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• Exit FFMPEG when a line freezes

  21 juin 2021, par user15966041

  I have a ffmpeg bat file for retrieving streams through rtsp

  


  bat file

  


  ffmpeg -xerror -loglevel error -stimeout 1111111 -rtsp_transport tcp -v verbose -i "rtsp://admin:admin1234@10.8.0.14:81/cam/realmonitor?channel=1&subtype=1 "  -vf scale=1024:576 -vcodec libx264  -sc_threshold 0 -f hls    -hls_flags delete_segments    -hls_time 2  -segment_time 2 -hls_list_size 2 C:\Apache24\htdocs\smartmine\ipcam\video_1\stream.m3u8  




  


  The problem im facing is that, after ffmpeg had run for a few hours, the speed decreases and the processing of the video stops and stays on that single line.

  


  Is there any way to exit the ffmpeg when this is happening. I have tried a lot of methods, but none of them worked out. Thanks a lot

  


• FFmpeg does not exit even though processing has finished

  23 mars 2021, par LTR

  I'm starting ffmpeg.exe from C# on Windows. Then I send some frames for encoding via the stdin stream. When all frames have been sent, I close the stdin stream. This tells FFmpeg to exit. I have used this method in other projects before, and it has always worked before.

  


  In this case, it doesn't work. FFmpeg realizes the standard input stream has been closed, and finishes the output file. But then, the ffmpeg.exe process just remains open without exiting.

  


  What's wrong here ?

  


      [TestMethod]
    public void FfmpegNotReacting()
    {
        Size frameSize = new Size(854, 480);
        

        var ffmpegProcess = new Process();
        ffmpegProcess.StartInfo
             = new ProcessStartInfo("ffmpeg_64.exe")
             {
                 Arguments = $"-loglevel verbose -report -f rawvideo -vcodec rawvideo -pixel_format rgb32 -video_size {frameSize.Width}x{frameSize.Height} -r 30 -i pipe:0 -c:v libx264 -vf format=yuv420p -preset medium -y -crf 18 output.mp4",
                 RedirectStandardError = true,
                 RedirectStandardInput = true,
                 RedirectStandardOutput = true,
                 CreateNoWindow = true,
                 UseShellExecute = false
             };
        ffmpegProcess.Start();

        // Just add one empty frame
        int bytesPerFrame = frameSize.Width * frameSize.Height * 4;
        ffmpegProcess.StandardInput.BaseStream.Write(new byte[bytesPerFrame], 0, bytesPerFrame);

        ffmpegProcess.StandardInput.BaseStream.Close();

        ffmpegProcess.WaitForExit();

    }


  


  According to How to stop ffmpeg process after it has finished processing in C# ? ShellExecute=true might fix the problem. However, I can't do that here because I need ShellExecute in order to redirect StdInput.

  


  Here's the last couple of lines from the ffmpeg output (with some irrelevant messages removed) :

  


  [output stream 0:0 @ 000002632cf844c0] EOF on sink link output stream 0:0:default.
No more output streams to write to, finishing.
[libx264 @ 000002632cf79c20] frame=   0 QP=9.00 NAL=3 Slice:I Poc:0   I:1620 P:0    SKIP:0    size=125 bytes
frame=    1 fps=0.0 q=24.0 Lsize=       2kB time=00:00:00.03 bitrate= 387.4kbits/s speed=3.33x    
video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 98.280098%
Input file #0 (pipe:0):
  Input stream #0:0 (video): 1 packets read (1639680 bytes); 1 frames decoded; 
  Total: 1 packets (1639680 bytes) demuxed
Output file #0 (output.mp4):
  Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (814 bytes); 
  Total: 1 packets (814 bytes) muxed
1 frames successfully decoded, 0 decoding errors


  


• ffmpeg won't exit normally with SIGINT

  2 mars 2021, par ntstlkr

  I'm trying to record video with ffmpeg and all works fine when I call stopRecord() function inside timeout :

  


  frame=  147 fps= 18 q=-1.0 Lsize=     290kB time=00:00:09.91 bitrate= 239.8kbits/s speed=1.24x    
video:129kB audio:156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 
2.159774%
[aac @ 0x55e825dbdc40] 
Qavg: 241.892
Exiting normally, received signal 2.
SIGINT
Recording process exit, code: 255, signal: null
Recording stopped


  


  But ffmpeg process won't exit and stays alive when I call stopRecord() function on API request inside express router.

  


  // here I create child process and try to close it in timeout which works.
export async function startRecord(producers: any, router: any, folderName: string, fileName: string) {
const sdp = `v=0
o=- 0 0 IN IP4 127.0.0.1
s=-
c=IN IP4 127.0.0.1
t=0 0
m=audio ${ports[0]} RTP/AVPF 111
a=rtcp:${ports[0] + 1}
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10;useinbandfec=1
m=video ${ports[1]} RTP/AVPF 125
a=rtcp:${ports[1] + 1}
a=rtpmap:125 H264/90000
a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f`;

const cmdArgStr = [
    "-protocol_whitelist pipe,rtp,udp",
    "-fflags +genpts",
    "-f sdp",
    "-i pipe:0",
    "-map 0:a:0 -c:a aac",
    "-map 0:v:0 -c:v copy",
    "-f mp4 -strict experimental",
    `-y recording/${folderName}/${fileName}.mp4`,
].join(" ").trim();

let process = spawn('ffmpeg', cmdArgStr.split(/\s+/));

process.stdin.write(sdp);
process.stdin.end();

process.on("error", (err: string) => {
    console.log('error');
    console.error("Recording process error:", err);
});

process.on("exit", (code: string, signal: string) => {
    process.kill('SIGINT');
    console.log('SIGINT');
    console.log("Recording process exit, code: %d, signal: %s", code, signal);

    if (!signal || signal === "SIGINT") {


           console.log("Recording stopped");
        } else {
            console.warn(
                "Recording process didn't exit cleanly, output file might be corrupt"
            );
        }
    });

    process.stderr.on("data", (chunk: string) => {
        chunk
            .toString()
            .split(/\r?\n/g)
            .filter(Boolean)
            .forEach(async (line: any) => {
                console.log(line);
                if (line.startsWith("ffmpeg version")) {
                    for (const consumer of consumers) {
                        await consumer.resume();
                    }
                }
            });
    });

    // this works!!
    setTimeout(() => {
        stopRecord(process);
    }, 10000);


    return process;
}

// this not works!! I call this function externally inside express router on API request
export function stopRecord(process: any) {
    process.kill('SIGINT');
}


  


  Linux process stays alive when I call stopRecord() inside express router, but property "killed" of process marked as true. It's only works when I send "SIGKILL" inside express router. I need to exit normally, because ffmpeg needs to save mp4 metadata.

  


  So the general question is : Why stopRecord function works inside timeout even with "SIGINT" code, but it doesn't when I call this function externally inside express router. Only "SIGKILL" works when I call stopRecord() inside express router.

  


  Renaming my "process" field doesn't help.

  


  I really don't understand why the same function works different inside timeout and inside express router. And I very thankful for any advice !

  


  I'm using node, typescript and express.