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• How to accurately match an image to a video frame and exit with ffmpeg

  10 avril 2020, par Hans J

  In Bash,
I am trying to match an image to a frame in ffmpeg. I also want to exit the ffmpeg process when the match is found. Here is a (simplified version) of the code currently :

  



  ffmpeg --hide_banner -ss 0 -to 60 \
-i "video.mp4" -i "image.jpg" -filter_complex \
"blend=difference, blackframe" -f null - null 2>log.txt &
pid=$!
trap "kill $pid 2>/dev/null" EXIT
while kill -0 $pid 2>/dev/null; do
     # (grep command to monitor log file)
     # if grep finds blackframe match, return blackframe time
done


  



  To my understanding, if the video actually contains a blackframe I will get a false-positive. How can I effectively mitigate this ?

  



  While this is unnecessary to answer the question, I would like to exit the ffmpeg process without having to use grep to constantly monitor the log file, instead using pure ffmpeg

  



  Edit : I say this because while I understand the blend filter is computing the difference, I am getting a false positive on a blackframe in my video and I don't know why.

  



  Edit : A possible solution to this issue is to not use blackframe at all, but psnr (Peak Signal to Noise Ratio) but normal usage is by comparing two videos frame by frame, and I don't know how to effectively use it with an image as input.

  


• Match audio file with video file in batch (.bat)

  3 octobre 2019, par Jake Pearson

  i have done my research and found a fairly new thread that opened -> Finding File Matches & Variable Assignment using a .BAT Script

  However,it doesn’t seem like this person has same issue as me although they maybe using the same fotware for ingesting the videos as the naming convention says so.

  For me i have many different output names. the string in the output files has same name like the thread above -> channel_typeOfProgram_ID_DatesinString.m2v or .wav

  The one thing thast common is that before the date starts, i have High written in the file name followed by c in the video file name or 00, 01 for audio and i believe in the Finding File Matches & Variable Assignment using a .BAT Script the person who answer it made it clear that 00c is left audio and 01c is right audio.

  Here are example of the files names I get.

  Video

  BA_MUS_006606Highc450277**20190320**1831370611.m2v

  Audio

  BA_MUS_006606High00c450277201903201831370623.wav

  BA_MUS_006606High01c450277201903201831370625.wav

  or the file name would have BA_PRG_006606_02High01c45027720190320183137785

  so its a problem to break the code to using delimiters as the number of _ or segments are going to be different.

• FFMpeg Input link in1:v0 parameters (size > 640x352, SAR 0:1) do not match the corresponding output link in0:v0 > parameters [duplicate]

  25 avril 2020, par Android Developer

  I am using below command to concatenate videos-

  



  String command[] = {"-i",inputFile1AbsolutePath,"-i",inputFile2AbsolutePath .....,"-i",inputFileNAbsolutePath,"-filter_complex","[0:v0] [0:a0] [1:v1] [1:a1]...[N:vN] concat=n=N:v=1:a=1 [v] [a],"-map","[v]","-map","[a]", outputFileAbsolutePath};


  



  and got below error-

  



  


  FAILED with output : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the
 FFmpeg developers
 built with gcc 4.8 (GCC)
 configuration : —target-os=linux
 —cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
 —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot
 —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a —extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include
 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' —extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib
 -Wl,-z,relro -Wl,-z,now -pie' —extra-libs='-lpng -lexpat -lm' —extra-cxxflags=
 libavutil 55. 17.103 / 55. 17.103
 libavcodec 57. 24.102 / 57. 24.102
 libavformat 57. 25.100 / 57. 25.100
 libavdevice 57. 0.101 / 57. 0.101
 libavfilter 6. 31.100 / 6. 31.100
 libswscale 4. 0.100 / 4. 0.100
 libswresample 2. 0.101 / 2. 0.101
 libpostproc 54. 0.100 / 54. 0.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
 '/storage/emulated/0/Download/g3cm1tt7qtd41.mp4' :
 Metadata :
 major_brand : iso6
 minor_version : 1
 compatible_brands : mp42iso6avc1isom
 creation_time : 2020-01-30 11:13:07
 Duration : 00:00:00.00, start : 0.042667, bitrate : N/A
 Stream #0:0(und) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p,
 854x480 [SAR 2136:2135 DAR 89:50], 1225 kb/s, 30 fps, 30 tbr, 15360
 tbn, 60 tbc (default)
 Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 128 kb/s (default)
 Input #1, mov,mp4,m4a,3gp,3g2,mj2, from
 '/storage/emulated/0/WhatsApp/Media/WhatsApp
 Video/VID-20200404-WA0000.mp4' :
 Metadata :
 major_brand : mp42
 minor_version : 0
 compatible_brands : mp42isom
 Duration : 00:03:43.14, start : 0.000000, bitrate : 774 kb/s
 Stream #1:0(und) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p,
 640x352, 675 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
 Stream #1:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
 fltp, 96 kb/s (default)
 [Parsed_concat_0 @ 0xb4529400] Input link in1:v0 parameters (size
 640x352, SAR 0:1) do not match the corresponding output link in0:v0
 parameters (854x480, SAR 2136:2135)
 [Parsed_concat_0 @ 0xb4529400] Failed to configure output pad on
 Parsed_concat_0
 Error configuring complex filters.
 Invalid argument

  


  



  Seeing this answer i tried using-

  



  [0:v]setsar=1[v0]; [0:a0] [1:v]setsar=1[v1]; [1:a1]


  



  but did not worked !

  



  How can i resolve this ?