Cf. comment. Restart the VT session when the APP goes from foreground to background and vice versa. --- libavcodec/videotoolboxenc.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c index 1060055ba5..ac847358ab 100644 --- a/libavcodec/videotoolboxenc.c +++ b/libavcodec/videotoolboxenc.c @@ -2175,8 +2175,27 @@ static int create_cv_pixel_buffer(AVCodecContext *avctx, #if TARGET_OS_IPHONE pix_buf_pool = VTCompressionSessionGetPixelBufferPool(vtctx->session); if (!pix_buf_pool) { - av_log(avctx, AV_LOG_ERROR, "Could not get pixel buffer pool.\n"); - return AVERROR_EXTERNAL; + /* On iOS, the VT session is invalidated when the APP switches from + * foreground to background and vice versa. Fetch the actual error code + * of the VT session to detect that case and restart the VT session + * accordingly. */ + OSStatus vtstatus; + + vtstatus = VTCompressionSessionPrepareToEncodeFrames(vtctx->session); + if (vtstatus == kVTInvalidSessionErr) { + CFRelease(vtctx->session); + vtctx->session = NULL; + status = vtenc_configure_encoder(avctx); + if (status == 0) + pix_buf_pool = VTCompressionSessionGetPixelBufferPool(vtctx->session); + } + if (!pix_buf_pool) { + av_log(avctx, AV_LOG_ERROR, "Could not get pixel buffer pool.\n"); + return AVERROR_EXTERNAL; + } + else + av_log(avctx, AV_LOG_WARNING, "VT session restarted because of a " + "kVTInvalidSessionErr error.\n"); } status = CVPixelBufferPoolCreatePixelBuffer(NULL, -- 2.17.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel