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• How to use the —abr-ladder from x265 on ffmpeg

  14 septembre 2020, par Diego

  I'm trying to find out how to use the latest x265 abr-ladder option on ffmpeg, which promises up to 65% time savings compared to sequential generation, according to release notes, but : (1) I'm not sure if it is already available on ffmpeg or how to find out, and if it is (2) specifying the input/output inside the configuration file instead of the ffmpeg CLI causes ffmpeg to complain that required parameters are missing.

  


  In the x265 repository there is a example for configuration file, but I couldn't find there or in the ffmpeg repository instructions on how to use this kind of parameter that doesn't seem to follow the CLI standards for ffmpeg. Apparently it is possible to create multiple outputs in a single command using ffmpeg, but again I couldn't make it work.

  


  So what I'm looking for is a usage example for the --abr-ladder parameter for x265. Thank you.

  


• Data URI or Base64 string as input to ffmpeg command

  18 août 2022, par Alok

  I can easily convert my media from one format to other using ffmpeg
  
ffmpeg -i input_file.ogg -acodec flac output_file.flac

  


  In place of input file I want to use Data URI or Base64 string as input file. I saw one example
  
ffmpeg -i "data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=" smiley.png given at https://ffmpeg.org/ffmpeg-all.html

  


  I tried this example for my audio conversion.
  
ffmpeg -i "data:audio/ogg; codecs=opus;base64,GkXfo59ChoEBQveBAULygQR...trimmed" -acodec flac /tmp/alok.flac

  


  When I run script having this command I see error
  
./ffmpeg.sh: line 1: /usr/bin/ffmpeg: Argument list too long

  


  How can I make this conversion work ? How can I use Base64 data as input to ffmpeg command ?

  


• Download RTSP recording content between two dates and times, or from start seconds to end seconds

  23 septembre 2022, par holt2

  I need to download from an RTSP link the content recorded on an IP camera from a start and end date and time. It would also be valid to be able to download it from X seconds of start of the recording to seconds of end.

  


  With this ffmpeg command I download the recording content from the RTSP link only from the beginning of the recording content, with the duration in seconds passed by the -t parameter :

  


  ffmpeg -rtsp_transport tcp -i  -r 30 -t <seconds> -y -vf scale=800:-1 -c:v libx264 -crf 20 -preset fast -c:a aac -strict experimental -b:a 192k -ac 2 /path/to/video/filename.mp4&#xA;</seconds>

  


  I tried to download with ffmpeg the content using temporary media fragment URIs (https://www.w3.org/2008/WebVideo/Fragments/wiki/UA_Server_RTSP_Communication#.281.29_Temporal_Media_Fragment_URIs) but it doesn't do it correctly :

  


  ffmpeg -rtsp_transport tcp -i #t=10,20 -r 30 -y -vf scale=800:-1 -c:v libx264 -crf 20 -preset fast -c:a aac -strict experimental -b:a 192k -ac 2 -ss 19:09:13 -t 5 /path/to/video/filename.mp4


  


  I have also tried with ffmpeg to use the -ss parameter to try to extract the recording from a specific hour, minute and second (https://trac.ffmpeg.org/wiki/Seeking) but when running it gets stuck, it does not advance :

  


  ffmpeg -rtsp_transport tcp -i  -r 30 -y -vf scale=800:-1 -c:v libx264 -crf 20 -preset fast -c:a aac -strict experimental -b:a 192k -ac 2 -ss 19:09:13 -t <seconds> /path/to/video/filename.mp4&#xA;</seconds>

  


  In case it's helpful, to get the RTSP link, I'm using the ONVIF protocol with a NodeJS library (https://github.com/agsh/onvif). I have also reviewed the ONVIF documentation available but have not found a way to download recorded content between start and end dates and times.

  


  Do you know how to download from an RTSP link the content recorded on an IP camera from a start date and time and end date, or download it from X seconds of recording start to seconds of end ?

  


  I am also open to use other tools or commands that can do this.