<aaabbb>
all 251 frames in total (25fps). for comparision hevc (veryslow crf20 tune psnr) = 2.4mb. i'm surprised that a dedicated lossless codec performs worse than lzma
<furq>
what do you get with x264 -qp 0
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<aaabbb>
furq: 25mb
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<aaabbb>
so why is ffv1 producing worse compression than lzma? am i using it wrong? is it not effective at compressing low resolution or short videos?
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<aaabbb>
6
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<sirmangler>
Hi, I'm using libav and was hoping someone could advise me, I have a camera with only one video stream, I can decode it just fine but when I try to create a matroska container I'm getting "only audo, video, and subtitles are supported for matroska". I'm fairly sure the only thing is a video stream but if not, how could I ensure only the video stream is going to avformat?
<sirmangler>
thanks
<sirmangler>
I get this after doing avformat_new_stream then avformat_write_header, and I open my device in a fairly standard way (avformat_open_input, avformat_find_stream_info, avcodec_find_decoder, avcodec_alloc_context3, avcodec_parameters_to_context)
<sirmangler>
using ffplay shows only one video stream as well, so maybe this error is being caused by something else?
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<sirmangler>
I realised mkv and mp4 might not support mjpeg, so I tried a raw mjpeg file and I'm getting "mjpeg files have exactly one video stream", but when debugging I can see that "nb_streams" is 1, there's only one video stream, in the output context it shows the oformat is "raw MJPEG video"
<sirmangler>
Found the problem, you need to manually copy the stream information over with avcodec_parameters_copy
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<cristian_c>
I've found that minimal playback is working, so, I've to try recording and so I use avconv/ffmpeg to achieve that. There is a script to do that, I've just changed from avconv to ffpmeg command, and set pal in place of ntsc