[FFmpeg-user] Piping uncompressed from ffmpeg to ffplay

[John Pilgrim]

$ ffmpeg -ss 0 -lowres 1 -i video.mxf -i audio.mxf -f matroska -c:a copy -c:v rawvideo - | ffplay -

pulled the following error

[matroska @ 0x7fb16b000e00] Codec for stream 1 does not use global headers but container format requires global headers
[matroska @ 0x7fb16b000e00] Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or
If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)
/snip/
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

but

$ ffmpeg -ss 0 -lowres 1 -i video.mxf -i audio.mxf -f nut -c:a copy -c:v rawvideo - | ffplay -

seems to work well.


On Nov 17, 2015, at 10:44 AM, Paul B Mahol <onemda at gmail.com> wrote:

> On 11/17/15, John Pilgrim <lists at johnpilgrim.net> wrote:
>> I'm currently using the following command to play DCPs
>> ffmpeg -ss 0 -lowres 1 -i video.mxf -i audio.mxf -f matroska - | ffplay -
>> 
>> I notice that the video is being transcoded to h264:
>> Stream mapping:
>>  Stream #0:0 -> #0:0 (jpeg2000 (native) -> h264 (libx264))
>>  Stream #1:0 -> #0:1 (pcm_s24le (native) -> vorbis (libvorbis))
>> 
>> My Question: What would be a revision to this invocation to send
>> uncompressed (v210) video to ffplay instead of h264?
>> 
>> FWIW, I am not committed to using matroska as a container. Any container
>> that works is fine.
>> Also using rawvideo didn't seem to send the audio.
>> Lastly, this is on MacOS specifically.
>> 
> 
> Maybe this:
> 
> ffmpeg -ss 0 -lowres 1 -i video.mxf -i audio.mxf -f matroska -c:a flac
> -c:v rawvideo - | ffplay -
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