I am a novice at ffmpeg and have recently taken over a code base built by a previous engineer. The FFmpeg code is on an app engine that will edit the videos when they are uploaded.

This code generated a title animation that will later be used as an overlay.

exports.generateTitleAnimation = function(metadata, destPath, options = {}) {
const peeqLogoPath = "/app/assets/peeq-logo.png";
const whiteBarMovPath = "/app/assets/whiteBar.mov";
const titleFontPath = "/app/assets/Sofia-Pro-Black.otf";
const dateStrFontPath = "/app/assets/Sofia-Pro-Medium.otf";
const outputDuration = 5.52;
const src01 = "color=c=white:s=1920x1080:duration=" + outputDuration;
const src02 = "[email protected]:s=1920x1080:r=120:duration=" + outputDuration;

var dateStrXOffset = "(92";
var filterComplexStr = "[1]";

if (metadata.title) {
    const title = metadata.title.toUpperCase();
    filterComplexStr += "drawtext=fontfile=" + titleFontPath + ":text='" + title + "':x='floor(92*(min((t-1.75)^29,0)+max((t-3.75)^29,0)+1))':y=622+30+2:fontsize=70:fontcolor=black:ft_load_flags=render,";
}
if (metadata.subTitle) {
    const subTitle = metadata.subTitle.toUpperCase();
    filterComplexStr += "drawtext=fontfile=" + titleFontPath + ":text='" + subTitle + "':x='floor(92*(min((t-2.0)^29,0.0)+max((t-3.8)^29,0.0)+1.0))':y=622+184-20-60+9:fontsize=46:fontcolor=black:ft_load_flags=render,";

    dateStrXOffset += "+30*" + (subTitle.length + 1);
}
if (metadata.dateStr) {
    filterComplexStr += "drawtext=fontfile=" + dateStrFontPath + ":text='" + metadata.dateStr + "':x='floor(" + dateStrXOffset + ")*(min((t-2.0)^29,0.0)+max((t-3.8)^29,0.0)+1.0))':y=622+184-20-60+9:fontsize=46:fontcolor=black:ft_load_flags=render,";
}
console.log("generateTitleAnimation generating")
filterComplexStr += "split=10[t01][t02][t03][t04][t05][t06][t07][t08][t09][t10];[t02]setpts=PTS+0.0166/TB[d02];[t03]setpts=PTS+0.033/TB[d03];[t04]setpts=PTS+0.05/TB[d04];[t05]setpts=PTS+0.0666/TB[d05];[t06]setpts=PTS+0.083/TB[d06];[t07]setpts=PTS+0.1/TB[d07];[t08]setpts=PTS+0.1166/TB[d08];[t09]setpts=PTS+0.133/TB[d09];[t10]setpts=PTS+0.15/TB[d10];[d10][d09]blend=average,[d08]blend=darken,[d07]blend=average,[d06]blend=darken,[d05]blend=average,[d04]blend=darken,[d03]blend= average,[d02]blend=darken,[t01]blend=average,colorkey=white:0.2:0.0,perspective=y1=W*0.176327:y3=H+W*0.176327[text01];[2][3]overlay=x=(W-w)*0.5:y=(H-h)*0.5:enable='between(t,0,3.0)'[logo01];[logo01][text01]overlay[outv]";

var args = ["-y", "-f", "lavfi", "-i", src01, "-f", "lavfi", "-i", src02, "-i", whiteBarMovPath, "-i", peeqLogoPath, "-filter_plex", filterComplexStr, "-vcodec", "qtrle", "-crf:v", "28", "-codec:a", "aac", "-ac", "2", "-ar", "44100", "-ab", "128k", "-map", "[outv]", destPath];

//console.log("args", args);
return childProcess.spawn('ffmpeg', args).then((ffResult) => {
    return destPath;
}, (err) => {
    //console.error(new Error("generateTitleAnimation:" + err));
    console.error(err);
    return Promise.reject(err);
});};

destPath is a .mov file

Up till a few days ago, the backend started throwing up this error

stderr: 'ffmpeg version 3.4.2-1~16.04.york0.2 Copyright (c) 2000-2018
 the FFmpeg developers\n built with gcc 5.4.0 (Ubuntu 5.4.0-
6ubuntu1~16.04.9) 20160609\n configuration: --prefix=/usr --extra-
version=\'1~16.04.york0.2\' --toolchain=hardened --
libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --
enable-gpl --disable-stripping --enable-avresample --enable-avisynth --
enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --
enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --
enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-
libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --
enable-librubberband --enable-librsvg --enable-libshine --enable-
libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-
libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --
enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 -
-enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-
openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --
enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-
libopencv --enable-libx264 --enable-shared\n libavutil 55. 78.100 / 55.
 78.100\n libavcodec 57.107.100 / 57.107.100\n libavformat 57. 83.100 /
 57. 83.100\n libavdevice 57. 10.100 / 57. 10.100\n libavfilter 
6.107.100 / 6.107.100\n libavresample 3. 7. 0 / 3. 7. 0\n libswscale 4.
 8.100 / 4. 8.100\n libswresample 2. 9.100 / 2. 9.100\n libpostproc 54.
 7.100 / 54. 7.100\nInput #0, lavfi, from 
\'color=c=white:s=1920x1080:duration=5.52\':\n Duration: N/A, start: 
0.000000, bitrate: N/A\n Stream #0:0: Video: rawvideo (I420 / 
0x30323449), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25
 tbc\nInput #1, lavfi, from 
\'[email protected]:s=1920x1080:r=120:duration=5.52\':\n Duration: N/A,
 start: 0.000000, bitrate: N/A\n Stream #1:0: Video: rawvideo (I420 /
 0x30323449), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 120 fps, 120 tbr,
 120 tbn, 120 tbc\nInput #2, mov,mp4,m4a,3gp,3g2,mj2, from 
\'/app/assets/whiteBar.mov\':\n Metadata:\n major_brand : qt \n 
minor_version : 537199360\n patible_brands: qt \n creation_time : 
2018-04-27T15:55:18.000000Z\n Duration: 00:00:05.52, start: 0.000000, 
bitrate: 54847 kb/s\n Stream #2:0(eng): Video: qtrle (rle / 
0x20656C72), bgra(progressive), 1920x1080, 53326 kb/s, SAR 1:1 DAR 16:9, 60 
fps, 60 tbr, 60 tbn, 60 tbc (default)\n Metadata:\n creation_time : 
2018-04-27T15:55:18.000000Z\n handler_name : Apple Alias Data Handler\n
 encoder : Animation\n timecode : 00:00:00:00\n Stream #2:1(eng): Data:
 none (tmcd / 0x64636D74), 0 kb/s (default)\n Metadata:\n creation_time
 : 2018-04-27T15:55:18.000000Z\n handler_name : Apple Alias Data
 Handler\n timecode : 00:00:00:00\nInput #3, png_pipe, from 
\'/app/assets/peeq-logo.png\':\n Duration: N/A, bitrate: N/A\n Stream 
#3:0: Video: png, rgba(pc), 452x207 [SAR 2834:2834 DAR 452:207], 25 
tbr, 25 tbn, 25 tbc\nCodec AVOption crf (Select the quality for 
constant quality mode) specified for output file #0 (/tmp/972967.mov) 
has not been used for any stream. The most likely reason is either 
wrong type (e.g. a video option with no video streams) or that it is a 
private option of some encoder which was not actually used for any 
stream.\nCodec AVOption b (set bitrate (in bits/s)) specified for 
output file #0 (/tmp/972967.mov) has not been used for any stream. The 
most likely reason is either wrong type (e.g. a video option with no 
video streams) or that it is a private option of some encoder which was 
not actually used for any stream.\nStream mapping:\n Stream #1:0 
(rawvideo) -> drawtext\n Stream #2:0 (qtrle) -> overlay:main\n Stream 
#3:0 (png) -> overlay:overlay\n overlay -> Stream #0:0 (qtrle)\nPress 
[q] to stop, [?] for help\n[swscaler @ 0x56080b828180] No accelerated 
colorspace conversion found from yuv420p to argb.\n[swscaler @ 
0x56080b8b5f40] No accelerated colorspace conversion found from yuva420p to argb.\n',

However, this error only occurs on the app engine. Running nom test on my Mac generates the title perfectly.

I am a novice at ffmpeg and have recently taken over a code base built by a previous engineer. The FFmpeg code is on an app engine that will edit the videos when they are uploaded.

This code generated a title animation that will later be used as an overlay.

exports.generateTitleAnimation = function(metadata, destPath, options = {}) {
const peeqLogoPath = "/app/assets/peeq-logo.png";
const whiteBarMovPath = "/app/assets/whiteBar.mov";
const titleFontPath = "/app/assets/Sofia-Pro-Black.otf";
const dateStrFontPath = "/app/assets/Sofia-Pro-Medium.otf";
const outputDuration = 5.52;
const src01 = "color=c=white:s=1920x1080:duration=" + outputDuration;
const src02 = "[email protected]:s=1920x1080:r=120:duration=" + outputDuration;

var dateStrXOffset = "(92";
var filterComplexStr = "[1]";

if (metadata.title) {
    const title = metadata.title.toUpperCase();
    filterComplexStr += "drawtext=fontfile=" + titleFontPath + ":text='" + title + "':x='floor(92*(min((t-1.75)^29,0)+max((t-3.75)^29,0)+1))':y=622+30+2:fontsize=70:fontcolor=black:ft_load_flags=render,";
}
if (metadata.subTitle) {
    const subTitle = metadata.subTitle.toUpperCase();
    filterComplexStr += "drawtext=fontfile=" + titleFontPath + ":text='" + subTitle + "':x='floor(92*(min((t-2.0)^29,0.0)+max((t-3.8)^29,0.0)+1.0))':y=622+184-20-60+9:fontsize=46:fontcolor=black:ft_load_flags=render,";

    dateStrXOffset += "+30*" + (subTitle.length + 1);
}
if (metadata.dateStr) {
    filterComplexStr += "drawtext=fontfile=" + dateStrFontPath + ":text='" + metadata.dateStr + "':x='floor(" + dateStrXOffset + ")*(min((t-2.0)^29,0.0)+max((t-3.8)^29,0.0)+1.0))':y=622+184-20-60+9:fontsize=46:fontcolor=black:ft_load_flags=render,";
}
console.log("generateTitleAnimation generating")
filterComplexStr += "split=10[t01][t02][t03][t04][t05][t06][t07][t08][t09][t10];[t02]setpts=PTS+0.0166/TB[d02];[t03]setpts=PTS+0.033/TB[d03];[t04]setpts=PTS+0.05/TB[d04];[t05]setpts=PTS+0.0666/TB[d05];[t06]setpts=PTS+0.083/TB[d06];[t07]setpts=PTS+0.1/TB[d07];[t08]setpts=PTS+0.1166/TB[d08];[t09]setpts=PTS+0.133/TB[d09];[t10]setpts=PTS+0.15/TB[d10];[d10][d09]blend=average,[d08]blend=darken,[d07]blend=average,[d06]blend=darken,[d05]blend=average,[d04]blend=darken,[d03]blend= average,[d02]blend=darken,[t01]blend=average,colorkey=white:0.2:0.0,perspective=y1=W*0.176327:y3=H+W*0.176327[text01];[2][3]overlay=x=(W-w)*0.5:y=(H-h)*0.5:enable='between(t,0,3.0)'[logo01];[logo01][text01]overlay[outv]";

var args = ["-y", "-f", "lavfi", "-i", src01, "-f", "lavfi", "-i", src02, "-i", whiteBarMovPath, "-i", peeqLogoPath, "-filter_plex", filterComplexStr, "-vcodec", "qtrle", "-crf:v", "28", "-codec:a", "aac", "-ac", "2", "-ar", "44100", "-ab", "128k", "-map", "[outv]", destPath];

//console.log("args", args);
return childProcess.spawn('ffmpeg', args).then((ffResult) => {
    return destPath;
}, (err) => {
    //console.error(new Error("generateTitleAnimation:" + err));
    console.error(err);
    return Promise.reject(err);
});};

destPath is a .mov file

Up till a few days ago, the backend started throwing up this error

stderr: 'ffmpeg version 3.4.2-1~16.04.york0.2 Copyright (c) 2000-2018
 the FFmpeg developers\n built with gcc 5.4.0 (Ubuntu 5.4.0-
6ubuntu1~16.04.9) 20160609\n configuration: --prefix=/usr --extra-
version=\'1~16.04.york0.2\' --toolchain=hardened --
libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --
enable-gpl --disable-stripping --enable-avresample --enable-avisynth --
enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --
enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --
enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-
libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --
enable-librubberband --enable-librsvg --enable-libshine --enable-
libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-
libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --
enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 -
-enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-
openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --
enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-
libopencv --enable-libx264 --enable-shared\n libavutil 55. 78.100 / 55.
 78.100\n libavcodec 57.107.100 / 57.107.100\n libavformat 57. 83.100 /
 57. 83.100\n libavdevice 57. 10.100 / 57. 10.100\n libavfilter 
6.107.100 / 6.107.100\n libavresample 3. 7. 0 / 3. 7. 0\n libswscale 4.
 8.100 / 4. 8.100\n libswresample 2. 9.100 / 2. 9.100\n libpostproc 54.
 7.100 / 54. 7.100\nInput #0, lavfi, from 
\'color=c=white:s=1920x1080:duration=5.52\':\n Duration: N/A, start: 
0.000000, bitrate: N/A\n Stream #0:0: Video: rawvideo (I420 / 
0x30323449), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25
 tbc\nInput #1, lavfi, from 
\'[email protected]:s=1920x1080:r=120:duration=5.52\':\n Duration: N/A,
 start: 0.000000, bitrate: N/A\n Stream #1:0: Video: rawvideo (I420 /
 0x30323449), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 120 fps, 120 tbr,
 120 tbn, 120 tbc\nInput #2, mov,mp4,m4a,3gp,3g2,mj2, from 
\'/app/assets/whiteBar.mov\':\n Metadata:\n major_brand : qt \n 
minor_version : 537199360\n patible_brands: qt \n creation_time : 
2018-04-27T15:55:18.000000Z\n Duration: 00:00:05.52, start: 0.000000, 
bitrate: 54847 kb/s\n Stream #2:0(eng): Video: qtrle (rle / 
0x20656C72), bgra(progressive), 1920x1080, 53326 kb/s, SAR 1:1 DAR 16:9, 60 
fps, 60 tbr, 60 tbn, 60 tbc (default)\n Metadata:\n creation_time : 
2018-04-27T15:55:18.000000Z\n handler_name : Apple Alias Data Handler\n
 encoder : Animation\n timecode : 00:00:00:00\n Stream #2:1(eng): Data:
 none (tmcd / 0x64636D74), 0 kb/s (default)\n Metadata:\n creation_time
 : 2018-04-27T15:55:18.000000Z\n handler_name : Apple Alias Data
 Handler\n timecode : 00:00:00:00\nInput #3, png_pipe, from 
\'/app/assets/peeq-logo.png\':\n Duration: N/A, bitrate: N/A\n Stream 
#3:0: Video: png, rgba(pc), 452x207 [SAR 2834:2834 DAR 452:207], 25 
tbr, 25 tbn, 25 tbc\nCodec AVOption crf (Select the quality for 
constant quality mode) specified for output file #0 (/tmp/972967.mov) 
has not been used for any stream. The most likely reason is either 
wrong type (e.g. a video option with no video streams) or that it is a 
private option of some encoder which was not actually used for any 
stream.\nCodec AVOption b (set bitrate (in bits/s)) specified for 
output file #0 (/tmp/972967.mov) has not been used for any stream. The 
most likely reason is either wrong type (e.g. a video option with no 
video streams) or that it is a private option of some encoder which was 
not actually used for any stream.\nStream mapping:\n Stream #1:0 
(rawvideo) -> drawtext\n Stream #2:0 (qtrle) -> overlay:main\n Stream 
#3:0 (png) -> overlay:overlay\n overlay -> Stream #0:0 (qtrle)\nPress 
[q] to stop, [?] for help\n[swscaler @ 0x56080b828180] No accelerated 
colorspace conversion found from yuv420p to argb.\n[swscaler @ 
0x56080b8b5f40] No accelerated colorspace conversion found from yuva420p to argb.\n',

However, this error only occurs on the app engine. Running nom test on my Mac generates the title perfectly.

• javascript
• google-app-engine
• ffmpeg

• Lazyman guess is to update your ancient ffmpeg (I didn't try to duplicate the issue). – llogan Commented Jun 8, 2018 at 0:03
• 4 No accelerated colorspace conversion found from yuv420p to argb is a warning, not an error. All it means is that the code for this conversion is generic C rather than ASM using a dedicated instruction set By itself, it won't prevent the video from being processed, it'll be slower. By how much, depends on resolution. – Gyan Commented Jun 8, 2018 at 2:50
• so @gyan , ah, that is key information. I've been knocking myself out, assuming that the process failed at No accelerated colorspace conversion found.... I wonder if you could tell me, is there somewhere in the ... manual ?! ... that explains the warning, what you just said. Where would I look in the ffmpeg doco for such a thing? I'm using ffmpeg, piled in to iOS, as a curiosity. – Fattie Commented Dec 19, 2018 at 17:34
• 1 -vf super2xsai,scale=w=iw/2:h=ih/2 worked for me when I ran into this issue with ffmpeg version 4.2.2. More information can be found here: trac.ffmpeg/ticket/3831 – Matt Commented Jan 27, 2020 at 1:28

1 Answer 1

@matt that filter was downsampling the input because of iw/2 and ih/2.
Which means divide input scales into 2 for the filter output, then upsampled again using super2xsai which means multiply the output scales into 2. But yes it indeed removes the warning of colorspace conversion at the expense of downgraded quality.

I was trying all available hwaccels on my device and the speed was faster because of hardware encoding. The colorspace conversion will be handled by your software and the encoding will be on hardware.