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Sur d’autres sites (10192)
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swscale/aarch64 : add hscale specializations
26 mai 2022, par Swinney, Jonathanswscale/aarch64 : add hscale specializations
This patch adds code to support specializations of the hscale function
and adds a specialization for filterSize == 4.ff_hscale8to15_4_neon is a complete rewrite. Since the main bottleneck
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Signed-off-by : Martin Storsjö <martin@martin.st> -
Live stream doesn't seem to be passed to AWS correctly
12 août 2024, par NoobAmII'm trying to stream my live video into Amazon IVS and I don't see it on the live channels.


Is it possible I have a mistake in my FFMPEG configuration ?
I'm expecting to see this in my playback url or on the console screen for playback but I see nothing at the moment.


As I understand it, shouldn't I see some kind of playback in the live channels if a stream is being sent that channel ?


` async sendDataToIvs(channelArn: string, payload: any): Promise<void> {
 const injestServer = '***.global-contribute.live-video.net';
 const streamKey = 'sk_us-east-1_*****';
 
 const ffmpeg = spawn('ffmpeg', [
 '-re', // Read input at native frame rate
 '-i', '-', // Input from stdin (live stream data)
 '-r', '30', // Frame rate
 '-c:v', 'libx264', // Video codec - H.264
 '-pix_fmt', 'yuv420p', // Pixel format
 '-profile:v', 'main', // H.264 profile
 '-preset', 'veryfast', // Encoder quality setting
 '-x264opts', 'nal-hrd=cbr:no-scenecut', // Additional x264 options
 '-minrate', '3000', // Minimum bitrate
 '-maxrate', '3000', // Maximum bitrate
 '-g', '60', // GOP size
 '-c:a', 'aac', // Audio codec
 '-b:a', '160k', // Audio bitrate
 '-ac', '2', // Audio channels
 '-ar', '44100', // Audio sample rate
 '-f', 'flv', // Output format
 `rtmps://${injestServer}:443/app/${streamKey}` // Output destination
 ]);
 
 ffmpeg.stdin.write(payload, (err) => {
 console.log(payload)
 if (err) console.error('Error writing payload to FFmpeg stdin:', err);
 });
 
 ffmpeg.on('close', (code) => {
 console.log(`FFmpeg process exited with code ${code}`);
 });
 
 ffmpeg.stdin.on('error', (err) => {
 console.error('Error writing to FFmpeg stdin:', err);
 });
 
 ffmpeg.stderr.on('data', (data) => {
 console.error(`FFmpeg error: ${data}`);
 });
 } `
</void>

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Why does ffmpeg hang indefinitely when composing videos ?
11 octobre 2022, par Brendan HillI am executing ffmpeg commands in a Java microservice (which runs dockerised in kubernetes in a temporary pod created by KEDA from an Amazon SQS queue... but unlikely to be relevant).


About 30% of the time, the ffmpeg process hangs indefinitely :



/usr/local/bin/ffmpeg 
 -i /tmp/transcode-3b928f5f-3cd9-4cd6-9175-b7c1621aa7ce13592236077853079159/person1.mkv 
 -i /tmp/transcode-3b928f5f-3cd9-4cd6-9175-b7c1621aa7ce13592236077853079159/person2.mkv
 -filter_complex [0:v][1:v]hstack=inputs=2[v];[0:a]aresample=async=1000[0sync];[1:a]aresample=async=1000[1sync];[0sync][1sync]amix[a] 
 -map [v] 
 -map [a] 
 -c:v libx264 
 -crf 18 
 -ac 2 
 -vsync 1 
 -r 25 
 -shortest /tmp/transcode-3b928f5f-3cd9-4cd6-9175-b7c1621aa7ce13592236077853079159/composed.mp4



This causes the Java code to wait indefinitely :



 Process proc = Runtime.getRuntime().exec(cmd);

 StreamConsumer outConsumer = new StreamConsumer(proc.getInputStream(), stdout);
 StreamConsumer errConsumer = new StreamConsumer(proc.getErrorStream(), stderr);

 // execute data read/write in separate threads
 outExecutor.submit(outConsumer);
 errorExecutor.submit(errConsumer);

 proc.waitFor() // Hangs indefinitely, with ~30% probability



It is not specifically about the video files because they generally work on retry (with similar 30% failure probability so sometimes several retries are necessary). Of course, since it hangs indefinitely instead of exiting with failure, it has to wait hours before we risk another retry.


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Why is ffmpeg hanging indefinitely and how to fix ?


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Can I get ffmpeg to fail early instead of hanging indefinitely (so I can trigger retry immediately) ?


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I see many questions and posts about ffmpeg hanging indefinitely. Is ffmpeg inherently unstable ?










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