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  • FFMPEG and Matplotlib for animations - strange outputs ?

    27 juin 2020, par user13132640

    I'm trying to create animations using FFMPEG and matplotlib. Using the below code, I am creating the FFMpeg writer, and then using a loop, writing a series of graphs to the animation. However, the outputs I'm getting are very strange ; sometimes, when I watch the .mp4 file, the first 5 seconds are blank, then the video "ends" (the playback time on my media player says that it's complete), and at that point, my animation shows up. Other times, some frames are missing or skipped. I've tried searching around, but frankly I haven't found anyone with similar issues.

    


    I just installed the latest version of FFMpeg today.

    


    FFMpegWriter = manimation.writers['ffmpeg']
metadata = dict(title='Animation test', artist='name')
writer = FFMpegWriter(fps=1, metadata=metadata) # 1 frames per second, each year is 1 second


    


    Then, the plotting part...(I've excluded the code where I setup the fig, ax etc.)

    


    with writer.saving(fig, "animation.mp4", dpi=200):
    year = "2005"
    for i in range(4):

        d1_plot = d1[d1['Year'].str.contains(year, na=False)]
        ax.scatter(d1_plot["Lat"], d1_plot["Long"], c='g', s=d1_plot["Size"], transform=ccrs.PlateCarree())
        ax.set_title(year)
        writer.grab_frame()
        year = str(int(year)+1)


    


  • ffmpeg transparent background with colorkey shows background bleeding

    2 novembre 2022, par Jan

    I am creating a video with transparent background video with the following command. After creation I want to overlay this video on another video

    


    ffmpeg -f lavfi -i color=red:s=1920x1080,colorkey=red,format=rgba -loop 1 -t 0.08 -i "CreditWhite.png" -filter_complex "[1:v]scale=1920:-2,setpts=if(eq(N\,0)\,0\,1+1/0.02/TB),fps=60[fg]; [0:v][fg]overlay=y=-'t*h*0.02':eof_action=endall[v]" -map "[v]" -pix_fmt yuva444p10le -vcodec prores_ks credits.mov


    


    Creating the video works fine but when I overlay this on another video (using openshot) I get a lot of color bleeding of the background colour around the edges. Any suggestions to improve the ffmpeg prompt to stop this from happening ? I tried very slightly increasing the opacity (0.06) as mentioned in another thread without success.
Video uploaded to youtube for reference

    


    UPDATE

    


    Using different colours had the same effect
enter image description here

    


  • My FFMPEG throws me unexpected errors while writing a Thumbnail to the songs

    4 mars 2019, par Harmonised7

    I am using Node to execute my ffmpeg. I use this wrapper :

    https://www.npmjs.com/package/ffmpeg

    Everything was fine when I was using smaller versions of the thumbnails provided by Youtube, but when I attempted the HD ones, it suddenly started giving me an error. I’ve tried -pix_fmt yuv422p and Many other pixel formats, but nothing helped. Though ONE out of 100+ songs did tag successfully.

    here is my code :

    downloadTags(tags.thumbnail, `./thumbnails/${tags.title}.jpg`).then(thumbnail =>
    
                    {
    
                        video.addCommand('-i', `"${thumbnail}"`);
    
                        video.addCommand('-map', '0');
    
                        video.addCommand('-map', '1');
    
                        video.addCommand('-c', 'copy');
    
                        video.addCommand('-c:v:1', 'png');
    
                        video.addCommand('-disposition:v:0', 'attached_pic');
    
                        if(tags.title)
    
                            video.addCommand('-metadata', `title="${tags.title}"`);
    
                        if(tags.artist)
    
                            video.addCommand('-metadata', `artist="${tags.artist}"`);
    
                        if(tags.id)
    
                            video.addCommand('-metadata', `comment="https://www.youtube.com/watch?v=${tags.id}"`);
    
                        video.addCommand('-pix_fmt', `yuv422p`);
    

    

    
                        var output = 'downloaded'
    
                        if (outFolder)
    
                        {
    
                            output = outFolder;
    
                            if(!fs.existsSync(output)) fs.mkdirSync(output);
    
                        }
    

    
                        video.save(`"./${output}/${tags.title}.${tags.format}"`, function (error, file) 
    
                        {
    
                            if (error)
    
                            {
    
                                resolve(error);
    
                                return
    
                            }
    
                            try
    
                            {
    
                                fs.unlinkSync(song);
    
                            }
    
                            catch(err)
    
                            {
    
                                console.log(err.code);
    
                            }
    
                            resolve();
    

    
                        });
    
                    });
    

    
                }

    and here is my error :

    E

    RROR: Error: Command failed: ffmpeg -i "songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a" -y  -i "./thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg" -map 0 -map 1 -c copy -c:v:1 png -disposition:v:0 attached_pic -metadata title="&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]" -metadata artist="AReallyLongAndAwesomeNameThatIsBetterThanYoursInEveryPossibleWay" -metadata comment="https://www.youtube.com/watch?v=HprdvIIpR-I" "./written/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a"
    
ffmpeg version N-93214-g7e4d3dbe18 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 8.2.1 (GCC) 20190212
    
  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-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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
    
  libavutil      56. 26.100 / 56. 26.100
    
  libavcodec     58. 47.102 / 58. 47.102
    
  libavformat    58. 26.101 / 58. 26.101
    
  libavdevice    58.  6.101 / 58.  6.101
    
  libavfilter     7. 48.100 /  7. 48.100
    
  libswscale      5.  4.100 /  5.  4.100
    
  libswresample   3.  4.100 /  3.  4.100
    
  libpostproc    55.  4.100 / 55.  4.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002213366bb00] stream 0, timescale not set
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a':
    
  Metadata:
    
    major_brand     : M4A
    
    minor_version   : 512
    
    compatible_brands: isomiso2
    
    title           : &I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]
    
    artist          : Cider Party
    
    encoder         : Lavf58.18.104
    
    comment         : https://www.youtube.com/watch?v=HprdvIIpR-I
    
  Duration: 00:05:24.80, start: 0.000000, bitrate: 127 kb/s
    
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 120x90 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc
    
Input #1, image2, from './thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg':
    
  Duration: 00:00:00.04, start: 0.000000, bitrate: 1575 kb/s
    
    Stream #1:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 480x360 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
  Stream #1:0 -> #0:2 (mjpeg (native) -> png (native))
    
Press [q] to stop, [?] for help
    
[swscaler @ 00000221353d4fc0] deprecated pixel format used, make sure you did set range correctly
    
[ipod @ 00000221336703c0] Could not find tag for codec png in stream #2, codec not currently supported in container
    
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
    
Error initializing output stream 0:2 --
    
Conversion failed!

    Keep in mind that All of my thumbnails retrieved are .jpg

    Any suggestions ? Getting really desperate at this point...

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