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• RTSP player volume control using FFMPEG iOS7

  21 mai 2014, par sansid1983

  I am able to show 2 RTSP video streams from 2 IP cameras by working on https://github.com/durfu/DFURTSPPlayer.

  The video plays smoothly and audio is also working fine. But i am unable to increase or decrease volume of each RTSPPlayer. FFMPEG framework is included in it. If any has an idea how i can enable this feature please do share.

• DivX audio not decoded on DVD player

  8 août 2019, par Shaul

  Moved to https://video.stackexchange.com/questions/28225/divx-audio-not-decoded-on-dvd-player

  I am converting MP4 movie into AVI/DivX format. I plan to copy the AVI to a USB memory stick and plug it into my DVD player. My player is a Pioneer 3052 that supports USB input.

  I convert the file using ffmpeg without error messages. The output file is played correctly on my computer, including audio. I use "Movies & TVs" and "DIVX Player" for testing.

  When I try running it on my Pioneer the video and the subtitles are ok but there’s no audio. I know that there’s no issues with the hardware because videos converted with "FreeMake Video converter" do play audio.

  My command line is :

  .\ffmpeg.exe  "-i INFILE -c:v mpeg4 -vtag xvid -qscale:v 3 -c:a libmp3lame  -vf "scale=720:576:force_original_aspect_ratio=decrease,pad=720:576:(ow-iw)/2:(oh-ih)/2","subtitles=f=SRTFILE:charenc=ISO-8859-8:force_style=PrimaryColour=&H0000FFFF,Fontsize=16" OUTFILE

  I also experimented with -b:a 192k, -b:a 96k and -qscale:a 4 all leading to the same results.

  I wander what else to try.
  I add the report produced by ffprobe (for the output file) :

  [STREAM]
  
  index=0
  
  codec_name=mpeg4
  
  codec_long_name=MPEG-4 part 2
  
  profile=Simple Profile
  
  codec_type=video
  
  codec_time_base=1001/24000
  
  codec_tag_string=xvid
  
  codec_tag=0x64697678
  
  width=720
  
  height=576
  
  coded_width=720
  
  coded_height=576
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=5:4
  
  pix_fmt=yuv420p
  
  level=1
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  quarter_sample=false
  
  divx_packed=false
  
  id=N/A
  
  r_frame_rate=24000/1001
  
  avg_frame_rate=24000/1001
  
  time_base=1001/24000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=163203
  
  duration=6806.925125
  
  bit_rate=1243432
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=163203
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=mp3
  
  codec_long_name=MP3 (MPEG audio layer 3)
  
  profile=unknown
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=U[0][0][0]
  
  codec_tag=0x0055
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=3/125
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=283622
  
  duration=6806.928000
  
  bit_rate=192000
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=283622
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  [/STREAM]
  
  [FORMAT]
  
  filename=H:\Movies\Memento.avi
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=avi
  
  format_long_name=AVI (Audio Video Interleaved)
  
  start_time=0.000000
  
  duration=6806.928000
  
  size=1235006020
  
  bit_rate=1451469
  
  probe_score=100
  
  TAG:encoder=Lavf58.20.100
  
  [/FORMAT]

  EDIT :
  I add an example of a movie that is OK on this DVD player :

  [STREAM]
  
  index=0
  
  codec_name=mpeg4
  
  codec_long_name=MPEG-4 part 2
  
  profile=Advanced Simple Profile
  
  codec_type=video
  
  codec_time_base=1001/24000
  
  codec_tag_string=XVID
  
  codec_tag=0x44495658
  
  width=576
  
  height=432
  
  coded_width=576
  
  coded_height=432
  
  has_b_frames=1
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=4:3
  
  pix_fmt=yuv420p
  
  level=5
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  quarter_sample=false
  
  divx_packed=false
  
  id=N/A
  
  r_frame_rate=24000/1001
  
  avg_frame_rate=24000/1001
  
  time_base=1001/24000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=134521
  
  duration=5610.646708
  
  bit_rate=943851
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=134521
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=mp3
  
  codec_long_name=MP3 (MPEG audio layer 3)
  
  profile=unknown
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=U[0][0][0]
  
  codec_tag=0x0055
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=3/125
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=233777
  
  duration=5610.648000
  
  bit_rate=91176
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=233777
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  [/STREAM]
  
  [FORMAT]
  
  filename=H:\Honey.I.Shrunk.The.Kids.1989.FS.DVDRip.XViD.iNT-EwDp.HebSub.www.Moridim.tv.avi
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=avi
  
  format_long_name=AVI (Audio Video Interleaved)
  
  start_time=0.000000
  
  duration=5610.648000
  
  size=734808064
  
  bit_rate=1047733
  
  probe_score=100
  
  TAG:encoder=VirtualDubMod 1.5.10.2 (build 2540/release)
  
  [/FORMAT]

• Can I make a seek accurate video player with ffmpeg ?

  5 septembre 2016, par Will Tower

  Simple question : I would like to make a video player with "fairly" accurate seeking and need to know if I can do that with ffmpeg. I think the answer is "Well, yeah of course you can" but want to get a reality check before I waste lots of time only to discover that I can’t.

  I am coding in Actionscript for a cross platform desktop AIR app. I am using a NativeProcess to run ffmpeg in the background and using Actionscript’s NetConnection and NetStream classes to connect the ffmpeg stream to a Video class. Using ffmpeg with a NativeProcess is essentially running ffmpeg from the command line. I have basic AS3 code roughed out to load and play a video through ffmeg and I am going through the dranger tutorial (How to Write a Video Player in
  Less Than 1000 Lines ) now to sort out the rest of it.

  Would appreciate hearing of any caveats or cautions.

  Update : So I have been fiddling with this all afternoon but no success yet. I am able to run a video with the following commands (NativeProcess code removed for clarity) :

  ffmpegArgs = new Vector.<string>();
  
  ffmpegArgs.push("-re", "-i",videoPath,"-c:a", "copy", "-c:v", "copy","-f", "flv", "-");
  
  </string>

  But I am confused about how to interact with ffmpeg once it is running. I’ve tried a bunch of variations on this scenario : using writeUTFBytes to send commands to the ffmpeg NativeProcess instance without a good result :

  var cmd:String = "-ss, 50, -re, -i," + videoPath + ",-c:a, copy, -c:v, copy, -f flv -";
  
  ffmpegProcess.standardInput.writeUTFBytes(cmd); 

  Do I need to tear down and respawn the ffmpeg NativeProcess instance in order to access different sections of a video file ?

  ---

  ss position (input/output)

  When used as an input option (before -i), seeks in this input file to position. Note that in most formats it is not possible to seek
  exactly, so ffmpeg will seek to the closest seek point before
  position. When transcoding and -accurate_seek is enabled (the
  default), this extra segment between the seek point and position will
  be decoded and discarded. When doing stream copy or when
  -noaccurate_seek is used, it will be preserved.

  When used as an output option (before an output filename), decodes but discards input until the timestamps reach position.

  https://ffmpeg.org/ffmpeg.html#Video-Options