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• DVD m2v to mp4, Anamorphic to Square Pixels, 640x480 or 720x540 ?

  10 juillet 2018, par Matt McManis

  I want to use FFmpeg to convert an NTSC DVD .m2v file to an .mp4.

  The original resolution is 720x480 4:3 Anamorphic.

  I want to convert for playback on a computer using a player like VLC, with Square Pixels.

  ---

  To preserve the best quality

  Should I convert stretching the height 720x540 ?

  Or shrink the width 640x480 ?

  Or should I leave it Anamorphic 720x480 ?

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  What is the difference between playing Anamorphic and Square Pixels on a computer monitor ?

  Does the media player always stretch the pixels to display correctly if Anamorphic ?

  Does encoding the height stretch from 480 to 540 by FFmpeg improve anything ?

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  FFmpeg

  ffmpeg
  
  
  
  -framerate ntsc 
  
  
  
  -i input.m2v 
  
  
  
  -c:v libx264 
  
  -preset medium -crf 18 
  
  -pix_fmt yuv420p 
  
  
  
  -s 720x540 
  
  -aspect 4:3 
  
  
  
  -vf "fps=24000/1001" 
  
  
  
  output.mp4

• downloaded a streaming video file from a website with ffmpeg in 1080p but i wanted to download in 720p as i have disk space limitations [on hold]

  22 octobre 2018, par C.J.

  I apologize if my language was unclear let me try to rephrase the question. I have downloaded a video from a video streaming website called "hotstar.com" with the help of ffmpeg. I extracted the m3u8 link from the site and was able to download it. The video is in 1080p video resolution which takes a lot of space. I want to download it in 720p resolution so that it would take less space. the code that i tried for it was this

  ffmpeg -i "https://hsprepack.akamaized.net/videos/hotstarint/world/kwks6/1_2/master.m3u8?hdnea=st=1540184067~exp=1540185867~acl=/*~hmac=a8945f016b594e1e2e4192ee05e2feaa5811c687d1891f69be1acc9057dd725f"
  
  -c copy output.mp4

  I hope I have asked properly this time. If not do tell me what is more needed.

• How to decode G.729b codec ?

  6 décembre 2018, par Sameer Thapa

  I am developing an application that listens for RTP data using GStreamer and converts the received raw data packets using FFMPEG.
  I works well for codes : PCMA, PCMU, G722 and G729 and converts the received audio files into wav and mp3. But the conversion fails when G729b packet is received. FFMPEG has support for G729 as mentioned here but nothing is mentioned about G729a/b. GStreamer also has not mentioned anything about G729a/b though has a decoder for G729. I also didn’t find any other library that can convert G729b to wav or mp3.
  Can anyone please suggest any way or any library to convert G729a/b to wav.
  Thanks in advance !

  Command used :
  ffmpeg -f g729 -i .g729 -acodec pcm_s16le -ar 8000 output.wav

  Please find the two files here