Recherche avancée

Sur d’autres sites (7431)

• How to reduce jitter in gstreamer udp multicast. I can't make it less than 140ms. And who makes it so big. Demultiplexer or multiplexer. ffmpeg work

  4 septembre 2023, par Slava

  I need to feed a udp multicast stream to gstreamer. Make the conversion to audio without touching the video and output it again to udp multicast. The design is simple and it works. But the output is a very large 140ms jitter. How can I reduce the jitter. Here is the construction I use

  


  gst-launch-1.0 udpsrc uri="udp://224.0.191.147:1234" ! tsdemux name=tsdemux0 tsdemux0.video_0_03f3 ! queue ! h264parse ! mpegtsmux name=tsmux0 ! queue ! udpsink host=230.3.2.2 port=1234 auto-multicast=true ttl-mc=64 tsdemux0.audio_0_03f4 ! queue ! decodebin ! audioconvert ! audiokaraoke ! avenc_mp2 ! tsmux0.


  


  I tried to use various parameters but couldn't get a good result. Please help. I've been solving this problem for a week now

  


  This design works well. But I need it on gstreamer

  


  ./ffmpeg -threads auto -thread_type 1 -re -i "udp://224.0.191.147:1234?fifo_size=50000000&overrun_nonfatal=1" -filter_complex "aderivative" -max_delay 3000000 -max_muxing_queue_size 1000000 -muxrate 5000000 -c:v copy -f mpegts -muxrate 5M -pcr_period 20 -pat_period 0.10 -sdt_period 0.25 -metadata service_provider="My Provider" -metadata service_name="MyTV Channel" -metadata title="MyTV Channel" -metadata:s:a:0 language=rus -mpegts_flags +pat_pmt_at_frames -flags cgop+ilme -sc_threshold 1000000000  "udp://230.3.2.2:1234?pkt_size=1316&ttl=64&&bitrate=5000000&overrun_nonfatal=1"


  


  In ffmpeg, the -re parameter makes the jitter small. But I didn't find which parameter does the same in gstreamer

  


• ffmpeg : advice on params to speed up converting to mp4 ?

  2 août 2022, par DapperDanh

  I am trying to minimize the time it takes to convert an input video file of various extensions to a mp4 file.

  


  Right now, I am simply using this :

  


  ffmpeg -y -i {inputFileName} convertOutput.mp4


  


  I have followed some advice on various forums, but nothing I change seems to impact the overall timing. Adding present flags does not seem to help me on my machine.

  


  For ex, all 3 of the following take roughly 10 seconds.

  


  ffmpeg -y -i "C:\_eraseme\ffmpeg\Wildlife.wmv" "C:\_eraseme\ffmpeg\Wildlife.mp4" 

ffmpeg -y -i "C:\_eraseme\ffmpeg\Wildlife.wmv" "C:\_eraseme\ffmpeg\Wildlife.mp4" -deadline realtime -cpu-used -16

ffmpeg -y -i "C:\_eraseme\ffmpeg\Wildlife.wmv" "C:\_eraseme\ffmpeg\Wildlife.mp4" -preset ultrafast


  


  I am hoping that maybe the fact I am always converting to mp4 there are some additional parameters that might make an impact ?

  


  Any suggestions or links one could recommend ?
Thanks,
Dan

  


• battery performance of vlc player on android

  7 juillet 2013, par rajneesh

  i want to support custom video file-format to be played on android.
  for the purpose i want to modify the vlc player for android, but i am concerned that vlc might be doing "software video decoding" and which might have impact on battery life.

  I want to understand the following

  1. Is there any battery life comparison between software and hardware decoding of video codecs.
  2. does vlc on android make use of hardware decoder.if available on phone ?
  3. does file format have any impact on the selection of hardware or software decoder