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• ffmpeg mp4 to hls vod with extract segment duration without re-encoding

  11 juillet 2021, par Jeremy

  Hello I have h264 mp4 files. What I want to do is convert it to hls without re-encoding. This can be achieve by :

  


  ffmpeg -i input.mp4 -c copy -force_key_frames "expr:gte(t,n_forced*4)" -hls_time 4 -hls_playlist_type vod -hls_segment_type mpegts vid.m3u8


  


  But this problem with this is that it doesn't create extract segment duration :

  


  $ for f in *.ts; do echo -n "$f,"; ffprobe -v error -show_entries format=duration -sexagesimal -of csv=p=0 "$f"; done
vid0.ts,0:00:04.837700
vid1.ts,0:00:05.587200
vid2.ts,0:00:06.006200
vid3.ts,0:00:01.368200
vid4.ts,0:00:02.693867


  


  I don't believe I can't insert keyframes without encoding.

  


  When I run :

  


  ffmpeg -i input.mp4 -codec:v libx264 -force_key_frames "expr:gte(t,n_forced*4)" -hls_time 4 -hls_playlist_type vod -hls_segment_type mpegts vid.m3u8


  


  its works but this is resource intensive as it re-encode the video.

  


  So I am looking for the best way to achieve this while using minimal resource as possible.

  


• NodeJS fluent-ffmpeg error : Output stream closed

  30 décembre 2020, par Japser36

  We are running a NodeJS server that does some audio processing. Specifically, we have audio data returned by google's text to speech API, which we have in the form of a Buffer.

  


  In our application, we have to send this audio data through FFMPEG to format it and extract audio duration. We do this by first converting it into a stream, piping it into ffmpeg, and then storing the data in an output buffer :

  


  const toWav = function (input: Buffer): Promise<buffer> {&#xA;    return new Promise((res, rej): void => {&#xA;        const bufs = [];&#xA;        const myReadable = new Readable();&#xA;        myReadable._read = (): void => {}; // we already have all data in memory, so no-op this function;&#xA;        myReadable.push(input); // stream all data in the buffer to the stream&#xA;        myReadable.push(null); // end the stream&#xA;        const output = ffmpeg(myReadable)&#xA;            .inputFormat(&#x27;mp3&#x27;)&#xA;            .toFormat(&#x27;wav&#x27;)&#xA;            .on(&#x27;start&#x27;, function (commandLine) {&#xA;                console.log(&#x27;SPAWNED ARG: &#x27; &#x2B; commandLine);&#xA;            })&#xA;            .on(&#x27;error&#x27;, (err: object): void => {&#xA;                console.error(&#x27;FFMPEG error on wav transform&#x27;);&#xA;                rej(err);&#xA;            })&#xA;            .on(&#x27;end&#x27;, (): void => {&#xA;                console.debug(&#x27;FFMPEG finished wav transform&#x27;);&#xA;                res(Buffer.concat(bufs));&#xA;            })&#xA;            .pipe();&#xA;        output.on(&#x27;data&#x27;, (d: object): void => {&#xA;            bufs.push(d);&#xA;        });&#xA;    });&#xA;};&#xA;</buffer>

  


  This code is one of our functions that does the formatting, that our data gets passed through. Most of the time, this code works fine, but sometimes an error is thrown :

  


  Looking up this error on google, I found an issue on the FFMPEG library we use, that seems to suggest that using an input and output stream just isn't recommended and doesn't work. Rather, one of the two needs to be a file resource.

  


  Some more about this error, it seems to happen consistently when it does happen, but it doesn't happen consistently overall. For me, I got this error every time the code ran, I went and took lunch, and when I came back it was gone.

  


  For us it is important that this error won't pop up randomly in production, so the question is, does anyone have any suggestions on how we can be the most certain this error won't happen ?

  


  For completeness in how this function is being invoked to result in the error in the screenshot, the structure of the code where the error is caught is like so :

  


  await Promise.all(
    myArray.map(async (item, idx) => {
        // ...
        const wavBuffer = await toWav(myBuffer); // toWav is invoked at this level
    })
)
.then(() => {/* ... */})
.catch((e) => {
    // ...
    logger.error('[LOOP CRASH] Error at main promise:', e);
    // ...
});


  


  Any help would be appreciated, thank you ! Please let me know if I can provide more details, though I cannot share a repo or full source code or anything since this is a private repo.

  


• AVPlayer won't play audio files from FFMPEG

  18 janvier 2021, par Marcus

  Before requesting audio data AVPlayer requests byte range 0-1 from FFMPEG.

  


  FFMPEG gives a 200 response, but AVPlayer requires a 206 response.

  


  This results in the request failing and audio can't be played.

  


  Expected behavior :
Play tracks when streaming through ffmpeg

  


  Current behavior : When trying to stream with ffmpeg we get "Operation Stopped"

  


  Sample FFMPEG command :

  


  ffmpeg -i "/path/to/audio/track.mp3" -vn -strict -2 -acodec pcm_u8 -f wav -listen 1 -seekable 1 http://localhost:8090/restream.wav


  


  Player Log :

  


  Error Domain=AVFoundationErrorDomain Code=-11850 "Operation Stopped" UserInfo={NSLocalizedFailureReason=The server is not correctly configured., NSLocalizedDescription=Operation Stopped, NSUnderlyingError=0x600003bcc4b0 {Error Domain=NSOSStatusErrorDomain Code=-12939 "(null)"}}
!av_interleaved_write_frame(): Broken pipe

!Connection to tcp://localhost:8090 failed: Connection refused

!Connection to tcp://localhost:8090 failed: Connection refused

!Connection to tcp://localhost:8090 failed: Connection refused

!Error writing trailer of http://localhost:8090/restream.wav: Broken pipe


  


  This error is defined by Apple as :

  


  +"The HTTP server sending the media resource is not configured as expected. This might mean that the server does not support byte range requests."


  


  And summarised nicely in this StackOverflow post :

  


  when AVPlayerItem receive a video URL , it do the following task:

    Send a bytes request HTTP Request, and range = 0 -1
    If the response code is 206 and return 1 bytes data, It do the 3th task, if not, AVErrorServerIncorrectlyConfigured error occurred.
    continue send other HTTP Request, to download segment of All duration. and the response of VideoData code must be 206

In my situation , when send range[0-1] HTTP request, the server side give me a 200 OK response, So error occurred.


  


  Network Log :

  


  GET /file.wav HTTP/1.1
Host: localhost:1234
X-Playback-Session-Id: F72F1139-6F4C-4A22-B334-407672045A86
Range: bytes=0-1
Accept: */*
User-Agent: AppleCoreMedia/1.0.0.18C61 (iPhone; U; CPU OS 14_3 like Mac OS X; en_us)
Accept-Language: en-us
Accept-Encoding: identity
Connection: keep-alive

HTTP/1.1 200 OK
Content-Type: application/octet-stream
Transfer-Encoding: chunked


  


  Reproduce using this sample app :

  


  This can also be reproduced using standard ffmpeg and adding URL to local or remote ffmpeg URL

  


  Can we solve this by making changes to FFMPEG or AVPlayer ?