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• ffmpeg Live Input MP4 Error [migrated]

  3 mars 2013, par Brianjs

  Currently I have a mic and a webcam connected to my computer. I am running ffmpeg on CentOS 6.3.

  When I try to record a video without audio by :

  ffmpeg -y -f video4linux2 -t 15 -s 640x480 -r 25 -i /dev/video0 /home/irdb/Desktop/out2.mp4

  it runs perfectly and I get a nice video. However when I try to run with audio included by :

  ffmpeg -y -f video4linux2 -t 15 -s 640x480 -r 25 -i /dev/video0 -f alsa -ar 22050 -ab 64k -ac 2 -i default /home/irdb/Desktop/out2.mp4

  It errors out and prints :

  [NULL @ 0x1e33fc0] Codec is experimental but experimental codecs are not enabled,      see -strict -2
  
  Output #0, mp4, to '/home/irdb/Desktop/out2.mp4':
  
  Stream #0:0: Video: h264, yuv420p, 640x480, q=-1--1, 90k tbn, 25 tbc
  
  Stream #0:1: Audio: none, 22050 Hz, 2 channels, flt, 128 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Stream #1:0 -> #0:1 (pcm_s16le -> aac)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such    as bit_rate, rate, width or height

  I assume this has to do with the first error as when I use something like mpg it works just fine. However I plan on streaming this live and want mp4 format as that is pretty much supported by all browsers (Firefox with flash fallback).

  Does anyone know how to get the audio to work without additional processing (as I want to stream live and not write to a file eventually).

• FFMPEG mp4 from http live streaming m3u8 file ? [closed]

  23 octobre 2024, par thiago.adriano26

  How Can I extract mp4 from http live streaming m3u8 file ? I Tried this command below :

  



  ffmpeg -i {input file} -f rawvideo -bsf h264_mp4toannexb -vcodec copy out.mp4


  



  I took this error :

  



  


  [NULL @ 0000000002f07060] Packet header is not contained in global extradata, corrupted stream or invalid MP4/AVCC bitstream Failed to open bitstream filter h264_mp4toannexb for stream 0 with codec copy : I

  


  


• Saving video to SD card while live streaming to YouTube using FFmpeg

  15 mai 2020, par Zohair Ul Hasan

  I'm trying to set up a Raspberry Pi so that it live streams video to YouTube using the Raspberry Pi camera and also saves the video to the SD Card for backup, in case the internet gets disconnected. I used Alex Ellis's guide to set it up, which is basically a docker image that anyone can download and set it up. He sets up the live stream to YouTube but doesn't save the video offline.

  



  So, I tinkered with his code and found that he used FFmpeg to stream to YouTube. The following line is basically the heart of his method to stream :

  



  raspivid -o - -t 0 -w 1920 -h 1080 -fps 40 -b 8000000 -g 40 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i pipe:0 -c:v copy -c:a aac -ab 128k -g 40 -strict experimental -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/$1


  



  I read up about FFmpeg and apparently, to save this stream to my SD card all I need to do is add the directory where I want to save my video to the end of this code. I modified it like so at the end of the line :

  



  raspivid -o - -t 0 -w 1920 -h 1080 -fps 40 -b 8000000 -g 40 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i pipe:0 -c:v copy -c:a aac -ab 128k -g 40 -strict experimental -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/$1 /home/pi/Desktop/my_video.mp4


  



  However, when I ran this, the terminal threw this error :

  



  /home/pi/Desktop/my_video.mp4: No such file or directory


  



  This path, however, definitely exists by default in all Raspberry Pi's. I'm not sure what's wrong here, can someone please help me out ?

  



  P.S : as an additional side question, I read up the documentation on FFmpeg and it specifically says not to use the -re argument when using a live input source, but Alex uses it anyways. Should I substitute it with something different ? It works fine right now though.