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• How to ffmpeg - encode a video for the web ?

  23 août 2014, par Michael Heuberger

  the videos I currently encode with ffmpeg for the web have a problem : I cannot repeat these in a loop nor jump to a scene. They only can be played once and that’s it !

  Maybe I have to add some more parameters ? Not sure which ones.

  I am encoding the videos into MP4 and WebM both so that they can be played in all browsers within the <video></video> element. This with the nodejs module ttps ://github.com/fluent-ffmpeg/node-fluent-ffmpeg. Here an example of the command for the WebM version only :

  ffmpeg -r 14.713847936548586 -f image2 -pix_fmt yuv420p -i /home/michael.heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/11e4-2a94-058ed290-9c13-4572b2c7aa99/frames/%d.webp -y -an -vcodec libvpx -b:v 386k -deadline realtime -cpu-used 5 -crf 4 /home/michael.heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/11e4-2a94-058ed290-9c13-4572b2c7aa99/videomail_preview.webm

  Any clues are very welcome !

• how to use FFMPEG to transcode h264 to h265 on Ubuntu 12.04 ?

  13 avril 2021, par ching

  I am ching.

  


  I use the following command to transcode h264 to h265.

  


  ffmpeg -i input.mp4 -c:v libx265 -crf 26 -preset fast -c:a aac -b:a 128k output.mp4


  


  But the result is

  


  


  Unknown encoder 'libx265'

  


  


  But I have compiled h265 by the following command before using the above command.

  


  sudo apt-get install cmake mercurial
cd ~/ffmpeg_sources
hg clone https://bitbucket.org/multicoreware/x265
cd ~/ffmpeg_sources/x265/build/linux
PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED:bool=off ../../source
make
make install


  


  Then, I use ffmpeg -codecs to check if it supports to encode h265.

  


  The result is

  


  


  D.V.L. hevc H.265 / HEVC (High Efficiency Video Coding)

  


  


  It seems that ffmpeg does not support h265.

  


  How can I solve this problem ?

  


• How to make all the edit in just one command ?

  2 août 2023, par bartche

  I'm new to ffmpeng so perdon me if it is a stupid question but I've been trying to put these 2 lines together and everytime it show me some different error.

  


  Command that runs first :

  


  ffmpeg -i input.mp4 -filter_complex pad="in_w:in_h+150:0:0",subtitles="subtitle.srt:force_style='Fontsize=24,PrimaryColour=&H000CCFF&,Bold,Shadow=12'" -vcodec libx264 output.mp4


  


  Command that runs second :

  


  ffmpeg -i output.mp4 -i input2.mp4 -filter_complex "[1][0]scale2ref=iw:iw*(1/2)[sat][ep];[ep][sat]vstack",pad="in_w:in_h+240:0:-120",drawtext="fontfile=/home/ubuntu/test/rhumasinera.ttf:text='My Text Here':fontcolor=red:fontsize=82:x=15:y=30",drawtext="fontfile=/home/ubuntu/test/rhumasinera.ttf:text='My Text Here':fontcolor=red:fontsize=82:x=15:y=880" -vcodec libx264 output2.mp4


  


  Not sure what I'm doing wrong since it works running the commands separateded. Wanting to do just in one code to make it faster.