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• FFMPEG disabled automatic compression file

  2 novembre 2017, par HenrykVIII

  How to disable FFMPEG in its own compressed file compression, which does not come from the program code. This is when the file is merged (as the first task) or file stabilization (as the first task). I lose on file quality by reducing itself from 16k to 7k birate files (in parts) input.

  So, without loss, I have to merge files or stabilize them so that they do not change ?

  I will add that the effect does not affect every film - only the majority. None of which come out of a duel completely and eg for 16.2k input birate have output 16k birate .. What is no visible loss.

  But the loss from 16k to 7k is already visible on the details and especially the movies shot at night and in the wrong light.

  I enclose the wrapper code c # :
   
  The same situation occurs when the first task is to combine files :

  Can anyone help ?? : (((

• ffmpeg audio voices only on right side

  9 octobre 2022, par xavi

  I am converting some high quality movies to lower quality with this command :

  


  ffmpeg -i video.mp4 -vcodec libx265 -crf 28 output_video.mp4


  


  The output result causes that (in some cases) audio of voices are only reproduced on the right side of the earphones. I have to execute these two commands to have the proper audio :

  


  ffmpeg -i output_video.mp4 -map 0:a:0 -async 1 audio.mp3
ffmpeg -i output_video.mp4 -i audio.mp3 -c:v copy -map 0:v:0 -map 1:a:0 output_video_with_audio.mp4


  


  I have tried adding mapping parameters (-map 0:v:0 -map 0:a:0 -async 1) to the first command, but I have the same audio problem result.

  


  What can be causing this problem ?

  


• Android recorded video getting rotated after using ffmpeg

  6 novembre 2014, par Vaeianor

  I’m developing an android app, in which users can record a video, trim it, and then upload it to my server. I’m using the MediaRecorder class to handle the recording and using ffmpeg to trim the recorded video. The problem I’m having with ffmpeg is that the video is always getting rotated either 90 or 180 degrees after being trimmed. I know I can add a video filter (transpose=1) within the ffmpeg command to rotate the video. But that will require re-encoding the video. In my case, I don’t want to re-encode the video,as it takes too long. Instead, I’m having "-vcodec:copy" within ffmpeg command to use the same video codec.

  Because I’m setting an orientation hint to the media recorder, the media recorder always adds "rotate=90" or "rotate=180" to the video metadata. I think that’s why the video is always getting rotated by ffmpeg.
  So I was wondering if there is a way to rotate the video without re-encoding it. Or if there is a way to modify the metadata(rotate) of a recorded video before trimming it with ffmpeg.

  Please help ! The problem has been driving me crazy...

  Thanks in advance !

  Here is the ffmpeg command :

  /data/data/com.xxx.xxx/app_bin/ffmpeg -y -ss 00:00:00 -t 4.000000 -i    file:/storage/sdcard0/Movies/xxx/vid.mp4 -vcodec copy -acodec copy -metadata:s:v:0 rotate=0 -  strict -2 file:/storage/sdcard0/Movies/xxx/vid_new.mp4

  Below is the console output :

  I/ShellCallback : shellOut()(9781): ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
  I/ShellCallback : shellOut()(9781):   built on Nov 15 2013 00:50:10 with gcc 4.6 20120106 (prerelease)
  
  I/ShellCallback : shellOut()(9781):   configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --enable-small --prefix=/data/data/info.guardianproject.ffmpeg/app_opt --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk//toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk//platforms/android-3/arch-arm --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon' --extra-ldflags=-L../x264 --enable-version3 --enable-gpl --disable-doc --enable-yasm --enable-decoders --enable-encoders --enable-muxers --enable-demuxers --enable-parsers --enable-protocols --enable-filters --enable-avresample --enable-libfreetype --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --enable-muxer=md5
  
  I/ShellCallback : shellOut()(9781):   libavutil      51. 54.100 / 51. 54.100
  
  I/ShellCallback : shellOut()(9781):   libavcodec     54. 23.100 / 54. 23.100
  
  I/ShellCallback : shellOut()(9781):   libavformat    54.  6.100 / 54.  6.100
  
  I/ShellCallback : shellOut()(9781):   libavdevice    54.  0.100 / 54.  0.100
  
  I/ShellCallback : shellOut()(9781):   libavfilter     2. 77.100 /  2. 77.100
  
  I/ShellCallback : shellOut()(9781):   libswscale      2.  1.100 /  2.  1.100
  
  I/ShellCallback : shellOut()(9781):   libswresample   0. 15.100 /  0. 15.100
  
  I/ShellCallback : shellOut()(9781):   libpostproc    52.  0.100 / 52.  0.100
  
  I/ShellCallback : shellOut()(9781): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file:/storage/sdcard0/Movies/xxx/vid.mp4':
  
  I/ShellCallback : shellOut()(9781):   Metadata:
  
  I/ShellCallback : shellOut()(9781):     major_brand     : isom
  
  I/ShellCallback : shellOut()(9781):     minor_version   : 0
  
  I/ShellCallback : shellOut()(9781):     compatible_brands: isom3gp4
  
  I/ShellCallback : shellOut()(9781):     creation_time   : 2014-09-17 17:25:50
  
  I/ShellCallback : shellOut()(9781):   Duration: 00:00:04.69, start: 0.000000, bitrate: 2969 kb/s
  
  I/ShellCallback : shellOut()(9781):     Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, 2989 kb/s, 29.89 fps, 30 tbr, 90k tbn, 180k tbc
  
  I/ShellCallback : shellOut()(9781):     Metadata:
  
  I/ShellCallback : shellOut()(9781):       rotate          : 90
  
  I/ShellCallback : shellOut()(9781):       creation_time   : 2014-09-17 17:25:50
  
  I/ShellCallback : shellOut()(9781):       handler_name    : VideoHandle
  
  I/ShellCallback : shellOut()(9781):     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s
  
  I/ShellCallback : shellOut()(9781):     Metadata:
  
  I/ShellCallback : shellOut()(9781):       creation_time   : 2014-09-17 17:25:50
  
  I/ShellCallback : shellOut()(9781):       handler_name    : SoundHandle
  
  I/ShellCallback : shellOut()(9781): Output #0, mp4, to 'file:/storage/sdcard0/Movies/xxx/vid_new.mp4':
  
  I/ShellCallback : shellOut()(9781):   Metadata:
  
  I/ShellCallback : shellOut()(9781):     major_brand     : isom
  
  I/ShellCallback : shellOut()(9781):     minor_version   : 0
  
  I/ShellCallback : shellOut()(9781):     compatible_brands: isom3gp4
  
  I/ShellCallback : shellOut()(9781):     creation_time   : 2014-09-17 17:25:50
  
  I/ShellCallback : shellOut()(9781):     encoder         : Lavf54.6.100
  
  I/ShellCallback : shellOut()(9781):     Stream #0:0(eng): Video: h264 (![0][0][0] / 0x0021), yuv420p, 720x480, q=2-31, 2989 kb/s, 29.89 fps, 90k tbn, 90k tbc
  
  I/ShellCallback : shellOut()(9781):     Metadata:
  
  I/ShellCallback : shellOut()(9781):       handler_name    : VideoHandle
  
  I/ShellCallback : shellOut()(9781):       creation_time   : 2014-09-17 17:25:50
  
  I/ShellCallback : shellOut()(9781):       rotate          : 0
  
  I/ShellCallback : shellOut()(9781):     Stream #0:1(eng): Audio: aac (@[0][0][0] / 0x0040), 44100 Hz, mono, 128 kb/s
  
  I/ShellCallback : shellOut()(9781):     Metadata:
  
  I/ShellCallback : shellOut()(9781):       creation_time   : 2014-09-17 17:25:50
  
  I/ShellCallback : shellOut()(9781):       handler_name    : SoundHandle
  
  I/ShellCallback : shellOut()(9781): Stream mapping:
  
  I/ShellCallback : shellOut()(9781):   Stream #0:0 -> #0:0 (copy)
  
  I/ShellCallback : shellOut()(9781):   Stream #0:1 -> #0:1 (copy)
  
  I/ShellCallback : shellOut()(9781): Press [q] to stop, [?] for help
  
  I/ShellCallback : shellOut()(9781): frame=  120 fps=0.0 q=-1.0 Lsize=    1530kB time=00:00:03.98 bitrate=3147.1kbits/s    
  
  I/ShellCallback : shellOut()(9781): video:1462kB audio:62kB global headers:0kB muxing overhead 0.329934%
  
  I/ShellCallback : shellOut()(9781): ret 0, stream_spec v:0