Recherche avancée

Sur d’autres sites (7905)

• FFMPEG FFBROBE Get Frame Count On Powershell [duplicate]

  27 avril 2020, par ilham zacky

  I am new to FFmpeg, I have some audio and video files, I need to get the duration with frames, I need it in this format H:M:S:F - "00:00:00:00", I am using Powershell

  



  currently, my duration works, but instead of frames, it prints a decimal value.
note : in my output maximum number of frames should be 30

  



  This is my code

  



  $audioId = "$id.m4a"
$videoId = "$id.mp4"

$duration1 = if ((ffprobe -i $audioId 2>&1 | Out-String) -match 'Duration:\s+([\d:"."]+)') { $matches[1] };

$duration = if ((ffmpeg -i $videoId 2>&1 | Out-String) -match 'Duration:\s+([\d:"."]+)') { $matches[1] };

$newduration1 = ("$duration1").Replace(".",":")
$newduration = ("$duration").Replace(".",":")

echo $duration1 
echo $duration



  



  my output be like

  



  00:00:03.48
00:00:03.46



  


• Frame-by-frame video decoding and processing on Android

  22 octobre 2016, par Jason M

  I am working on a project to decode a recorded video on Android into yuv420sp frames with API17 for processing. I have implemented it on Win and iOS with ffmpeg and native api for decoding, respectively. Now I want to reuse the same c++ processing code on Android API17, but found difficulty. I saw straight API to do that in API21, but sadly I have to keep that better compatibility.

  At first, I tried to make the best use of APIs of hardware decoding (following MediaCodec get all frames from video and some others) but found that the data in the outputbuffer does not match that described by the format. For example, I have 1920x1080 frames decoded into yuv420sp but found that y channel actually span 1928x1080. Since I had similar headaches working with still image capturing that was never worked out(YUV image taken from takePicture not match defined format), I am not sure if I may ever solve this.

  Later, I tried to go back to ffmpeg but found most building guides either out of date(for ffmpeg 2.x) or a little hard to understand(such as http://writingminds.github.io/ffmpeg-android/, where they do provide nice pre-built binaries but no instructions on using it. Maybe I should download the sources and use the headers there ?).

  Any suggestions ?

• Is there any library in python or can we use FFMPEG to detect the appearance of the lines pattern in video that is shown in the image attached below ? [closed]

  21 septembre 2022, par Shreyas R

  Video defect appearing frame

  


  Hi All,

  


  I am trying to find a way to detect the appearance of this lines pattern embedded in the link below.
If I get any match of this pattern in a video, I need to record that particular timestamp of the video where I got the pattern match.

  


  My idea is to take the image and compare it against the video to find for approximate match percentage. If I get it, then I record that particular timestamp within a .txt file.

  


  Is there any better way to achieve this ?
I think we can use Python or FFMPEG video filters to get a solution for this.

  


  It would really help if anyone can support with a solution. Thanks

  


  Update :
I got a reference where they have proposed a solution similar to my concern.

  


  https://aws.amazon.com/blogs/media/metfc-automatically-compare-two-videos-to-find-common-content/

  


  So we can try to achieve some output from this solution.