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• HLS and ffmpeg - losing audio ?

  12 octobre 2015, par Stefan Kendall

  With the following command, I only get video. The same setup with -f segment gets video and audio, but then the resulting stream doesn’t play on an iPhone.

  How do I get ffmpeg to encode video and audio into the HLS segments ?

  ffmpeg -v 9 -loglevel error -re -i rtmp://localhost/live/test \
  
  -c:v libx264 -c:a copy \
  
  -flags -global_header -map 0 -f hls \
  
  -hls_list_size 10 \
  
  -hls_flags delete_segments /usr/local/nginx-streaming/html/video/stream.m3u8 

• AudioQueue bytes to ffmpeg understandable WAV format

  24 décembre 2015, par moeseth

  I got the recorded AudioQueueBufferRef buffer using the following code.

  NSData *data = [NSData dataWithBytes:inBuffer->mAudioData length:inBuffer->mAudioDataByteSize];

  And then, I send the data to my server. However, FFMPEG isn’t able to read that because the data is not in any audio standard format.

  It’s just plain data.

  So, how do I do either on iPhone or backend ffmpeg to convert that raw buffer to WAV ?

  Thank so much.

• Timelapse (1/6 fps) from slo-mo (240 fps) with ffmpeg

  4 avril 2022, par baskak

  I recorded slo-mo video on an iPhone SE (2) by mistake instead of timelapse.

  


  I know there's a lot of answers to this question here, but I'm trying again and again and always something's wrong (like a video that has a correct total no. of frames, but lasts 3 hours and is basically a freeze :D )
My recent command was

  


  


  ffmpeg -i IMG_2174.MOV -vf framestep=1440,setpts=N/120/TB -c:v libx264
-preset slow -crf 22 -an -r 30 IMG_2174.timelapse.MOV

  


  


  but it resulted in a one-second-long video, so way over-timelapsed. Should be several seconds IINM. The source video is 30 minutes long @240fps, 17GB.
Thx.