Recherche avancée

Sur d’autres sites (9341)

• ffmpeg : fix transcoding dvbsub to dvbsub

  22 juin 2014, par Anshul Maheshwari

  ffmpeg : fix transcoding dvbsub to dvbsub
  fix ticket #2024
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] ffmpeg.c

• FFMPEG RTX 8000 out of memory

  23 juin 2020, par Mahdi Adnan

  I have an RTX 8000 and I'm using FFMPEG to transcode multiple streams concurrently.
Each stream consume around 575MiB, and when the memory usage reaches around 28000MiB, FFMPEG throw the following message when starting a new transcode session :

  



  [h264_nvenc @ 0x55cd1d574800] dl_fn->cuda_dl->cuCtxCreate(&ctx->cu_context_internal, 0, cu_device) failed -> CUDA_ERROR_OUT_OF_MEMORY : out of memory
[h264_nvenc @ 0x55cd1d574800] No NVENC capable devices found
Error initializing output stream 2:0 — Error while opening encoder for output stream #2:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  



  The machine is running Ubuntu 20.04
FFMPEG is a snap package from Ubuntu repo "version 4.2.2-1ubuntu1"
nVidia driver nvidia-driver-435 installed from Ubuntu repo

  



  command used for the transcode :
ffmpeg -i SRC -c:v h264_cuvid -vcodec h264_nvenc -preset:v medium -profile:v main -vf "scale=1920 :-2" -hls_flags delete_segments -hls_init_time 4 -hls_time 4 -maxrate 6000k -g 100 -bufsize 12000k -b:v 3000k -start_number 1 -async 1 -c:a aac -b:a 128k 1080.m3u8

  



  Is the RTX 8000 have any limitation on the Memory usage ? are the parameters I'm using causing this issue ?

  



  Thanks

  


• Transcoding with custom commands using streamio-ffmpeg

  14 avril 2017, par ACIDSTEALTH

  I’m trying to transcode a video file using streamio-ffmpeg with some custom commands, but nothing I try seems to work. I want to transcode the video with the following options :

  ffmpeg -i input.mp4 -vf
  
      "format=yuv444p,
  
       drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max,
  
       drawtext=font='OpenSans-Regular,Sans':text='CUSTOM TEXT':fontcolor=0xFFFFFF:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th,
  
       format=yuv420p"
  
  -c:v libx264 -c:a copy -movflags +faststart output.mp4

  I’ve tried the following code combinations without success :

  1. Tried removing the line breaks and converting the command string to an array, following the instructions in the docs.

     video = FFMPEG::Movie.new('input.mp4')
     
     opts = %w(ffmpeg -i input.mp4 -vf "format=yuv444p, drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max, drawtext=font='OpenSans-Regular,Sans':text='CUSTOM TEXT':fontcolor=0xFFFFFF:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th, format=yuv420p" -c:v libx264 -c:a copy -movflags +faststart output.mp4)
     
     video.transcode('output.mp4', opts)

     But this yields the error :

     [NULL @ 0x7f962100e200] Unable to find a suitable output format for 'ffmpeg'
     
     ffmpeg: Invalid argument
     
     from /Users/ACIDSTEALTH/.gem/ruby/2.3.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:112:in `validate_output_file'

  2. Tried stripping out the input file name and output file name since the gem seems to handle that for you.

     video = FFMPEG::Movie.new('input.mp4')
     
     opts = %w(-vf "format=yuv444p, drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max, drawtext=font='OpenSans-Regular,Sans':text='CUSTOM TEXT':fontcolor=0xFFFFFF:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th, format=yuv420p")
     
     video.transcode('output.mp4', opts)

     Which returns this error :

     [NULL @ 0x7fd0a9008c00] Unable to find a suitable output format for 'drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max,'
     
     drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max,: Invalid argument
     
     from /Users/ACIDSTEALTH/.gem/ruby/2.3.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:112:in `validate_output_file'

  3. Tried removing the -vf flag and just running everything within the quotation marks.

     video = FFMPEG::Movie.new('input.mp4')
     
     opts = %w(format=yuv444p, drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max, drawtext=font='OpenSans-Regular,Sans':text='CUSTOM TEXT':fontcolor=0xFFFFFF:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th, format=yuv420p)
     
     video.transcode('output.mp4', opts)

     This returns another error :

     [NULL @ 0x7fab8101fe00] Unable to find a suitable output format for 'format=yuv444p,'
     
     format=yuv444p,: Invalid argument
     
     from /Users/ACIDSTEALTH/.gem/ruby/2.3.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:112:in `validate_output_file'

  4. Tried removing the format arguments since ffmpeg is clearly complaining about those.

     video = FFMPEG::Movie.new('input.mp4')
     
     opts = %w("drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max, drawtext=font='OpenSans-Regular,Sans':text='CUSTOM TEXT':fontcolor=0xFFFFFF:fontsize=24:x=(w-tw)/2:y=(h/PHI)+th")
     
     video.transcode('output.mp4', opts)

     Again another error :

     [NULL @ 0x7fc7f880a800] Unable to find a suitable output format for 'drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max,'
     
     drawbox=y=ih/PHI:color=0x000000@0.4:width=iw:height=48:t=max,: Invalid argument
     
     from /Users/ACIDSTEALTH/.gem/ruby/2.3.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:112:in `validate_output_file'

  5. Tried building a hash from the command string and feeding that into the transcode method.

     video = FFMPEG::Movie.new('input.mp4')
     
     opts = {
     
         '-vf' => {
     
             format: 'yuv444p',
     
             drawbox: {
     
                 y: 'ih/PHI', color: '0x000000@0.4', width: 'iw', height: '48', t: 'max'
     
             },
     
             drawtext: {
     
                 font: 'OpenSans-Regular,Sans', text: snap.title, fontcolor: '0xFFFFFF', fontsize: '24', x: '(w-tw)/2', y: '(h/PHI)+th'
     
             },
     
             format: 'yuv420p'
     
         }
     
     }
     
     video.transcode('output.mp4', opts)

     I also tried a variation without the -vf flag :

     video = FFMPEG::Movie.new('input.mp4')
     
     opts = {
     
         format: 'yuv444p',
     
         drawbox: {
     
             y: 'ih/PHI', color: '0x000000@0.4', width: 'iw', height: '48', t: 'max'
     
         },
     
         drawtext: {
     
             font: 'OpenSans-Regular,Sans', text: snap.title, fontcolor: '0xFFFFFF', fontsize: '24', x: '(w-tw)/2', y: '(h/PHI)+th'
     
         },
     
         format: 'yuv420p'
     
     }
     
     video.transcode('output.mp4', opts)

  These both produced an output.mp4 video file but the output file was unchanged from the input. There was no text overlay.

  Nothing I try seems to work. What am I doing wrong here ?