Recherche avancée

Sur d’autres sites (9962)

• Remove flicker, crop and upscale in ffmpeg

  22 août 2024, par Sabha

  I spent one full day on ffmpeg line commands by searching a lot on google but could not achieve what I wanted to and therefore I came here to seek some advice.
I have a video testinput.mpg which I believe is a mpeg-2 video. It is of 720x576 dimensions having 25 fps and a total bitrate of 4224 kbps

  


  First problem is that the exported footage is flickering which I wasn't able to remove using ffmpeg with lots of commands I tried like adjusting brightness, contrast, hue, saturation and all.

  


  Second problem was to extract the center portion which I was able to do it with the crop feature using following command.

  


  ffmpeg -i testinput.mpg -filter:v "crop=468:374" testoutput.mpg


  


  But after cropping I observed that that bitrate fell from 4224 kbps to 761 kbps and I assume this has reduced the quality of video.

  


  What I want to achieve is :

  


  

  1. Crop the video properly keeping the same quality (acodec copy vcodec copy) -> ffmpeg did not allow me to do both the things together (cropping and having same codec)

  


  2. Remove the flicker from video and upscale it to 4K or HD quality so that it looks nice on big televison (preferably 4K)

  


  


  I request some help on how to achieve the desired result. Can someone shed some light on it ?

  


  Here are 10 seconds sample videos on google drive that I am working on

  


  testinput.mpg

  


  testoutput.mpg

  


  Thanks

  


• Can you call out to FFMPEG in a Firebase Cloud Function

  27 juillet 2024, par Dave Parks

  Per the Firebase Cloud Functions documentation, you can leverage ImageMagick from within a cloud function : https://firebase.google.com/docs/functions/use-cases

  



  Is it possible do something similar but call out to FFMPEG instead of ImageMagick ? While thumbnailing images is great, I'd also like the capability to append incoming images to a video file stored out on Firebase Storage.

  


• Java, FfMPEG : Gson not found even though it's there.

  19 avril 2018, par We are Borg

  I am working on a Spring-MVC application in which we are using FFProbe to get media information. Unfortunately, it’s not working on our live instance. We have ffmpeg & ffprobe installed on same path. The error we get is GSON is not foudn, although we have it.

  Error log :

  Caused by: 
  
  java.lang.NoSuchMethodError: com.google.gson.Gson.<init>(Lcom/google/gson/internal/Excluder;Lcom/google/gson/FieldNamingStrategy;Ljava/util/Map;ZZZZZZLcom/goo
  
  gle/gson/LongSerializationPolicy;Ljava/util/List;)V
  
          at com.google.gson.GsonBuilder.create(GsonBuilder.java:545)
  
          at net.bramp.ffmpeg.FFmpegUtils.setupGson(FFmpegUtils.java:124)
  
          at net.bramp.ffmpeg.FFmpegUtils.<clinit>(FFmpegUtils.java:23)
  
          at net.bramp.ffmpeg.FFprobe.<clinit>(FFprobe.java:29)
  
  </clinit></clinit></init>

  POM.xml :

   <repositories>
  
          <repository>
  
              <id>apache.snapshots</id>
  
              <name>Apache Development Snapshot Repository</name>
  
              <url>https://repository.apache.org/content/repositories/snapshots/</url>
  
              <releases>
  
                  <enabled>false</enabled>
  
              </releases>
  
              <snapshots>
  
                  <enabled>true</enabled>
  
              </snapshots>
  
          </repository>
  
          <repository>
  
              <id>jitpack.io</id>
  
              <url>https://jitpack.io</url>
  
          </repository>
  
      </repositories>
  
      <parent>
  
          <groupid>io.spring.platform</groupid>
  
          <artifactid>platform-bom</artifactid>
  
          <version>2.0.8.RELEASE</version>
  
          <relativepath></relativepath>
  
  
  
      </parent>
  
      <dependencies>
  
  
  
          
  
          <dependency>
  
              <groupid>net.bramp.ffmpeg</groupid>
  
              <artifactid>ffmpeg</artifactid>
  
              <version>0.6.2</version>
  
          </dependency>
  
  
  
    <dependency>
  
              <groupid>com.google.code.gson</groupid>
  
              <artifactid>gson</artifactid>
  
          </dependency>
  
  </dependencies>

  Usage :

  Error thrown on first line.
  
  FFprobe ffprobe = new FFprobe("/usr/bin/ffprobe");
  
  FFmpegProbeResult probeResult = ffprobe.probe(filePath);

  I can confirm that ffprobe file is available on /usr/bin. What am I doing wrong here ? Thank you.