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• How to parse raw file extracted from system/bin/fb0 to .png file in android

  9 octobre 2015, par user2750644

  I know this is question was already asked on stack overflow, but none were helped. Basically i wanted to extract screenshot of another app programatically, for which i managed to get raw formatted image from dev/graphics/fb0 from my rooted device. When i opened this image, it looked as shown below.

  I would be thankful if someone could provide, solution which would convert this raw image into .PNG format.

  

  Above image is screen shot of this.

  

• Converting .3gp file into mp4 file in android using ffmpeg

  8 août 2013, par user2171513

  I want to convert .3gp file into .mp4 file with resolution modified in Android using ffmpeg.
  I want to increase the resolution of the video from its standard resolution to 1920x1080.

  So far I have been successful in
  1) extracting .h264 video file from .3gp file and increase its resolution
  2) extracting .aac audio file from .3gp file.

  Now I want to combine them back into .mp4 file. The commands that I have used to extract this .h264 and .aac files are :

  ./ffmpeg -i 1.3gp -vbsf h264_mp4toannexb -s 1920x1080 1.h264
  
  ./ffmpeg -i 1.3gp -ab 160k -ac 2 -ar 48000 -vn -strict -2  1.aac

  The command that I have tried to merge them back is

  ./ffmpeg -i 1.h264 -i 1.aac -map 0:0 -map 1:0 -strict -2 1.mp4

  The 1.mp4 that gets generated at the end basically has audio only at few sync frames of video. (Thats what I feel , because the audio is present at specific intervals within the video)

  Can anyone please help in figuring out what am I missing here.

  EDIT :
  So basically I want to concat 4 different videos of 4 different resolution and type.

  1)

  ./ffmpeg -i 1.mp4 
  
  Video: h264 (High), yuv420p, 1920x1080, 16959 kb/s, 29.85 fps, 90k tbr, 90k tbn, 180k tbc
  
  Audio: aac, 48000 Hz, stereo, s16, 106 kb/s

  2)

  ffmpeg -i 2.mp4
  
  Video: h264 (Constrained Baseline), yuv420p, 640x480, 3102 kb/s, 29.99 fps, 90k tbr, 90k tbn, 180k tbc
  
  Audio: aac, 48000 Hz, stereo, s16, 93 kb/s

  3)

  ffmpeg -i 3.3gp
  
  Video: h263, yuv420p, 1408x1152 [PAR 12:11 DAR 4:3], 2920 kb/s, 15 fps, 15 tbr, 15360 tbn, 29.97 tbc
  
  Audio: amrnb, 8000 Hz, 1 channels, flt, 12 kb/s

  4)

  ffmpeg -i 4.3gp
  
  Video: h264 (High), yuv420p, 352x288 [PAR 12:11 DAR 4:3], 216 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc
  
  Audio: aac, 44100 Hz, stereo, s16, 92 kb/s

  So I am converting them to mpegts using following commands

  ./ffmpeg -i 1.mp4 -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 1.ts
  
  ./ffmpeg -i 2.mp4 -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 2.ts
  
  ./ffmpeg -i 3.3gp -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 3.ts
  
  ./ffmpeg -i 4.3gp -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 4.ts

  then concatenating the .ts files into f.ts and then creating a final .mp4 file from it using

   cat 1.ts 2.ts 3.ts 4.ts > f.ts
  
  ./ffmpeg -i f.ts -c copy -bsf:a aac_adtstoasc output.mp4

  But my f.ts also doesnt seem to play correctly in VLC on linux, it plays first 2 mp4's video + audio and it plays last .3gp's audio only.(Same for output.mp4 too) Could you please help me in figuring out what am I missing ?

  Thanks

• ffmpeg command to get master manifest file in hls where all renditions are pointed to a single m3u8 file [closed]

  28 décembre 2023, par user2975644

  ffmpeg command to get master manifest file in hls where all renditions are pointed to a single m3u8 file.The video reolutions are 360p,540p,720p and 1080p.

  


  I have tried with the below command but unable to get the desired output :

  


  ffmpeg -i Test_video.mp4

  


  -c:v libx264 -g 48 -keyint_min 48 -sc_threshold 0 -c:a aac -b:a 64k

  


  -vf "scale=640:360" -b:v 500k -maxrate 100k -bufsize 1000k -profile:v main -level 3.1 -f hls -hls_time 10 -hls_list_size 0 -hls_segment_filename 360p%03d.ts 360p.m3u8

  


  -vf "scale=960:540" -b:v 800k -maxrate 1600k -bufsize 1000k -profile:v main -level 3.1 -f hls -hls_time 10 -hls_list_size 0 -hls_segment_filename 540p%03d.ts 540p.m3u8

  


  -vf "scale=1280:720" -b:v 1500k -maxrate 3000k -bufsize 3000k -profile:v main -level 3.1 -f hls -hls_time 10 -hls_list_size 0 -hls_segment_filename 720p%03d.ts 720p.m3u8

  


  -vf "scale=1920:1080" -b:v 3000k -maxrate 6000k -bufsize 6000k -profile:v main -level 3.1 -f hls -hls_time 10 -hls_list_size 0 -hls_segment_filename 1080p%03d.ts 1080p.m3u8

  


  hls_playlist_type vod -master_pl_name master.m3u8