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• Rescalling or dynamic scalling images in Ffmpeg in a video

  23 janvier 2021, par najam ulhassan

  I tried to create a video using multiple images having different scales or sizes or (height*widths) using Mobile-FFmpeg #
  
I am using this code script to get the required result :

  


  val filterStringBuilder1 = StringBuilder()<br />&#xA;filterStringBuilder1.append(listOfImages)<br />&#xA;filterStringBuilder1.append("-filter_complex ")<br />&#xA;filterStringBuilder1.append(<br />&#xA;            "[0:v]scale=100:140:force_original_aspect_ratio=decrease,pad=100:140:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=out:st=4:d=1[v0];" &#x2B;<br />&#xA;            "[1:v]scale=180:120:force_original_aspect_ratio=decrease,pad=180:120:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v1];" &#x2B;<br />&#xA;            "[2:v]scale=120:180:force_original_aspect_ratio=decrease,pad=120:180:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v2];" &#x2B;<br />&#xA;            "[v0][v1][v2]concat=n=3:v=1:a=0,format=yuv420p[v]")<br />&#xA;    filterStringBuilder1.append(" -map")<br />&#xA;    filterStringBuilder1.append(" [v] ")<br />&#xA;    filterStringBuilder1.append("-aspect 16:9 ")<br />&#xA;    filterStringBuilder1.append(finalVideo.absolutePath)<br />&#xA;    FFmpeg.execute(filterStringBuilder1.toString())<br />&#xA;

  

  
But finding following logcat error :

  


   E/mobile-ffmpeg: [Parsed_concat_14 @ 0x748fc98bc0] <br />&#xA; E/mobile-ffmpeg: Input link in1:v0 parameters (size 180x120, SAR 1:1) do not match the corresponding <br />output link in0:v0 parameters (100x140, SAR 1:1)<br />&#xA; E/mobile-ffmpeg: [Parsed_concat_14 @ 0x748fc98bc0] <br />&#xA; E/mobile-ffmpeg: Failed to configure output pad on Parsed_concat_14<br />&#xA; E/mobile-ffmpeg: Error reinitializing filters!<br />&#xA; E/mobile-ffmpeg: Failed to inject frame into filter network: Invalid argument<br />&#xA; E/mobile-ffmpeg: Error while processing the decoded data for stream #2:0<br />&#xA;

  


• Create dynamic audio broadcast stream (node, ffmpeg, ..?)

  24 mars 2021, par TheCrunkiee

  I have coded a videoboard. Like a soundboard but with video. You go to one URL that's just a black screen and another one which has a list of different videos (sender). When you click one of these videos it plays on the black screen (receiver). If you play 2 different videos at the same time both videos are shown next to each other on the receiver. That's working fine for several months now. It just creates multiple html video-elements with multiple source-tags (x265 mp4 and vp9 webm).

  


  I recently made a discord bot which takes the webm, extracts the opus stream and plays its sound in the voice channel where the bot is connected. This has one disadvantage : It can only play one sound at a time. It happens a lot that there are multiple videos/sounds playing at the same time so this a bit of a bummer.

  


  So I thought I should create a audiostream on the server which hosts the videoboard and just connect the bot to that stream. But I have no clue how to do this. All I know is that it's very likely going to involve ffmpeg.

  


  What would be the best option here ? What I think I would need is basically an infinite silence stream and the possibility to add a audio file onto that stream at any point which will play simultaneously with other audio files that were added before and have not ended payback yet. How is that possible ? Somehow with m3u8 playlist-files or via rtsp protocol ?

  


  Thanks :)

  


• FFMPEG unable to loop overlay input image for dynamic image overlay

  15 septembre 2017, par Mahi

  I am trying to loop an image in images/logo.png(for ex).

  I am using php laravel to create dynamic images and overwriting it into images/logo.png.

  My ffmpeg code

  ffmpeg -y -listen 1 -i rtmp://192.168.33.11:1935/live/mp4test  -loop 1  -f image2 -i image/logo.png -filter_complex "[0:v]scale=1024:-1,setpts=PTS-STARTPTS[stream];[1:v]scale=120:-1,setpts=PTS-STARTPTS[logo] ; [stream][logo]overlay=W-w-10:H-h-10,format=yuv420p[out]" -map "[out]" -map 0:a:0 -hls_time 10 -hls_list_size 6 -start_number 1 stream.m3u8

  This code works fine if I generate dynamic image using

  until test ; do convert -size 200x100 xc:White -gravity Center  -weight 700 -pointsize 12  -annotate 0 "<code>date" /usr/local/nginx/html/stream/test_stream/datex.png ; mv /usr/local/nginx/html/stream/test_stream/datex.png /usr/local/nginx/html/stream/test_stream/image/logo.png ; sleep 1 ; done

  This script just generates a image with current time stamp and moves it into images/ as logo.png . And this works absolutely fine.

  But when I using my laravel application generate a file move it into images/ ffmpeg starts dropping all the frames.

  Please suggest me a solution.