How can I convert a wav file to an AIF file with ffmpeg ?

  I need to make various files one in 16 Bit, one in 24 bit and one in 32 Bit.

  I also need to make different sample rates. E.g one in 176,400 kHz and one in 44,100 kHz.

  I know ffmpeg -i input-file.wav output-file.aif will convert the file but I am not sure about the rest.

  https://www.ffmpeg.org/general.html#Audio-Codecs says ffmpeg supports AIFF but there is no documentation on the AIFF encoding : https://en.wikipedia.org/wiki/Audio_Interchange_File_Format#AIFF-C_common_compression_types

• FFMPEG detect color bars and tone in video

  23 novembre 2016, par Chris Harvey

  I am trying to detect if a video has any valid content or is just the standard broadcasting bars & tone. So far I’ve looked at this question : http://superuser.com/questions/1036449/detect-color-bars-ffmpeg/1036478#1036478
  which generates bars & tone from the first frame and then compares that against the rest of the stream but in my case I need to run the ffmpeg command within a folder that only has one file that has already been found by my python script.

  Is it possible to use ffmpeg’s blend=difference to check that a short bars & tone clip is a subclip of one of my video files ? I’m thinking of this in the same way you can check if a string is within a string, or is there a better way to check for bars that I’m not thinking of ?

  Thanks !