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• how to use FFMPEG to transcode h264 to h265 on Ubuntu 12.04 ?

  13 avril 2021, par ching

  I am ching.

  


  I use the following command to transcode h264 to h265.

  


  ffmpeg -i input.mp4 -c:v libx265 -crf 26 -preset fast -c:a aac -b:a 128k output.mp4


  


  But the result is

  


  


  Unknown encoder 'libx265'

  


  


  But I have compiled h265 by the following command before using the above command.

  


  sudo apt-get install cmake mercurial
cd ~/ffmpeg_sources
hg clone https://bitbucket.org/multicoreware/x265
cd ~/ffmpeg_sources/x265/build/linux
PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED:bool=off ../../source
make
make install


  


  Then, I use ffmpeg -codecs to check if it supports to encode h265.

  


  The result is

  


  


  D.V.L. hevc H.265 / HEVC (High Efficiency Video Coding)

  


  


  It seems that ffmpeg does not support h265.

  


  How can I solve this problem ?

  


• How to make all the edit in just one command ?

  2 août 2023, par bartche

  I'm new to ffmpeng so perdon me if it is a stupid question but I've been trying to put these 2 lines together and everytime it show me some different error.

  


  Command that runs first :

  


  ffmpeg -i input.mp4 -filter_complex pad="in_w:in_h+150:0:0",subtitles="subtitle.srt:force_style='Fontsize=24,PrimaryColour=&H000CCFF&,Bold,Shadow=12'" -vcodec libx264 output.mp4


  


  Command that runs second :

  


  ffmpeg -i output.mp4 -i input2.mp4 -filter_complex "[1][0]scale2ref=iw:iw*(1/2)[sat][ep];[ep][sat]vstack",pad="in_w:in_h+240:0:-120",drawtext="fontfile=/home/ubuntu/test/rhumasinera.ttf:text='My Text Here':fontcolor=red:fontsize=82:x=15:y=30",drawtext="fontfile=/home/ubuntu/test/rhumasinera.ttf:text='My Text Here':fontcolor=red:fontsize=82:x=15:y=880" -vcodec libx264 output2.mp4


  


  Not sure what I'm doing wrong since it works running the commands separateded. Wanting to do just in one code to make it faster.

  


• ffmpeg : merge two video gives error

  7 février 2015, par gderaco

  Command is :

  ./ffmpeg -i /sdcard/video.mp4 -i /sdcard/video-zoom.mp4 -strict -2 -threads 5 -preset ultrafast -filter_complex [0:0][0:1][1:0][1:1]concat=n=2:v=1:a=1[v][a] -map ’[v]’ -map ’[a]’ /sdcard/video-final.mp4

  Output is : WARNING : linker : ./ffmpeg has text relocations. This is
  wasting memory and is a security risk. Please fix. ffmpeg version
  n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers built on Oct 7
  2014 15:08:46 with gcc 4.8 (GCC) configuration : —target-os=linux
  —cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
  —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-fontconfig —enable-pthreads —disable-debug —disable-ffserver —enable-version3 —enable-hardcoded-tables —disable-ffplay —disable-ffprobe —enable-gpl —enable-yasm —disable-doc —disable-shared —enable-static —pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon —extra-cflags=’-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include
  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon’ —extra-ldflags=’-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib
  -Wl,-z,relro -Wl,-z,now -pie’ —extra-libs=’-lpng -lexpat -lm’ —extra-cxxflags= libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 /
  56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 /
  53. 0.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’/sdcard/video.mp4’ : Metadata :
  major_brand : mp42
  minor_version : 0
  compatible_brands : mp42isomavc1
  creation_time : 2010-03-20 21:29:11
  encoder : HandBrake 0.9.4 2009112300 Duration : 00:00:05.57, start : 0.000000, bitrate : 551 kb/s
  Stream #0:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr,
  90k tbn, 60 tbc (default)
  Metadata :
  creation_time : 2010-03-20 21:29:11
  encoder : JVT/AVC Coding
  Stream #0:1(eng) : Audio : aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
  Metadata :
  creation_time : 2010-03-20 21:29:11 Input #1, mov,mp4,m4a,3gp,3g2,mj2, from ’/sdcard/video-zoom.mp4’ : Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : isomiso2avc1mp41
  encoder : Lavf56.4.101 Duration : 00:00:05.00, start : 0.000000, bitrate : 1901 kb/s
  Stream #1:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuvj420p(pc), 1280x720, 1899 kb/s, 25 fps, 25 tbr, 12800
  tbn, 50 tbc (default)
  Metadata :
  handler_name : VideoHandler

  Stream specifier ’:1’ in filtergraph description
  [0:0][0:1][1:0][1:1]concat=n=2:v=1:a=1[v][a] matches no streams.

  ---