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• Fully GPU accelerated (decoding,deinterlacing,scaling,encoding) HLS variable stream with ffmpeg

  6 juillet 2021, par Milan Čížek

  I'm trying to create a variable HLS MBR live stream using ffmpeg, which will be fully accelerated at the GPU level. This means accelerated decoding, deinterlacing, scaling and encoding. Here is my broken example ...

  


  ffmpeg -loglevel debug -hwaccel cuvid -c:v h264_cuvid -hwaccel_output_format cuda -vsync 0 -i "udp://@239.250.4.152:1234?fifo_size=1000000&overrun_nonfatal=1" \
-filter_complex "[0:v]yadif_cuda=0:-1:0,split=3[v1][v2][v3],[v1]copy[v1out],[v2]scale_npp=1280:720[v2out],[v3]scale_npp=720:405[v3out]" \
-map [v1out] -c:v:0 hevc_nvenc -b:v:0 4000k -g 48 \
-map [v2out] -c:v:1 hevc_nvenc -b:v:0 3000k -g 48 \
-map [v3out] -c:v:2 hevc_nvenc -b:v:0 2000k -g 48 \
-map a:0 -c:a:0 aac -b:a:0 128k -ac 2 \
-map a:0 -c:a:1 aac -b:a:1 96k -ac 2 \
-map a:0 -c:a:2 aac -b:a:2 64k -ac 2 \
-f hls \
-hls_playlist_type event \
-hls_segment_type mpegts \
-hls_time $seglen \
-hls_list_size $numsegs \
-hls_flags delete_segments+independent_segments \
-hls_segment_filename "$dst/stream_%v/$segments" \
-hls_base_url "$url" \
-master_pl_name "$dst/$index" \
-var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \
"$dst/$index"


  


  Note : My graphics card can handle more than 2 concurrent encodings.
I'm getting a classic error "Impossible to convert between the formats supported by the filter 'Parsed_split_1' and the filter 'auto_scaler_0'".

  


  Is my goal real ? Or what is the proper way to use the GPU in this scenario as efficiently as possible ? Thanks for the help.

  


  Stream mapping:
   Stream # 0: 3 (h264_cuvid) -> yadif_cuda (graph 0)
   copy (graph 0) -> Stream # 0: 0 (h264_nvenc)
   scale_npp (graph 0) -> Stream # 0: 1 (h264_nvenc)
   scale_npp (graph 0) -> Stream # 0: 2 (h264_nvenc)
   Stream # 0: 4 -> # 0: 3 (ac3 (native) -> aac (native))
   Stream # 0: 4 -> # 0: 4 (ac3 (native) -> aac (native))
   Stream # 0: 4 -> # 0: 5 (ac3 (native) -> aac (native))


  


• path issues with FFMPEG Bash script to concat and encode across multiple subfolders

  27 décembre 2022, par NoobCoder

  I'm trying to write a bash script for Mac OSx Terminal to compress a series of GoPro .MP4 videos from the SDcard directly into a smaller .MP4s on a local network server. The GoPro saves .MP4s in the 100GOPRO folder on the card. After filming, I will through that folder and manually put .MP4s from each game into subfolders within the 100GOPRO folder, named A1, A2, A3, etc.

  


  Folder structure

  


  /GoPro/DCIM/100GOPRO/
               -------/A1/
                       -----GX01xxx1.mp4
                       -----GX01xxx2.mp4
               -------/A2/
                       -----GX01xxx3.mp4
                       -----GX01xxx4.mp4
                       -----GX01xxx5.mp4
                       -----GX01xxx6.mp4


  


  ...etc

  


  I would like then like to run a script from the 100GOPRO folder that will do these steps :

  


  

  1. Within each subfolder, auto-create a file.txt with the names of the subfolder's .MP4s in the format to concat the files (each line has "file 'GX01xxx3.mp4'")

  


  2. Pass that subfolder's file.txt as the input to ffmpeg to reencode and save to a network folder with the name A1.mp4 or A2.mp4

  


  3. Repeat for each subfolder and quit.

  


  


  I'm getting hung up on the dynamic path to the subfolder's file.txt. My code just creates a file.txt in the 100GOPRO folder, and appends all the subfolder contents into that single long combined text file. The output then would create a correct first MP4, but second MP4 contains folder 1 and 2, then 3 contains 1, 2, and 3, etc.

  


  Here's the script I ran :

  


  #!/bin/bash
for f in A*/*.mp4 ; do
echo file \'$f\' >> list.txt ;
done && ffmpeg -f concat -safe 0 -i list.txt /Volume/Server/Videos/A$f.mp4 && rm list.txt


  


  Clearly, failing in how that path for echo to save in the subfolder A*, how to call that subfolder's file.txt as the input for ffmpeg, and how to name the output after the folder.

  


  Thanks for any help you can offer.

  


• Avconv : Select german stream not highest quality one

  15 novembre 2013, par mblaettermann

  I am converting some input stream from my DVB S2 Card to RTMP.

  Everything works fine after switching to recent avconv and x264 :)

  The only thing I couldn't find out is, how do I select the right audio stream ?

  The source sometimes has up to 6 audio tracks. Avconv automatically chooses the one with the highest bitrate. However I want to select the "ger" one :

  Here are the streams of ARTE german/french TV Channel for example :

  Input #0, mpegts, from 'http://192.168.1.50:9981/stream/channelid/1035':
  
    Duration: N/A, start: 19083.694722, bitrate: 15576 kb/s
  
    Program 1
  
      Stream #0.0[0xa8], 127, 1/90000: Video: mpeg2video (Main), yuv420p, 544x576 [PAR 32:17 DAR 16:9], 1/50, 15000 kb/s, 25 fps, 90k tb50 tbc
  
      Stream #0.1[0x70](fre), 204, 1/90000: Audio: mp2, 48000 Hz, stereo, s16p, 192 kb/s
  
      Stream #0.2[0x71](ger), 207, 1/90000: Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s
  
      Stream #0.3[0x72](eng), 207, 1/90000: Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s
  
      Stream #0.4[0x73](qaa), 207, 1/90000: Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s
  
    No Program
  
      Stream #0.5[0x3b], 126, 1/90000: Audio: mp1, 0 channels, s16p

  libav Docs are really not that helpful. Who does now the right syntax ?

  EDIT : I found the -map option : http://ffmpeg.org/trac/ffmpeg/wiki/How%20to%20use%20-map%20option But it is not possible to map by name ? Only by index ?

  Maybe I need to use avprobe then, to find the corrent stream index for "ger".