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• DirectShow RTSP SourceFilter with MPEG-4 Video Stream

  5 octobre 2011, par 6.45.Vapuru

  I create a simple direct show source filter using FFmpeg.I read rtp packets from RTSP source and give them to decoder. It works for h264 stream.

  MyRtspSourceFilter[H264 Stream] ---> h264 Decoder --> Video Renderer

  The bad news is that it does not work for MPEG-4. I can able to connect my rtsp source filter with MPEG-Decoder. I got no exception but video renderer does not show anything. Actually just show one frame then nothing [just stop]... Decoders and Renderers are 3rd party so i can not debug them.

  MyRtspSourceFilter[MP4 Stream] ---> MPEG-4 Decoder --> Video Renderer

  I can able to get rtp packets from MPEG-4 RTSP Source using FFmpeg sucessfully.There is no problem with it.

  It seems that i have not set something(?) in my Rtsps Source
  Filter which is not necessary for H264 stream but may be important for
  MPEG-4 stream

  What may cause this h264 stream and MPEG-4 stream difference in a direct show rtsp source filter ? Any ideas.

  More Info :

  — First i try some other rtsp source filters for MPEG-4 Stream...Although my rtsp source is same i see different subtypes in their pin connections.

  — Secondly i realy get suspicious if the source is really MPEG-4 SO i check with FFmpeg...FFmpeg gives the source codec id as "CODEC_ID_MPEG4".

  Update :
  [ Hack ]

  I just set m_bmpInfo.biCompression = DWORD('xvid') it just worked fine...But it is static. How to dynamically get/determine this value using ffmpeg or other ways...

• Android : How to record the mobile screen without using USB cable ?

  21 juin 2012, par Rajesh

  I want to build an application which would record my screen activities and would store them in a video file.

  1) I need to take the screenshots of my screen movements at periodic intervals and store them on the SD card.

  2) How can I create the video from the images which are already available on my SD card. I have tried with the FFMPEG. But I have encountered a few problems I don't know how to solve. The truth is I don't know the program to convert them.

  3 ) Is it possible to show the picture in my camera ?? That means if a user opens the camera from my app, it should show the pictures which are available on the SD card. If so, please advice me.

  EDIT : I have made a sample which can capable of taking 7 screen shots per second.

  Thanks,
  Rajesh .

• Merge the .mp4 video file with the .srt file in Hebrew language

  18 octobre 2023, par ZONEX

  I am looking for a solution using Python or CMD with FFmpeg to merge my Hebrew language .srt file with my .mp4 file.
Thanks for everyone !.

  


  I have tried using this command

  


  ffmpeg -i show.mp4 -vf "subtitles=show.srt:force_style='FontName=Arial,FontSize=24,PrimaryColour=&H00FFFF00&'" -c:v libx264 -c:a aac -strict experimental -scodec mov_text mysubtitledmovie.mp4

  


  However, I encountered the error message : 'Invalid UTF-8 in decoded subtitles.' I understand that I need to add Hebrew encoding support, but I haven't found how to do that.

  


  it's important to me that it'll be very fast process to add the .srt Hebrew file to .mp4 file.