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• Problems using Cuda for video transcoding [closed]

  19 août 2022, par Jay Adlard

  I just bought a new pc as my faithful old windows 7 i7 laptop died. Now the laptop had both intel and nvidea gtx660m chips. When I transcoded video with handbrake the intel graphics managed 8fps when I changed over to the nvidia it managed 80fps and the graphics card got nice and hot so was obviously working.

  


  The new machine i bought is a i9 with an nvidea gtx780 running windows 10. When I tried to transcode some video hoping for it to use the cpu and Gpu but no joy,the card stays cool power usage is only a handful of watts higher than it running something simple.I had been using handbrake but I read it doesn’t support Cuda so why the laptop speeded up I don’t know. A friend of mine that is into ffmpeg came round found that ffmpeg reports no Cuda yet the card works fine in every other respect. Unlike the rest of the machine the graphics card wasn’t new but it looked like new…

  


  One thing to note I am not talking about nvenc as the quality is rather poor, no point in capturing uncompressed files cleaning them up and not using an encoder that will do 2 pass and an exhaustive search.
Can anyone recommend a reasonably priced encoder that will use the Cuda cores ?

  


  Has anyone got any idea what the problem is ?

  


• Demo of WebM Running on TI OMAP 4 Processor

  15 octobre 2010, par noreply@blogger.com (John Luther)

  Texas Instruments has made a video of HD-resolution (1080p) VP8 (WebM) video playing on their new TI OMAP™ 4 processor, in both Android and Ubuntu.

  (If you have a WebM-enabled browser and are enrolled in the YouTube HTML5 beta the video will play in WebM HTML5, otherwise it will play in Flash Player.)

  For more info about the OMAP 4 and the IVA 3 video accelerator that enables low-power HD playback of VP8 on the chip, see the TI web site.

  

• FFMPEG cropping size is always wrong

  19 avril 2020, par Samsy

  I need a bunch of video to be EXACTLY 1024x512 ( power of 2 video ), not a pixel less, not a pixel more..

  



  I'm scaling them first to 1024 width

  



  Then cropping them to 1024x512

  



  Problem is..

  



  result always ends up with 1 pixel more or 2 less pixels in width etc...

  



  Source dimension : 1624 × 1080
Output dimension : 1022 × 512


  



  Source dimension : 1264 × 720
Output dimension : 1025 × 512


  



  rm -R ./output

mkdir output

cd input

for i in *.mp4;

  do name=`echo "$i" | cut -d'.' -f1`

  FILE="${name}"

  TMP="temp.mp4"

  INPUT="${FILE}.mp4"

  OUT_PUT="../output/${FILE}.mp4"

  JPEG_OUTPUT="../output/${FILE}.jpg"

  echo FILE

  echo INPUT

  ffmpeg -i $INPUT -filter:v scale=1024:-2 -c:a copy ${TMP}

  ffmpeg -i ${TMP} -filter:v "crop=1024:512:exact=1" -c:a copy ${OUT_PUT}

  # ffmpeg -loglevel panic -i $OUT_PUT -vframes 1 -f image2 $JPEG_OUTPUT

  rm ${TMP}

done