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• Android : FFmpeg taking high memory/cpu usage causing crash

  29 janvier 2019, par dastan

  I compiled ffmpeg for android, enabled mediacodec and jni. its works but when I merge HD video 60fps, its crash the app. this ffmpeg cmd I am using.

  [-y, -benchmark, -ss, 0.0, -t, 11.541, -i, VID_HD.mp4, -filter_complex, [0:v]setpts=PTS-STARTPTS,scale=1080.0:1920.0:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:color=#000000, -c:v, libx264, -c:a, aac, -ac, 2, -ar, 44100, -preset, ultrafast, -strict, -2, VID_HD.ts]
  

  Sometimes I get these error for same cmds, but when I rerun, it works and sometimes these, if I rerun 3-4 times its restart the app. maybe because of memory is not cleaning. Help me here.

  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  VideoKit:Error: Failed to inject frame into filter network: Out of memory
  
  VideoKit:Error: Error while processing the decoded data for stream #0:0
  

  I need help in cleaning FFmpeg also when execution finished and I call my run(FFmpeg cmds) method for next video encoding it restart the app, I am suspecting because of memory usage.

• Getting color mismatch while converting from NV12 raw data to H264 using FFMPEG

  29 janvier 2019, par Harshil Makwana

  I am trying to convert NV12 raw data to H264 using hw encoder of FFMPEG.

  to pass raw data to encoder I am passing AVFrame struct using below logic:

      uint8_t * buf;
      buf = (uint8_t *)dequeue();
      frame->data[0] = buf;
      frame->data[1] = buf + size;
      frame->data[2] = buf + size;
      frame->pts = frameCount;
      frameCount++;
  

  but using this logic, I am getting, color mismatched H264 data,

  Can someone tell me , How to pass buffer to AVFrame data?

  Thanks in Advance, Harshil

• How to convert video and output to BytesIO without saving ?

  29 janvier 2019, par Cat Moki

  Using ffmpy to convert video(or gif image) that uploaded. I want to convert the file without saving (i.e. input is a BytesIO, and output with a BytesIO). How can I do that?

• Create 30fps time-lapse video from 30fps source with frame interpolation

  29 janvier 2019, par 350D

  I'm trying to convert video source to time-lapse using this method:

  ffmpeg -i source.mp4 -an -filter:v "setpts=PTS/360" timelapse.mp4

  but I don't like this choppy and jumpy output video due dropping frames with PTS/360 option. I've tried to use tblend=average,framestep=2,setpts=PTS/360 but it looks the same and doublicating this filter like

  tblend=average,framestep=2,tblend=average,framestep=2,tblend=average,framestep=2,...setpts=PTS/180
  

  doesn't make any visible difference for me.

  Is there any other options with ffmpeg to blend 30 frames to 1 averaged frame and compile output 30fps video using these frames?

• Hide or show overlay with sendcmd

  28 janvier 2019, par Сергей Сергеев

  Sendcmd in ffmpeg

  Can I hide the overlay and then show it with sendcmd?