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• ffmpeg - Ubuntu - Covert mkv to mp4 and hard sub

  27 août 2018, par Ben Owen

  basicly i have 500+ mkv files that i need converting to mp4 they all have ASS subs in side the mkv files, but the video player that i need the mp4 to play have no soft sub option so i need the subs hardsubbed to the mp4 file

  i have tired so many diffrent options

  the closest ive got is this

  for f in *.mkv; do ffmpeg -i "$f" -vf subtitles=${f%.mkv} -acodec copy anime2/"${f%.mkv}.mp4"; done

  error i get is this

   Unable to find a suitable output format for 'Bleach'
  
  Bleach: Invalid argument

  bleach is part of the file name but the full file name is [horriblesubs] bleach - ep number [720].mkv

  I would prefer a batch or loop option as doing one by one will take to long

• Why does hard-coding subtitles into MKV cause resulting video length to be wildly incorrect ?

  21 mai 2018, par BudJB

  I am trying to encode an existing MKV with a video, audio, and several subtitle streams, such that video encodes with H264, audio encodes with AAC, and the second subtitle track is hard-coded into the video stream. I am using the myffmpeg GUI frontend, but can view and modify the ffmpeg command before it’s run.

  Every time that I run the encode, the MKV reports that the duration is 1195 hours and change, where it’s supposed to be around 2 hours, plus some change. If I encode without the hard-coded subtitles, things turn out alright.

  Here’s the command that’s run, with the latest ffmpeg :

  ffmpeg.exe -probesize 50M -analyzeduration 100M -i "D:\Video\in.mkv" -c:a aac -ac 6 -strict -2 -async 1 -c:v libx264 -crf 20 -r 24000/1001 -s 1920x1080 -aspect 16:9 -pix_fmt yuv420p -preset fast -partitions default  -b-pyramid 1 -weightb 1 -8x8dct 1 -fast-pskip 0 -direct-pred 1 -coder ac -trellis 1 -me_method hex -subq 6 -me_range 16 -bf 3 -b_strategy 1 -refs 3 -flags +loop -sws_flags fast_bilinear -sc_threshold 40 -keyint_min 24 -g 48 -qmin 3 -qmax 51 -qdiff 4 -filter_complex "[0:v][0:s:2]overlay[out]" -map [out]  -map 0:a:0 -sn -y "D:\Video\out.mkv"

  I’ve tried a couple other MKV’s with the same results. Anyone else run into this or know what’s going on ?

• Failed to hard-ware accelerate video decoding via Tesla P40

  20 mai 2018, par Potemkin

  While I am writing a surveillance video recognition demo, I find it is much slower to simply play a video in the server(Xeon E5-2680 2.4GHz, Tesla P40) than in my laptop(i7-8550 1.8GHz, Intel UHD Graphics 620).

  I use DXVA-Checker to see the video decoder device, and notice that my laptop use the GPU for decoding, but the server use no GPU for the job. Then I check ’nvidia-smi’, and it shows all of GPUs are running in TCC driver model, not WDDM driver model. And I cannot turn it to WDDM because nvidia-smi says it is not supported.

  The video play demo is written via OPENCV, in which the video decoding part is from ffmpeg. The server runs in Windows-server-2012, and my laptop is on Windows 10.

  The question is how can I get the server decoding videos with GPUs, and is this the reason for the slowness or there is something else ?