[Libav-user] I/O Error on av_interleaved_write_frame for Audio track

[Reynolds Kosloskey]

On 8/25/2022 12:16 PM, Reynolds Kosloskey wrote:
>
> Hello all.
>
> I am working on a capture/encoder project.  I've gotten it to work 
> well enough, for the most part.
>
> If I record shorter segments, like in the 1-2 minute range, the output 
> files are fine.
>
> However, as the clip gets longer, it eventually starts hitting an I/O 
> Error (-5) when executing *av_interleaved_write_frame(format_context, 
> output_packet). *It never recovers from this, all writing to the file 
> stops, and attempting to close the file results in an unplayable file.
>
> This is the part of the code that writes audio frames, and also where 
> the error is detected:
>
> int Recorder::audioWriteFrame(void* ctx, AVFrame* frame) {
>     if (!decoding) return -1;
>     if (recording) {
>         frames_all++;
>         frames_audio++;
>         AVPacket* output_packet = av_packet_alloc();
>         int ret = avcodec_send_frame(audio_context, frame);
>         while (ret >= 0)
>         {
>             ret = avcodec_receive_packet(audio_context, output_packet);
>             if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
>                 break;
>             }
>             else if (ret < 0) {
>                 cout << "AUD-AVCRPX: ";
>                 cout << ret;
>                 break;
>             }
>             chrono::steady_clock::time_point now = 
> chrono::high_resolution_clock::now();
>             long long ms_elapsed = 
> chrono::duration_cast<chrono::microseconds>(now - rec_started).count();
>             ms_elapsed = av_rescale_q(ms_elapsed, 
> audio_context->time_base, audio_stream->time_base);
>             output_packet->pts = ms_elapsed;
>             output_packet->dts = ms_elapsed;
>             output_packet->stream_index = audio_stream->index;
>
> *            ret = av_interleaved_write_frame(format_context, 
> output_packet); **
> **            if (ret < 0) {**
> **                char* errmsg = new char[4096];**
> **                av_strerror(ret, errmsg, 4096);**
> **                cout << "audio av_interleaved_write_frame ERROR: ";**
> **                cout << errmsg;**
> **                cout << "\r\n";**
> **            }**
> **            ret = ret;*
>         }
>
>         av_packet_unref(output_packet);
>         av_packet_free(&output_packet);
>     }
>     return 0;
> }
>
>
> Any ideas why this is happening would be helpful.
>
> --Reynolds
>
If anyone else comes across this error, one thing to look at would be 
the size of the buffers you're using.  In my case, I had an audio 
decoding thread that I passed a buffer to *avio_alloc_context*. 
Increasing that buffer size seems to have gotten rid of the issue.
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