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• ffmpeg convert from WMV to AVC1 instead of "official" H264 [on hold]

  26 mars 2014, par thipeto

  I searched google for an answer, but I can't find the solution. It's for professional use.

  I'm trying to convert some wmv files (WMV3) to MP4 (H.264). It should take the format h.264, and instead of it, it's taken the H.264 (AVC1) format.

  It seems like the AVC is a format used in Apple, and I don't want to convert to this format, only to h264 "official", the one who fourcc shows me.
  I'm using the last version of ffmpeg, following is the basic command that I'm using :

  ffmpeg -i input.wmv -c:v libx264 -q:v 0 output.mp4

  I'm trying to understand the reason that some PCs here convert to h264, and other to AVC1.
  Someone can help me ? What should I do to make the other PCs convert to the real h.264 without install a pack of codecs ? I just want to convert to mp4, there's a way to install only codecs to convert to mp4 ?

  Many thanks,
  Thiago.

• Generating 64kbps audio-only mpegts for HTTP Live segmenter to meet 64kbps audio only requirement

  14 juin 2013, par Pobre

  I am trying to convert our mp4 files into mpeg-ts and segment it into .ts files for my iphone app to play. I am using Carson McDonalds's HTTP-Live-Video-Stream-Segmenter-and-Distributor to do that.

  I got his stuff complied and working correctly. I am currently trying to meet Apple's requirement where I need to provide a baseline 64 kbps audio only stream to my m3u8 playlist.
  Carson doesn't seem to have a profile for that.

  I need to be able to generate 64kbps audio-only stream from mp4, and turn that into mpeg-ts for the segmenter into ts. I am trying to find the right ffmpeg command that will validate without problem using Apple's mediastreamvalidator.

  So far I modified an existing encoding profile to try to achieve 64kbps total :

  ffmpeg -er 4 -i %s -f mpegts -acodec libmp3lame -ar 22050 -ab 32k -s 240x180 -vcodec libx264 -b 16k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 64k -maxrate 16k -bufsize 16k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 4:3 -r 10 -g 30 -async 2 - | %s %s %s %s %s

  but then when I try to validate it using mediastreamvalidator, it gives error after few ts :

  Playlist Validation : OK

  Segments :

  sample_cell_4x3_64k-00001.ts :

  WARNING : Media segment exceeds target duration of 10.00 seconds by 1.30 seconds (segment duration is 11.30 seconds)

  sample_cell_4x3_64k-00002.ts :

  WARNING : Media segment exceeds target duration of 10.00 seconds by 1.40 seconds (segment duration is 11.40 seconds)

  ....
  ....

  sample_cell_4x3_64k-00006.ts :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  sample_cell_4x3_64k-00007.ts :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  ....
  ....
  Average segment duration : 10.26 seconds
  Average segment bitrate : 376797.92 bps
  Average segment structural overhead : 349242.17 bps (92.69 %)

  Is there someway I can generate this correctly with just audio which totals 64kbps and turn it into mpeg-ts ready to be segmented and validated correctly ?

  Am I approaching the problem right ?

• Creating an HLS audio playlist from multiple .mp3 files

  28 janvier, par tamirg

  I have a list of .mp3 audio files, and i would simply like to create an HLS playlist from those files.

  


  I tried to manually create a m3u8 playlist file. for example :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:10.0,
audio_1.mp3
#EXTINF:10.0,
audio_2.mp3
#EXTINF:10.0,
audio_3.mp3
#EXTINF:10.0,
audio_4.mp3
#EXTINF:10.0,
audio_5.mp3


  


  But when doing so, if i simply play that playlist with ffmpeg, the first file being played is audio 4 for some reason, and there also a millisecond of silence when it passes between chunks.

  


  Are those mp3 files must be converted to .ts ?

  


  edit : apple music plays that just fine, can the issue be with ffmpeg misreading the h3u8 file ?