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• I keep having the message "MovieWriter ffmpeg unavailable ; using Pillow instead." I want to save as MP4 an animation

  6 décembre 2023, par Enrra

  I am doing an animation :

  


  animation = FuncAnimation(fig, update, frames=len(time_values), interval=250, repeat=False)
with a simple frame update function, I want it save it as a MP4 format :

  


  animation.save(f'{save_path}/heat_map.mp4', writer='ffmpeg', fps=10)

  


  I get the error message "MovieWriter ffmpeg unavailable ; using Pillow instead."

  


  I tried to do the following :

  


  plt.rcParams['animation.ffmpeg_path'] ='C:\\ProgramData\\Anaconda3\\LIB\\site-packages\\ffmpeg'
FFwriter = animation.FFMpegWriter()
animation.save(f'{save_path}/heat_map.mp4', writer = FFwriter, fps=10)


  


  This gets me an error message :

  


  Traceback (most recent call last):&#xA;  File "Graph_V1-8.py", line 406, in <module>&#xA;    FFwriter = animation.FFMpegWriter()&#xA;AttributeError: &#x27;FuncAnimation&#x27; object has no attribute &#x27;FFMpegWriter&#x27;&#xA;</module>

  


  and I also tried to do the following :
animation.save(f'{save_path}/heat_map.mp4', writer='ffmpeg', fps=10, codec='libx264')

  


  which also get me the error :
"MovieWriter ffmpeg unavailable ; using Pillow instead."

  


  When I write :

  


  pip install ffmpeg
Requirement already satisfied: ffmpeg in c:\programdata\anaconda3\lib\site-packages (1.4)


  


  Thank you in advance for your help

  


• How to "mimic" -c copy when using filters with ffmpeg ? Is there a built-in feature or I'll need some scripting ? [closed]

  29 décembre 2023, par Fabio Freitas

  I'm aware that any stream ffmpeg processes is decoded before applying any desired changes and then re-encoded, which means the stream in question can't simply be copied with -c copy.

  


  Still, I'm not yet very knowledgeable on dealing with media files. Currently, the single issue I'm addressing is cropping black bars from the sides when 4:3 is encoded as 16:9.

  


  That's fairly simple, and I quickly managed to get it going.

  


  Then I noticed some weird stuff via mediainfo and the explorer's side panel. Stream sizes, bitrates and some other details were different than expected.

  


  ---

  


  That's where -c copy comes in. Over the years, every time I tried to solve this, answers would stop at "-c copy can't be used if the stream will be decoded", which is good enough to stop noobs like me from wasting time.

  


  But since I don't know how to use advanced encoding settings, the -c copy I'm looking for is actually how can I re-encode my processed stream using the same (or most similar) settings used before I decoded it.

  


  Is there such an option in ffmpeg ? Are these settings I'm looking for even obtainable by any means ? And if "no" and "yes", could I use ffprobe to write a script for ffmpeg ?

  


  BTW, I'm on Windows 11, but I have Git's SCM tools available.

  


• How should I make ffmpeg "-ignore_unknown" work ?

  10 janvier 2024, par living being

  I'm batch-converting some videos and I want ffmpeg to just drop any unknown stream instead of failing and leaving the video untouched.

  


  My code :

  


  find ./ -type f -iname '*.mp4' -exec bash -c 'var="{}" && ffmpeg -i "{}" -map 0 -vcodec libx265 -preset fast -crf 31 -vf "scale=-2:min(1080\,ih)" -acodec libopus -ac 1 -b:a 24K -c:s copy -ignore_unknown "$var.mp4" -y && rm -v "$var" && mv -- "$var.mp4" "$var"' \;


  


  streams :

  


  Stream #0:0[0x1](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 105 kb/s (default)
Metadata:
  creation_time   : 2012-02-07T06:23:20.000000Z
  handler_name    : Apple Sound Media Handler
  vendor_id       : [0][0][0][0]
Stream #0:1[0x2](eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 320x240, 491 kb/s, 30.12 fps, 30.12 tbr, 2500 tbn (default)
Metadata:
  creation_time   : 2012-02-07T06:23:20.000000Z
  handler_name    : Apple Video Media Handler
  vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](eng): Data: none (rtp  / 0x20707472), 511 kb/s
Metadata:
  creation_time   : 2012-02-07T06:23:20.000000Z
  handler_name    : hint media handler
Stream #0:3[0x4](eng): Data: none (rtp  / 0x20707472), 109 kb/s
Metadata:
  creation_time   : 2012-02-07T06:23:20.000000Z
  handler_name    : hint media handler
Stream mapping:
Stream #0:0 -> #0:0 (aac (native) -> opus (libopus))
Stream #0:1 -> #0:1 (h264 (native) -> hevc (libx265))
Stream #0:2 -> #0:2 (copy)
Stream #0:3 -> #0:3 (copy)


  


  In the end I get this :

  


  [mp4 @ 0x55f412caa240] Could not find tag for codec none in stream #2, codec not currently supported in container
[out#0/mp4 @ 0x55f412c97ec0] Could not write header (incorrect codec parameters ?): Invalid argument
[vost#0:1/libx265 @ 0x55f412ec3d00] Error initializing output stream: 
[libopus @ 0x55f412ec3200] 1 frames left in the queue on closing

encoded 0 frames
Conversion failed!


  


  

  


  OS : Ubuntu 23.10

  


  I know I can do it by eliminating "-map 0", but I want to include all subtitle streams and other types of known streams if any. I need to use this for terabytes of videos, so I can't totally exclude data streams either, since there are some useful ones.