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• Cut, concatenate, and re-encode to h265 with ffmpeg

  30 mars 2022, par Make42

  I have two h264 videos that I would like to cut (each), concatenate and re-code into h265 - all with ffmpeg. How can I achieve that, considering that the following two approaches do not work ?

  


  First approach

  


  I tried

  


  ffmpeg -ss 00:00:05.500 -to 00:12:06.200 -i video1.mp4 \
       -ss 00:00:10.700 -to 01:43:47.000 -i video2.mp4 \
       -filter_complex "[0:v][0:a][1:v][1:a] concat=n=2:v=1:a=1 [outv] [outa]" \
       -map "[outv]" -map "[outa]" \
       -c:v libx265 -vtag hvc1 -c:a copy \
       final.mp4


  


  but get the error message

  


  


  Streamcopy requested for output stream 0:1, which is fed from a complex filtergraph. Filtering and streamcopy cannot be used together.

  


  


  Second approach

  


  Alternatively, I created the file cutpoints.txt with the content

  


  file video1.mp4
inpoint 5.5
outpoint 726.2
file video2.mp4
inpoint 600.7
outpoint 6227.0


  


  and ran the command

  


  ffmpeg -f concat -safe 0 -i cutpoints.txt -c:v libx265 -vtag hvc1 -c:a copy final.mp4


  


  but then the video does not start exactly at 5.5 seconds, which is not surprising since

  


  


  inpoint timestamp

  


  This directive works best with intra frame codecs, because for non-intra frame ones you will usually get extra packets before the actual In point and the decoded content will most likely contain frames before In point too.

  


  


• FFMPEG with moviepy

  5 novembre 2023, par Shenhav Mor

  I'm working on something that concatenate videos and adds some titles on through moviepy.

  


  As I saw on the web and on my on pc moviepy works on the CPU and takes a lot of time to save(render) a movie. Is there a way to improve the speed by running the writing of moviepy on GPU ? Like using FFmpeg or something like this ?

  


  I didn't find an answer to that on the web, so I hope that some of you can help me.
I tried using thread=4 and thread=16 but they are still very very slow and didn't change much.

  


  My CPU is very strong (i7 10700k), but still, rendering on moviepy takes me for a compilation with a total of 8 minutes 40 seconds, which is a lot.

  


  Any ideas ?Thanks !
the code doesnt realy matter but :

  


  def Edit_Clips(self):

    clips = []

    time=0.0
    for i,filename in enumerate(os.listdir(self.path)):
        if filename.endswith(".mp4"):
            tempVideo=VideoFileClip(self.path + "\\" + filename)

            txt = TextClip(txt=self.arrNames[i], font='Amiri-regular',
                           color='white', fontsize=70)
            txt_col = txt.on_color(size=(tempVideo.w + txt.w, txt.h - 10),
                                   color=(0, 0, 0), pos=(6, 'center'), col_opacity=0.6)

            w, h = moviesize = tempVideo.size
            txt_mov = txt_col.set_pos(lambda t: (max(w / 30, int(w - 0.5 * w * t)),
                                                 max(5 * h / 6, int(100 * t))))

            sub=txt_mov.subclip(time,time+4)
            time = time + tempVideo.duration

            final=CompositeVideoClip([tempVideo,sub])

            clips.append(final)

    video = concatenate_videoclips(clips, method='compose')
    print("after")
    video.write_videofile(self.targetPath+"\\"+'test.mp4',threads=16,audio_fps=44100,codec = 'libx264')


  


• How to convert 7sec Video to Gif Android

  21 août 2014, par Donnie Ibiyemi

  Am making an app that convert shot video clips to Gif. i was wondering if there was a libary that directly converts videos to gifs on the Fly on Android.

  I’ve tried to extract all the frames of the video and encode them into a gif but am only getting the the first frame of the video. my code is below :

           public static final int GIF_DELAY_BETWEEN_FRAMES = 100;  
  
           public static final float SPEED_RATIO = 1.1f; 
  
  
  
           Uri videoFileUri=Uri.parse(mOutputFile.toString());
  
          FFmpegMediaMetadataRetriever retriever = new FFmpegMediaMetadataRetriever();
  
          retriever.setDataSource(mOutputFile.getAbsolutePath());
  
           rev = new ArrayList<bitmap>();
  
          MediaPlayer mp = MediaPlayer.create(RecorderActivity.this, videoFileUri);
  
           int millis = mp.getDuration();
  
           for(int i=1000000;itest.gif");
  
              outStream.write(generateGIF());
  
              outStream.close();
  
           }catch(Exception e){
  
              e.printStackTrace();
  
           }
  
  
  
  
  
          public byte[] generateGIF() {
  
          ByteArrayOutputStream bos = new ByteArrayOutputStream();
  
          AnimatedGifEncoder encoder = new AnimatedGifEncoder();
  
          encoder.setDelay((int)(GIF_DELAY_BETWEEN_FRAMES * (1 / SPEED_RATIO)));
  
          encoder.start(bos);
  
          for (Bitmap bitmap : rev) {
  
              encoder.addFrame(bitmap);
  
          }
  
          encoder.finish();
  
          return bos.toByteArray();
  
       }
  
  </bitmap>

  Please help me guys...thanks