[FFmpeg-user] FFv1: newer ffmpeg builds create larger files?

[Peter B.]

On 06/18/2012 11:13 PM, Roger Pack wrote:
>> Absolutely.
>> Same resolution, same pix_fmt, same framerate.
>>
>> Here's a copy of ffprobe's output on both, the original and its
>> transcoded version:
>>
>> //-------------------------[Original]
>> Input #0, avi, from 'bsp-00001-100.avi':
>>  Metadata:
>>    IARL            : bsp-00001
>>    date            : 2012-03-11T02:49:06+01:00
>>    track           : 101 / 185
>>    encoder         : Lavf52.111.0
>>  Duration: 00:01:00.00, start: 0.000000, bitrate: 60324 kb/s
>>    Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p, 720x576, 25
>> tbr, 25 tbn, 25 tbc
>>    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2
>> channels, s16, 1536 kb/s
>>
>>
>> //-------------------------[Transcoded]
>> Input #0, avi, from 'bsp-00001-100-ffv1-yuv422p-l3_t8_s30-1_g01_c1_p2.avi':
>>  Metadata:
>>    IARL            : bsp-00001
>>    date            : 2012-03-11T02:49:06+01:00
>>    track           : 101 / 185
>>    encoder         : Lavf54.6.101
>>  Duration: 00:01:00.00, start: 0.000000, bitrate: 62267 kb/s
>>    Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p, 720x576, SAR
>> 16:15 DAR 4:3, 25 tbr, 25 tbn, 25 tbc
>>    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2
>> channels, s16, 1536 kb/s
> So I guess the question is what happened between  Lavf52.111.0 and
> Lavf54.6.101 (I assume this is FFV1 lossless)?
Yes it's ffv1 lossless.
I'll see if I can come up with a test using a self-built ffmpeg with
lavf52.111.0.

> Also why would they have differing bitrate's (or is this just an estimate)?
As far as I've "oberserved" this value during my work, I'd say it's
calculated like this: "filesize / duration".

Pb