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Les tâches Cron régulières de la ferme
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Le super Cron (gestion_mutu_super_cron)
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Publier sur MédiaSpip
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avcodec/g2meet : Check if adjusted pixel was on the stack
9 septembre 2019, par Michael Niedermayeravcodec/g2meet : Check if adjusted pixel was on the stack
This basically checks if a pixel that was coded with prediction
and residual could have been stored using a previous case.
This avoids basically a string of 0 symbols stored in less than
50 bytes to hit a O(n²) codepath.Fixes : Timeout (too slow to wait -> immediately)
Fixes : 8668/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-4895946310680576Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc> -
Why ffmpeg launched on a google cloud function can throw "Error : Output stream error : Maximum call stack size exceeded" ?
15 décembre 2020, par Stepan ShilinI'm trying to process video files with ffmpeg running on google cloud functions. Video files are downloaded from a google file storage, processed in stream by fluent-ffmpeg and streamed to a new google storage file. It works on smaller files but throws an "Output stream error : Maximum call stack size exceeded" on larger files.



I tried running the code on a normal pc, and I haven't encountered this error, even with larger files.



These are the parameters I deploy the function with



gcloud functions deploy $FUNCTION_NAME --runtime nodejs8 --trigger-http --timeout=180 --memory 256



This is the code that processes video



function cutVideo({videoUrl, startTime, duration, dist}) {
 return ffmpeg(videoUrl)
 .outputOptions('-movflags frag_keyframe+empty_moov')
 .videoCodec('copy')
 .audioCodec('copy')
 .format('mp4')
 .setStartTime(startTime)
 .setDuration(duration);
}

const sectionStream = cutVideo({
 videoUrl,
 startTime,
 duration,
 dist: tempFilePath,
});

const outputStream = bucket.file(sectionPath)
.createWriteStream({
 metadata: {
 contentType: config.contentType,
 },
 public: true,
});



Actual error stack looks like this



Error: Output stream error: Maximum call stack size exceeded
 at Pumpify.<anonymous> (/srv/node_modules/fluent-ffmpeg/lib/processor.js:498:34)
 at emitOne (events.js:121:20)
 at Pumpify.emit (events.js:211:7)
 at Pumpify.Duplexify._destroy (/srv/node_modules/duplexify/index.js:191:15)
 at /srv/node_modules/duplexify/index.js:182:10
 at _combinedTickCallback (internal/process/next_tick.js:132:7)
 at process._tickDomainCallback (internal/process/next_tick.js:219:9)
 RangeError: Maximum call stack size exceeded
 at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:28:31)
 at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)
 at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)
 at value.map.v (/srv/node_modules/@google-cloud/projectify/build/src/index.js:30:32)
 at Array.map (<anonymous>)
 at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:30:23)
 at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)
 at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)
 at value.map.v (/srv/node_modules/@google-cloud/projectify/build/src/index.js:30:32)
 at Array.map (<anonymous>)
</anonymous></anonymous></anonymous>


What could cause this error on a google cloud function ?


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How to stack several videos using ffmpeg ?
13 juillet 2019, par JohnI have four cameras that are recording videos and wand to stack all videos into one video file. The final video must be a 2x2 grid.
THE HARD PART is that sometimes cameras are not recording simultaneously.
Here you can see one situation of how cameras are recording :
Camera 1 timeline: |recording....................................|
Camera 2 timeline: |stopped....|recording........................|
Camera 3 timeline: |recording.........|stopped....|recording.....|
Camera 4 timeline: |recording..................|stopped..........|Explanation :
- Camera 1 is recording all time.
- Camera 2 is starting recording later.
- Camera 3 is recording, then stopped a period of time, then again recording.
- Camera 4 is recording a period of time, then stopped.
In the final video I want to synchronize each video by timestamps.
If a camera is stopped a period of time then at its position must be a black portion.
How can I do this ?
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