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• How to add a scrolling text of the audio file song name on a sepecific part of a video and stream it to youtube using ffmpeg

  5 novembre 2022, par Youssef Lasheen

  I know this is s very long and specific question but it can be broken down to these points :

  


  

  • How to add a text of song name on video

  


  • How to scroll in a specific area not from the beginning of the video to the end

  


  • How to stream a looping video and loop through multiple audio files to youtube/twitch.

  


  


  I kinda got the third point but i think its not an elegant solution

  


  ffmpeg -re -stream_loop -1 -i back.gif -safe 0 -i mylist.txt -c copy -map 0:v:0 -map 1:a:0 -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k \ -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 \ -ar 44100  -f flv rtmp://live.twitch.tv/app/$key

  


  I also found this script that adds a scrolling image (input.jpg) to specific aree of a video but i coudlnt integrate it with the script above

  


  ffmpeg -y -ignore_loop 0 -r 25 -i back.gif -loop 1 -r 25 -i input.jpg -filter_complex "[0:v]crop=270:257:360:55[c0];[c0][1:v]overlay=y='257-t*257*0.04':eof_action=endall[fg];[0:v][fg]overlay=x=360:y=55:eof_action=endall" -t 50 output.mp4

  


• The phenomenon of missing video data for the first part 1 to 2 seconds in streaming

  22 novembre 2022, par 양관식

  The phenomenon of missing video data for the first part (1 to 2 seconds) in streaming - ffmpeg
(specific hls live streaming, intermittent occurrence)
( I'm using it to check the frame (fps) )

  


  [root@ ]# ffmpeg -i http://live_streaming_url/PATH/definst/sample.stream/playlist.m3u8 -t 1 -f null -
frame= 5 fps=0.0 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=23.3x
video:3kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  ---

  


  When monitoring is performed by setting it to -t 10 (playtime), about 1 second of the first part is omitted, and only the frames for the next 9 seconds are added up
There is a phenomenon that is measured.

  


  [root@streaming_monitoring_test ~]# ffmpeg -i http://live_streaming_url/PATH/_definst_/sample.stream/playlist.m3u8 -t 10 -f null -
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 7 (GCC)
  configuration: --enable-demuxer=dash --enable-libxml2
**frame=  277 fps=134 q=-0.0 Lsize=N/A time=00:00:10.00 bitrate=N/A speed=4.84x    
video:145kB audio:1875kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown**

------------------------------------------------------------------------------------------------------



  


  The reason for missing video data in the front part is under investigation
As a solution, the problem seems to be resolved when monitoring is carried out by adjusting the playback start time (-ss).

  


  ffmpeg -i http://live_streaming_url/PATH/definst/sample.stream/playlist.m3u8 -ss 10 -t 1 -f null –
frame= 29 fps=7.2 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=0.249x
  
video:15kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  ---

  


  but.... Why is the video data missing for the first part (1 to 2 seconds) checked ?

  


  thankyou...

  


• ffmpeg how to convert an existing mp4 to mpeg-4 part 14 ?

  30 novembre 2022, par Micha

  I need a video to comply with the following specifications

  


  

  • Container : MOV or MP4 (MPEG-4 Part 14), no edit lists, moov atom at the front of the file.

  


  • Audio codec : AAC, 48khz sample rate maximum, 1 or 2 channels (mono or stereo).

  


  • Video codec : HEVC or H264, progressive scan, closed GOP, 4:2:0 chroma subsampling.

  


  • Frame rate : 23-60 FPS.

  


  • Picture size :

    

    • Maximum columns (horizontal pixels) : 1920

    


    • Required aspect ratio is between 0.01:1 and 10:1 but we recommend 9:16 to avoid cropping or blank spaces.

    


    


  


  • Video bitrate : VBR, 25Mbps maximum

  


  • Audio bitrate : 128kbps

  


  • Duration : 15 mins maximum, 3 seconds minimum

  


  • File size : 1GB maximum

  


  


  I cannot get to work. So far I have tried the following :

  


  ffmpeg -i input.mp4 -c:v libx264 -aspect 16:9 -crf 18 -vf "scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw)/2:(720-ih)/2" -fpsmax 60 -preset ultrafast -c:a aac -b:a 128k -ac 1 -pix_fmt yuv420p -movflags +faststart -t 59 -y output.mp4

  


  I always end up with MPEG-4 Part 10.