Ffmpeg decoding loop with additional FilterGraph

[Michal Borkowski]

Hello, 

I'm trying to use an AvFilter (to be able tu use yadif) in the ffmpeg decoding loop.

I managed to create a FilterGraph with yadif,  where I can send frames. 

But when I get the first frame from the AvFilter and call the frame ready callback with it I get an error I can't solve.

It looks like it's related to an access to the VideoFrameMetadata in the FFmpegVideoDecoder.

In attachments, you can find my decoding loop and here is the error I get : 

[36723:38755:0914/105148.322600:FATAL:values.cc(516)] Check failed: is_dict(). 0 libbase.dylib 0x00000001052febff base::debug::CollectStackTrace(void**, unsigned long) + 31 1 libbase.dylib 0x0000000104f9717b base::debug::StackTrace::StackTrace(unsigned long) + 75 2 libbase.dylib 0x0000000104f971fd base::debug::StackTrace::StackTrace(unsigned long) + 29 3 libbase.dylib 0x0000000104f971d8 base::debug::StackTrace::StackTrace() + 40 4 libbase.dylib 0x0000000104fe4897 logging::LogMessage::~LogMessage() + 183 5 libbase.dylib 0x0000000104fe3515 logging::LogMessage::~LogMessage() + 21 6 libbase.dylib 0x00000001052df4dc base::Value::SetKey(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&&, base::Value&&) + 188 7 libmedia.dylib 0x000000010eda0dea media::VideoFrameMetadata::SetBoolean(media::VideoFrameMetadata::Key, bool) + 90 8 libmedia.dylib 0x000000010efb6943 media::FFmpegVideoDecoder::OnNewFrame(AVFrame*) + 403 9 libmedia.dylib 0x000000010efb716b bool base::internal::FunctorTraits<bool (media::FFmpegVideoDecoder::*)(AVFrame*), void>::Invoke<bool (media::FFmpegVideoDecoder::*)(AVFrame*), media::FFmpegVideoDecoder*, AVFrame*>(bool (media::FFmpegVideoDecoder::*)(AVFrame*), media::FFmpegVideoDecoder*&&, AVFrame*&&) + 155 10 libmedia.dylib 0x000000010efb7046 bool base::internal::InvokeHelper<false, bool>::MakeItSo<bool (media::FFmpegVideoDecoder::* const&)(AVFrame*), media::FFmpegVideoDecoder*, AVFrame*>(bool (media::FFmpegVideoDecoder::* const&)(AVFrame*), media::FFmpegVideoDecoder*&&, AVFrame*&&) + 102 11 libmedia.dylib 0x000000010efb6fa5 bool base::internal::Invoker<base::internal::BindState<bool (media::FFmpegVideoDecoder::*)(AVFrame*), base::internal::UnretainedWrapper<media::FFmpegVideoDecoder> >, bool (AVFrame*)>::RunImpl<bool (media::FFmpegVideoDecoder::* const&)(AVFrame*), std::__1::tuple<base::internal::UnretainedWrapper<media::FFmpegVideoDecoder> > const&, 0ul>(bool (media::FFmpegVideoDecoder::* const&)(AVFrame*), std::__1::tuple<base::internal::UnretainedWrapper<media::FFmpegVideoDecoder> > const&, std::__1::integer_sequence<unsigned long, 0ul>, AVFrame*&&) + 101 12 libmedia.dylib 0x000000010efb6f0a base::internal::Invoker<base::internal::BindState<bool (media::FFmpegVideoDecoder::*)(AVFrame*), base::internal::UnretainedWrapper<media::FFmpegVideoDecoder> >, bool (AVFrame*)>::Run(base::internal::BindStateBase*, AVFrame*) + 106 13 libmedia.dylib 0x000000010f127101 base::RepeatingCallback<bool (AVFrame*)>::Run(AVFrame*) const & + 113 14 libmedia.dylib 0x000000010f126e70 media::FFmpegDecodingLoop::DecodePacket(AVPacket const*, base::RepeatingCallback<bool (AVFrame*)>) + 2528

I must have missed something related to the metadata.

Is there someone that can help me with this here, or tell me where can I ask for help ?

Thanks.

PS: I created a stackoverflow question : https://stackoverflow.com/questions/63881359/how-to-handle-metadatas-in-the-chromium-ffmpegdecodingloop-with-custom-avfilter 

[Dale Curtis]

chromium-dev => media-dev

Are you using the latest Chromium source code? We don't use a dictionary for metadata anymore.

- dale

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