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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (77)
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24 juin 2013, parExplications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
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Sur d’autres sites (15771)
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Using ffmpeg to scale app preview videos for the AppStore
1er décembre 2018, par Felipe FerriI’m generating an app preview video to send to the AppStore. Depending on the device type, the AppStore requires certain video resolutions.
I have a main video, with resolution 1920x1080, which I was able to upload.
I need to generate another video with the resolution 1920x886 for supporting 6.5" devices, so I used the following command to perform the scaling :
ffmpeg -i video_1920_1080.mp4 -vf scale=1920:886 -c:a copy video_1920_886.mp4
If I get the info for the generated video using ffmpeg -i I get the following result :
ffmpeg -i video_1920_886.mp4
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hittin_1920_886.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.83.100
Duration: 00:00:29.13, start: 0.000000, bitrate: 705 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x886 [SAR 443:540 DAR 16:9], 694 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
timecode : 00:00:10:20
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : TimeCodeHandler
timecode : 00:00:10:20Ok, so it seems the output video is in the correct 1920x886 resolution.
However, when I try to upload this video the AppStore complains that the video is in the incorrect resolution.
If I open the file properties window on macos, the following information appears for the same video :
And, if I open the same video on VLC, I can see the following info on the Media Info screen :
So :
- ffmpeg -i tells me the video is in the resolution 1920x886.
- macos file properties tells me the video is in the resolution 1575x886.
- VLC tells me the video has a Resolution of 1920x898 and a Display Resolution of 1920x886.
Why are there three different resolutions ? How can I change each one of them ? I suppose the appstoreconnect website expects the file properties resolution to be 1920x886. How can I change that ?
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ffmpeg - ffmpeg aws lamnda function error
30 novembre 2018, par Pramod GehlotI am getting error
Execution result : failed(logs)
DetailsThe area below shows the result returned by your function execution. Learn more about returning results from your function.
{
"errorMessage": "RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Process exited before completing request"
}Summary
Code SHA-256
ca50xloHl4xLOSWox2xidHxC1VHyNqwq3kECKraw7/c=
Request ID
eb7906af-f46d-11e8-ae3b-45487c02a68e
Duration
38.73 ms
Billed duration
100 ms
Resources configured
128 MB
Max memory used
19 MBLog output
The section below shows the logging calls in your code. These correspond to a single row within the CloudWatch log group corresponding to this Lambda function. Click here to view the CloudWatch log group.
START RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Version: $LATEST
2018-11-30T07:02:38.509Z eb7906af-f46d-11e8-ae3b-45487c02a68e TypeError: Cannot create property 'stack' on string 'Could not find ffmpeg executable, tried "/var/task/node_modules/@ffmpeg-installer/linux-x64/ffmpeg" and "/var/task/node_modules/@ffmpeg-installer/ffmpeg/node_modules/@ffmpeg-installer/linux-x64/ffmpeg"'
END RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e
REPORT RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Duration: 38.73 ms Billed Duration: 100 ms Memory Size: 128 MB Max Memory Used: 19 MB
RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Process exited before completing request -
FFmpeg : Audio Filter taking too long
29 novembre 2018, par Prashant_SarinI am using the code below to apply a volume filter in ffmpeg, but it is taking too long. A 5-minute audiofile filter takes 3 minutes. Can someone give advice on how I can speed it up.
My command is :
var command = "-i $audioPath -af volume=enable='between(t,5,10)+between(t,15,20)':volume=0.25:eval=frame $outputFile"
Logs are :
2018-11-29 16:58:22.487 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress - ---AudioVolume---- size= 1537kB time=00:01:40.41 bitrate= 125.4kbits/s speed=1.13x
2018-11-29 16:58:22.489 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- video:0kB audio:1518kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.260607%
2018-11-29 16:58:22.490 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- bench: utime=86.707s
2018-11-29 16:58:22.491 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- bench: maxrss=65792kB
2018-11-29 16:58:22.492 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- [aac @ 0xb1ce4400] Qavg: 17415.965
2018-11-29 16:58:22.493 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: AudioVolume success--------- -benchmark -threads 4 -i /storage/emulated/0/FFmpegTest/looped.m4a -af volume=enable='between(t,5,10)+between(t,15,20)':volume=0.25:eval=frame
/storage/emulated/0/FFmpegTest/filtered_audio.m4a