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• ffmpeg options that work with Chrome

  21 avril 2015, par James

  I am trying to find the magic options that make mp4 work in Chrome. I think my videos were working, but don’t seem to any more after Chrome updated.

  Chrome, Version 41.0.2272.101 (Windows)

  I tried some other machines and found some of the videos worked on older versions, and my Mac seems to still work on the latest Chrome.

  I am using the ffmpeg options to convert from png series,

  ffmpeg -framerate 10 -i dance%02d.png  -r 10 -pix_fmt yuv420p dance.mp4

  Some videos work, some don’t, some work some of the time, or stop half way through.

  I tried various other options like,

  ffmpeg -start_number 16 -framerate 10 -i dance%02d.png -r 10 -an -s hd720 \
  
  -vcodec libx264 -pix_fmt yuv420p -preset slow -profile:v baseline \
  
  -movflags faststart -y dance.mp4

  but this just seemed to make things worse.

  here is one of the videos,
  http://www.botlibre.com/media/a786625.mp4

  and another one,
  http://www.botlibre.com/media/a812450.mp4

  Firefox seems to work no problem, on any version, grey background though.
  IE works fine, white background.
  Safari works, grey background.

  Another thing, they videos used to have white background on older Chrome version, but now are grey, except on Mac still white.

  and one more thing. Webm format works, but anyone know the option to remove transparency ? I’m using,

  ffmpeg -i dance%02d.png  -r 10 -c:v libvpx -crf 10 -b:v 512k -c:a libvorbis dance.webm

  just want a solid white background.

• ffmpeg and hardcoding subtitles

  8 avril 2015, par Adin Gill

  I have a command like so

  ffmpeg -i "F:\Filebotted\Rail Wars\Season 1\Rail Wars.S01E07(7).You Look Good in That. 1080p.mkv" -map 0:0 -map 0:1 -b:v 750k -b:a 128k -c:v libx264 -c:a mp3 -ac 2 -filter_complex "subtitles=F:\Filebotted\Rail Wars\Season 1\Rail Wars.S01E07(7).You Look Good in That. 1080p.mkv,scale=-1:360" "C:\Users\Adin\Desktop\Testy mc test\Rail Wars.S01E07(7).You Look Good in That. 1080p.mkv"

  Yes it is long but unfortunatly ffmpeg chucks a hissy fit and spits out the following

  [subtitles @ 00000000050ce7c0] Unable to parse option value "FilebottedRail Wars
  
  Season 1Rail Wars.S01E07(7).You Look Good in That. 1080p.mkv" as image size
  
      Last message repeated 1 times
  
  [subtitles @ 00000000050ce7c0] Error setting option original_size to value Fileb
  
  ottedRail WarsSeason 1Rail Wars.S01E07(7).You Look Good in That. 1080p.mkv.
  
  [Parsed_subtitles_0 @ 0000000002c714c0] Error applying options to the filter.
  
  [AVFilterGraph @ 0000000002c5c540] Error initializing filter 'subtitles' with ar
  
  gs 'F:FilebottedRail WarsSeason 1Rail Wars.S01E07(7).You Look Good in That. 1080
  
  p.mkv'
  
  Error configuring filters.

  It works just fine when the file is in the same folder as ffmpeg (I found out that it doesn’t like ’ or - in the filename, but I just spent an hour trying to work out the issue with no avail.

  Any help will be appreciated :)

• FFMpeg is writing a matplotlib animation with diminishing quality

  3 mars 2017, par Bryan Stafford

  I am trying to create a bunch of animations that follow the paths National Hockey League teams travel during the current season. Currently, my animation looks like this.

  As you can see, the animation begins decently sharp but within 2 seconds the quality bottoms out and everything is grainy.

  The relevant code is this :

  ani = animation.FuncAnimation(fig, update, frames=len(all_x + 20), 
  
                                interval=75, repeat=False)
  
  filepath =  map_team + '.mp4'
  
  ani.save(filepath, writer='ffmpeg', fps=30)
  
  plt.tight_layout()
  
  plt.show()

  I have chosen FFMpeg as my writer because I hope to put about 30 graphics online and the MP4 format keeps each file around 1.5MB. If there’s a way to keep the graphics sharp, with low file sizes, and able to be uploaded onto Imgur, I would love to do that with my project.

  Thanks.