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• FFMPEG for thumbnail from video distorted when downloaded

  17 juillet 2020, par bjacobs

  I am grabbing a thumbnail image from an mp4.

  


  When I use -c:v mjpeg, the thumbnail appears fine in the browser, but is completely distorted when I preview it on my Mac. If I use -c:v jpeg2000 the image looks fine on my Mac, but it does not show in the browser.

  


  Full command :

  


  ffmpeg -ss 3 -i https://some_site/some_video.mp4 -vf thumbnail,scale=480:480 -q:v 2 -frames:v 1 -f image2 -c:v jpeg2000 -r 1 -vframes 1 tmp/my_thumbnail.jpg

  


  -vs-

  


  ffmpeg -ss 3 -i https://some_site/some_video.mp4 -vf thumbnail,scale=480:480 -q:v 2 -frames:v 1 -f image2 -c:v mjpeg -r 1 -vframes 1 tmp/my_thumbnail.jpg

  


  What encoding do I need to use in order for the generated thumbnail to both be viewable in the browser and also preview-able on Mac ?

  


  This is what the distorted image looks like :


  


  I'm beginning to think this is an macOS issue, but even if it is, I'd like to know if FFMPEG would have a solution for it so that even users with the buggy OS can properly preview the image.

  


  Output :

  


  ffmpeg version 4.1.5 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8.3.0 (Alpine 8.3.0)
  configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --disable-debug
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://some_site/some_video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1mp42
    creation_time   : 2020-02-28T16:46:30.000000Z
  Duration: 00:00:06.23, start: 0.000000, bitrate: 2004 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x480 [SAR 1:1 DAR 1:1], 1951 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2020-02-28T16:46:29.000000Z
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 48 kb/s (default)
    Metadata:
      creation_time   : 2020-02-28T16:46:29.000000Z
File 'tmp/my_thumbnail.jpg' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x55acb21fbb00] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'tmp/my_thumbnail.jpg':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1mp42
    encoder         : Lavf58.20.100
    Stream #0:0(und): Video: mjpeg, yuvj444p(pc), 480x480 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 1 fps, 1 tbn, 1 tbc (default)
    Metadata:
      creation_time   : 2020-02-28T16:46:29.000000Z
      encoder         : Lavc58.35.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
[Parsed_thumbnail_0 @ 0x55acb21e35c0] frame id #58 (pts_time=1.933333) selected from a set of 97 images
frame=    1 fps=0.0 q=2.0 Lsize=N/A time=00:00:01.00 bitrate=N/A dup=1 drop=1 speed=2.04x    
video:39kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


• ffmpeg only drawing last text

  24 juillet 2020, par Muhammad Mohsin Ajmal

  Im using ffmpeg in flutter using the flutter ffmpeg plugin. While experimenting with it this is what I am trying to do : Show text between 1 to 2 seconds and a different text between 3 to 4 seconds in video.

  


  Only the text mentioned between 3 to 4 seconds is shown. So for me only the last drawText would work. What am I missing here ?

  


  The is the list of arguments generated

  


   Running FFmpeg with arguments: [-y, -i, /storage/emulated/0/DCIM/Camera/20200707_234610.mp4, -i, /data/user/0/com.example.example/app_flutter/watermark.png, -filter_complex, [0:v][1:v]overlay=main_w-overlay_w-5:5 ,drawtext=fontfile='/data/user/0/com.example.example/app_flutter/font.ttf':fontsize=90:x=20:y=20:text='Testing':enable='between(t\,1\,2),drawtext=fontfile='/data/user/0/com.example.example/app_flutter/font.ttf':fontsize=90:x=20:y=260:text='OTHER TEXT':enable='between(t\,3\,4)'', -crf, 27, -preset, veryfast, -c:v, libx264, -r, 30, /data/user/0/com.example.example/cache/2020-07-21T07:50:39.206386.mp4]



  


• Manim error : It's a sound problem that I haven't seen anywhere else

  2 avril 2024, par Nεo Pλατo

  I've been using Manim for about a month now, and with already existing impediments to my progress none has been more painful than the lack of sound when I got to this part of Theorem of Beethoven's tutorial. I've been struggling with it for three weeks and opened issues on GitHub and Reddit without any success.

  


  So the code looks like this :

  


  class AudioTest(Scene):
    def construct(self):
        group_dots=VGroup(*[Dot()for _ in range(3)])
        group_dots.arrange_submobjects(RIGHT)
        for dot in group_dots:
            self.add_sound("click_this_and_nothing_else",gain=-10)
            self.add(dot)
            self.wait()
            self.wait()


  


  And the error message is a bit long and I'm still cracking at what it actually means. Here it is :

  


  C:\Manim\manim-18june>python manim.py tutorial\7_add_audio.py AudioTest -pm
Media will be written to C:/Users/NeoPlato/Videos/manim_videos\. You can change this behavior with the --media_dir flag.


Traceback (most recent call last):
  File "C:\Manim\manim-18june\manimlib\extract_scene.py", line 155, in main
    scene = SceneClass(**scene_kwargs)
  File "C:\Manim\manim-18june\manimlib\scene\scene.py", line 79, in __init__
    self.file_writer.finish()
  File "C:\Manim\manim-18june\manimlib\scene\scene_file_writer.py", line 379, in finish
    self.combine_movie_files()
  File "C:\Manim\manim-18june\manimlib\scene\scene_file_writer.py", line 506, in combine_movie_files
    self.audio_segment.export(
  File "C:\Users\allan\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pydub\audio_segment.py", line 911, in export
    raise CouldntEncodeError(
pydub.exceptions.CouldntEncodeError: Encoding failed. ffmpeg/avlib returned error code: 1

Command:['ffmpeg', '-y', '-f', 'wav', '-i', 'C:\\Users\\NEOPLATO~1.000\\AppData\\Local\\Temp\\tmpk6j8yj98', '-b:a', '312k', '-f', 'mp3', 'C:\\Users\\NEOPLATO~1.000\\AppData\\Local\\Temp\\tmpyn225uxk']

Output from ffmpeg/avlib:

ffmpeg version git-2020-06-17-0b3bd00 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
--enable-amf
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 92.100 / 58. 92.100
  libavformat    58. 46.101 / 58. 46.101
  libavdevice    58. 11.100 / 58. 11.100
  libavfilter     7. 86.100 /  7. 86.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'C:\Users\NEOPLATO~1.000\AppData\Local\Temp\tmpk6j8yj98':
  Duration: 00:00:04.23, bitrate: 2822 kb/s
    Stream #0:0: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s32, 2822 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s32le (native) -> mp3 (mp3_mf))
Press [q] to stop, [?] for help
[mp3_mf @ 011be000] could not find any MFT for the given media type
[mp3_mf @ 011be000] could not create MFT
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!



I do have a larger documentation of the problem with current progress [over at GitHub](https://github.com/3b1b/manim/issues/1152)

>Help
>>Me
>>>Please :(
>>>>Pardon my naive looking formatting, I'm new to Markdown