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• [Turmux][ffmpeg] encounter "can't open stat file" when use "-pass"

  15 février 2020, par Jackal Zhao

  I installed ffmpeg in turmux, in my home directory, ran :

  ffmpeg -y -i /sdcard/FFMPEG/in.mp4 -c:v libx264 -b:v 2600k -pass 2 -c:a copy /sdcard/FFMPEG/out3.mp4

  the error bumps :

  ratecontrol_init: can't open stats file

  if I enter /sdcard/FFMEPG folder first, then run
  ffmpeg -y -i /sdcard/FFMPEG/in.mp4 -c:v libx264 -b:v 2600k -pass 2 -c:a copy /sdcard/FFMPEG/out3.mp4
  the task will run successfully.

  then I went back to turmux home directory, ran
  ffmpeg -y -i /sdcard/FFMPEG/in.mp4 -c:v libx264 -b:v 2600k -pass 2 -c:a copy /sdcard/FFMPEG/out3.mp4
  , error still happens.

  so I then added -strict -2 -passlogfile /tmp/mydummy and ran ran
  ffmpeg -y -i /sdcard/FFMPEG/in.mp4 -c:v libx264 -strict -2 -passlogfile /sdcard/FFMPEG/ -b:v 2600k -pass 2 -c:a copy /sdcard/FFMPEG/out3.mp4
  , and same error still happens.

  My question is, how to use ffmpeg "-pass" in termux successfully without especially entering the target folder ?

• Why Do Some of the Codecs in FFMPEG's Supported Codec List Show "encoders :" or "decoders :" in Parenthesis ?

  4 mai 2020, par spaceman

  If you open the Command Prompt, and run ffmpeg -codecs,
  
you will get a long list of Codecs that FFMPEG supports.

  



  Here's a small sample of the list :

  



   DEV.L. h261                 H.261
 DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
 D.V.L. h263i                Intel H.263
 DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)
 D.V.LS hevc                 H.265 / HEVC


  



  Now If you briefly go over the whole list,
  
you see that most Codecs in this list appear with their Name and Description,
  
but some of the Codecs also include parenthesis in the Description, and in the parenthesis,
  
they specify "encoders :" or "decoders :".

  



  For example :

  



  1)

  



   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)


  



  2)

  



   DEVILS jpeg2000             JPEG 2000 (decoders: jpeg2000 libopenjpeg) (encoders: jpeg2000 libopenjpeg)


  



  3)

  



   DEV.L. msmpeg4v3            MPEG-4 part 2 Microsoft variant version 3 (decoders: msmpeg4) (encoders: msmpeg4)


  



  4)

  



   DEA.L. aac                  AAC (Advanced Audio Coding) (encoders: aac libvo_aacenc)


  



  5)

  



   DEA.L. amr_nb               AMR-NB (Adaptive Multi-Rate NarrowBand) (decoders: amrnb libopencore_amrnb) (encoders: libopencore_amrnb)
 DEA.L. amr_wb               AMR-WB (Adaptive Multi-Rate WideBand) (decoders: amrwb libopencore_amrwb) (encoders: libvo_amrwbenc)


  



  My question :

  



  Why do some Codecs have those parenthesis, specifying Encoders/Decoders,
  
while other (in fact : most) codecs don't have these parenthesis ?

  


• ffmpeg : edit metadata and automatically increment their name + set the value of "Title" based on "Name"

  29 décembre 2018, par J. Does

  This PowerShell code divides a large audio file (sound1) in 5 minutes parts and saves them as sound100_1.mp3, sound1_002.mp3...

  ffmpeg -i $file_name_complete -f segment -segment_time 300 -c copy $fileNameOnly"_"%03d$fileExtensionOnly

  • How can I set the metadata title to be the same than the file name ?

  • And how can I also (on the same time) edit the Album metadata with an incremental name (it’s useless, but it’s to understand how that work). It should be alb_1, alb_2.

  I have seen on the docs that I should use :

  -metadata title="my title"

  But :

  • should I repeat each time -metadata for each metadata ? EDIT : yes according to this

  • how can I increment the number since the title need to be quoted (-metadata title="$fileNameOnly""_"%03d won’t work since the last quote is missing)

  • how can I set the title field so it take the same value than the Name ?

  ---

  This did not work :

  ffmpeg -i $file_name_complete -f segment -segment_time 300 
  
         -metadata title="$fileNameOnly""_"%03d album="test" 
  
         -c copy $fileNameOnly"_"%03d$fileExtensionOnly

  I get this error :

  -metadata : The term ’-metadata’ is not recognized as the name of a cmdlet