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• Merge mp3 files having different bitrate using ffmpeg [closed]

  9 janvier 2013, par XCoder

  ffmpeg -i "concat:file1.mp3|file2.mp3" -acodec copy output.mp3

  This command works fine if file1.mp3 & file2.mp3 have same bit-rates.

  I've been searching for past 4 hours but found nothing on how to merge mp3 files having different bit-rates.

  I have two different mp3's having bitrates of 128Kbps & 192Kbps. How to merge them to form a single mp3 file.

• ffmpeg conversion command to output to h.264 for iPad

  23 juin 2016, par janet-PCF

  I’m looking for a good (general) conversion command that will convert any input file to h.264 sized for the iPad.

  Currently I have this command that works, that was adapted from robert.swain

  With presets :

  $ ffmpeg -i INPUT -acodec aac -ab 160000 -s 1024x768 -vcodec libx264 \
  
           -vpre slow -vpre ipod640 -b 1200kb -threads 0 -f mp4 OUTPUT.mp4

  Long form, no presets :

  $ ffmpeg -i INPUT -acodec aac -ab 160000 -s 1024x768 -vcodec libx264 \
  
           -coder 1 -flags +loop -cmp +chroma \
  
           -partitions +parti8x8+parti4x4+partp8x8+partb8x8 -me_method umh \
  
           -subq 8 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 \
  
           -i_qfactor 0.71 -b_strategy 2 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 \
  
           -bf 3 -refs 5 -directpred 3 -trellis 1 \
  
           -flags2 +bpyramid+mixed_refs+wpred+dct8x8+fastpskip -wpredp 2 \
  
           -rc_lookahead 50 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 \
  
           -level 30 -maxrate 10000000 -bufsize 10000000 -wpredp 0 -b 1200k \
  
           -threads 0 -f mp4 OUTPUT.mp4

  Note : I’m skipping the aspect ratio because we handle that in the program, and we only resize it if the input resolution is greater than the output resolution.

  If there’s any suggestions for improvement, we are looking to balance speed, quality and conversion time.

• MP3 Audio requiring overlays at specific intervals to ensure I dont break copyright rules

  15 novembre 2012, par user1828008

  I have started a project as a DJ to record my online radio shows to mp3. The station I play on is licenced so I am not breaking any copyright rules there. I have had the idea to upload the recordings onto Youtube.

  Clearly that needed some form of adjustment to make a video over the top of the audio which I have achieved using ffmpeg so I have an mp4 file with a picture overlay for the duration of the audio. I did a quick test run to upload the video to Youtube and it tracked that I was playing copyrighted material. It was exactly right in its statement and yes as my own channel on youtube I am not licenced to do so. Either way I have spoke to the copyright owners and they have agreed it is fine.

  However in order to not have to do this every week if I overlay a 5 second 'jingle' every 4 minutes over the audio (fading down if possible) the main volume slightly to play the jingle and fade up after (once again if possible) then I am 100% in the clear. I could do this manually but would rather something I can script in bash to do it for me.

  I am using Centos 6.3 operating system and FFMPEG solved the merge of video and audio together, but I couldnt find anything to do a predefined audio overlay at specific intervals.

  I have looked at programs like Avisynth and Sox but dont believe from the documentation that they have anything that can do regular interval overlays during a single track. The closest thing I could find is on this post :

  Add multiple audio files to video at specific points using FFMPEG

  But it would be nice to do everything in a single sweep with ffmpeg of the audio file (video and audio overlay) if thats possible somehow or any better options that are out there ?

  If you need any more info from me then please let me know.
  Thanks